Heal the Bay Blog

Category: River Report Card

Imagine L.A. Without …. Nelson Chabarria

12.04.2017 | Matt King

Nelson Chabarria always dreamed of being a chemist. Then life got in the way. With his Koreatown family needing help to make ends meet, Nelson had to hang up his lab coat and love of science after graduating from Los Angeles High in 2001. He took a job working in L.A.’s Garment District.

Some dreams die hard, but thanks to Heal the Bay, Nelson is back in the lab – testing water samples from the Los Angeles River for harmful pollution. Nelson and four classmates from Los Angeles Trade Technical College spent the summer working with Heal the Bay staff scientists to monitor newly opened recreational zones along the river.

The good news is that all of Nelson’s hard work has paid off. Because of his team’s monitoring, we demonstrated that popular recreational zones are riddled with bacteria that can make kayakers and swimmers sick. After we publicized the results, the city of Los Angeles launched a formal protocol for posting troubled areas of the River and notifying the public about potential threats.

Here Nelson, now 34, tells what the program means to him as an East L.A. native and how it has affected his life:

We were in the school library – finishing up some data entry. The River Report Card had been released a week prior and we were about to refresh it with the latest bacterial test results. Weeks and hours and sunburns went into the grades, and to make them publicly available was simply gratifying. This moment felt pretty cool.

I was born and raised here. I’ve seen this “river” as I crossed the bridge to and from East L.A. I always thought of it as a ditch that divided the city. I am glad I was wrong about this. The river has its own ecosystem and interested groups that are invested in it.

I started classes in LATTC to come out of it working with some sort of water filtration or conservation leaning career. I want to be able to contribute in some way to making sure my city is smart in how it treats and uses the water we receive.

I never gave storm drains a second thought while driving. The few times they took my attention was during heavy storms where they flooded – the pooled water splashing unlucky pedestrians as cars passed. Sometimes I was unlucky. Now I am aware of their function, their contribution to the way water is handled here, and the importance of NOT contaminating streets with trash or toxic waste.

On a personal note it was great to be featured in an LA Times newspaper article. I had explained the work to some family, but not all. I never expected to talk to a reporter about my background and the work I do in the river. Once the article was released it spread to people that were unaware of the work I was doing. The bombardment of questions, congratulations and support was one of the best feelings to come out of this program. I cannot thank Heal the Bay enough for making this possible.

My job was the same each week. I went out and collected water samples. The next day they were read and the data was collected and posted. Even though it was the same every week, each time was always filled with new experiences. The memories come both from the people we met on the river and the dynamics of our great team.

Heal the Bay’s internship program covered a wide range of public service opportunities in the water systems of Los Angeles. The idea, team and process meshed right in with what I am interested in. It is one of the main reasons why I decided on coming back into school during the summer!

Our work isn’t possible without the real passion, action and commitment from people like Nelson and you. Help us spark more positive change in our region, up and down the coast, and around the world.

Make a Year-End Gift to Heal the Bay

Photo of Nelson in the L.A. River. (Summer 2017)

Photo of Nelson in the L.A. River collecting samples and observing conditions, by LA Times. (Summer 2017)

Photo of Heal the Bay’s L.A. River water quality monitoring team in the LATTC lab discussing water test results. (Summer 2017)

LA River Report Card - Heal the Bay - Water Quality Monitoring Photo of Heal the Bay’s L.A. River water quality monitoring team. (Summer 2017)

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Advisory: Stay Out of L.A. River This Weekend

09.08.2017 | Heal the Bay

L.A. River Los Angeles News River Report Card Water Quality

Update (9/10/17): Bacteria levels remain very high in Sepulveda Basin. Most sites also exceed regulatory limits in Elysian Valley, although amounts of bacteria are lower than earlier this week. Based on these latest sampling results, we still recommend avoiding water contact with the L.A. River.

Heal the Bay is urging the general public to avoid the waters of the Los Angeles River this weekend because of alarmingly high levels of bacterial pollution.

Our staff scientists collect weekly water quality samples at four sites in the Sepulveda Basin and Elysian Valley, areas of the L.A. River that have become popular for kayaking, fishing and other recreational activities. The levels of bacteria are at the most worrying levels since Heal the Bay began monitoring L.A. River sites in 2015.

The results have a special urgency this weekend, as the fourth annual L.A. Boat Race is scheduled to take place at the Glendale Narrows (Elysian Valley). Dozens of kayakers are expected for the boat pageant and parade.

Samples taken on Sept. 6 in the Sepulveda Basin by the City of L.A. Sanitation Department showed very high levels of bacteria, well over accepted regulatory and health limits. The poor results are possibly related to runoff from recent thunderstorms and rains. A fish kill in the Balboa Boulevard area of the Basin has also likely degraded water quality. Low-oxygen levels, high turbidity and increased ammonia levels have been cited by city officials as contributing factors to the fish kill.

Additionally, Heal the Bay scientists and other monitoring groups recorded very high levels of bacteria on Sept. 1 and Sept. 4 in the Elysian Valley area. Rainstorms and poor upstream water quality likely led to the spike in such bacteria levels (the presence of which indicate an elevated risk for ear infections, respiratory illnesses and gastrointestinal illnesses for people who come in contact with the water).

Heal the Bay urges people to stay out of the water and to delay any planned kayaking trips until water quality results show marked improvement. Our staff scientists expect to get updated bacteria counts this weekend (please check our Twitter and Facebook pages on Sunday as we’ll be posting the results).

Unlike at the beach, there is not yet an official protocol for authorities to alert the general public or kayak outfitters when potentially dangerous levels of bacterial pollution are found at popular recreation zones at the L.A. River. The only way for the general public to know about potential threats to their health is to access water quality data on Heal the Bay’s River Report Card, which is updated weekly.

Heal the Bay looks forward to working with the City of Los Angeles and the L.A. County Department of Public Health to resolve jurisdictional conflicts about health oversight of the L.A. River. This effort should hopefully lead to formal protocol for proactively warning kayak operators and the general public as soon as they know bacteria levels exceed safety thresholds.

Every year thousands of people recreate in the L.A. River. In 2014, approximately 6,000 people utilized the recreation zones, according to the Mountains Recreation and Conservation Authority.

The L.A. River has been designated by state regulators as a bacteria-impaired waterbody. The Los Angeles Regional Water Quality Control Board has identified several conduits of bacteria to recreational zones along the river: urban runoff, leaks and flows from wastewater collection systems, illicit connections and failing septic systems. Bacteria sources include pets, horses and human waste.

Experiencing the L.A. River firsthand is an undeniable way to make a connection to a river that needs supporters and advocates; many Heal the Bay staff members and volunteers have kayaked the L.A. River over the years and will continue to do so. We also believe that the public has a right to know what the water quality of the river is and then to make an informed decision about how they want to experience the river.

If you are thinking about getting out on the water, please check out our FAQ about recreation and water quality issues along the L.A. River.

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Celebrating Labor Day at the River or the Beach?

09.01.2017 | James Alamillo

Beach Report Card Events L.A. River Los Angeles River Report Card Water Quality

Most people view Labor Day weekend as the last celebration of summer and a final opportunity to enjoy a relaxing water adventure either at the beach or the river. A last hurrah before settling into the fall season. With that in mind, now is a good time to deliver a friendly reminder about water quality when heading to your favorite beach or stream.

First – let’s remember the basic safety tips.

These are some general rules to follow to lower your risk of getting sick when:

Going to the beach

Swim at least 100 yards from piers and flowing storm drains.
Because of poor circulation, water quality at enclosed beaches and harbors is often poorer than at open beaches.
Wait at least 3 days after a rainstorm before diving into the water (and wait at least 5 days before swimming at beaches near storm drains).

Going to the river

Do not drink the water.
After water contact, rinse off with soap and water.
Be aware of your swimming conditions (funny smells, homeless encampments, nearby drainages, posted signs) before entering the water.

Second – knowledge is power.

Heal the Bay has two great, if not awesome, sources of water quality information regardless of whether you are going to the beach or the river. In addition to practicing safe swimming, water enthusiasts should visit Heal the Bay’s Beach Report Card to get the latest information on all California beach conditions. (We publish the Beach Report Card on a weekly basis for the whole year, so can stay informed if you plan on swimming in the ocean beyond Labor Day Weekend.)

If you plan to visit a swimming hole in Los Angeles County this coming weekend, then see our River Report Card to see updated water quality information about these swimming holes.

Our motto has always been, and always will be: KNOW BEFORE YOU GO!

Have a great Labor Day Weekend!

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Heal the Bay Launches “The River Report Card”

07.27.2017 | Heal the Bay

Los Angeles News River Report Card Water Quality

Today we begin publishing regular water quality grades for freshwater recreational zones across greater L.A. Staff scientist Dr. Katherine Pease explains why the work is so important, and some interesting people helping us do it.

Last summer, Heal the Bay released a landmark study of water quality that showed that bacterial pollution continues to plague the L.A. River on a chronic, long-term basis. Our scientific report demonstrated that increasingly popular recreation zones suffered from poor water quality, and posed health risks for the growing number of people fishing, swimming and kayaking its waters.

The findings were a cause for concern, but also served as an opportunity – given all the renewed interest about the L.A. River and a $1 billion revitalization plan for L.A.’s central water body.

Building on that study and our longtime work to protect public health by providing weekly water quality grades at California beaches, Heal the Bay this year committed to regular water quality monitoring in rivers throughout greater L.A.

Today, we take the wraps off our River Report Card, a new online tool that lets users check for harmful bacteria levels at nearly a dozen freshwater recreational zones, stretching from Malibu to Frogtown, from Encino to Atwater Village.

We began monitoring inland recreational areas in 2014, starting with swimming holes in the Santa Monica Mountains, and adding sites in the L.A. River in 2015. To make sure people could see whether these popular spots are clean and safe, we posted the test results online in a weekly blog.

With our expanded River Report Card, the public can use our online map to check out water-quality ratings (green, yellow, or red) at their favorite summer spot. We will update the grades twice a week, every Monday and Wednesday. The data come from bacteria testing by Heal the Bay staff, supplemented by testing by the City of Los Angeles and Council for Watershed Health as part of the Los Angeles River Watershed Monitoring Program (LARWMP).

Our report on the L.A. River water quality garnered quite a bit of attention last year, leading to improvements in public awareness about water quality issues in the River.

Among the positive changes:

The L.A. County Department of Public Health now has a webpage devoted to Fresh Water Swim Areas
Additional agencies now test at recreation sites in the L.A. River through the LARWMP program (Heal the Bay was previously the only group testing the Elysian Valley recreation sites)
L.A. City Sanitation has posted new signs along the L.A. River about water quality that Heal the Bay and L.A. County Department of Public Health recommended

In another positive development, Heal the Bay has recruited some local students to conduct this work.

Under an EPA grant, we’re partnering with Los Angeles Trade Technical College, a public community college in downtown Los Angeles. Five LATTC students have joined our field staff for the summer, to learn the science of water quality monitoring and the art of advocating for environmental protections – starting with the River in their own backyards.

The enthusiasm that these students bring to the River is contagious, and their varied backgrounds and experiences bring broad new perspectives to our watershed work. (You can read more about them here.) The training underscores Heal the Bay’s commitment to diversifying the ranks of environmental science and developing future leaders in our region.

We will highlight their voices and experiences over the rest of the summer through Heal the Bay’s blog and social media channels – check back often to hear what they have to say!

These students have been charged with an important task: identifying where pollution is entering the L.A. River. It’s an important question, not only for people along the banks of the River, but for ocean users as well. The vast majority of pollution at our beaches is carried there via rivermouths and stormdrain outfalls.

To pinpoint these nasty pollution sources, the LATTC students are biking along the L.A. River in the Elysian Valley to identify and sample flowing stormdrains.

Conducting this monitoring is fascinating – we get important data, and the opportunity to be up-close and personal with the River. Every week we see people using the river for recreational activities like fishing, wading and kayaking but also for basic human needs, such as bathing and washing clothes.

Areas with flowing water provide people and their dogs respite from the oppressive summer heat. They serve homeless encampments as a place to freshen up or bathe. They are also ground zero for the often-polluted urban runoff that harms people, habitat and wildlife in the rivers as well as downstream at the beach.

These are sobering observations, but there is good news too. More people are connecting with nature and discovering their own freshwater oases in urban L.A. And many inland locations have good water quality. Residents are working to protect these special places and keep them healthy and safe.

We encourage you to check back here often, explore your local water bodies, learn about water quality, and learn what you can do to improve the health of your watershed.

If you are thinking about getting out on the water, please check out our FAQ about recreation and water quality issues along the L.A. River.

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Freshwater Friday: Safe to Swim in Malibu Creek?

08.12.2016 | Heal the Bay

Malibu / Pacific Palisades River Report Card

For 2017 grades, please see our River Report Card.

Heal the Bay’s inaugural study of Los Angeles River microbial water quality that we published July 27, 2016 and last year’s study on swimming holes in the Santa Monica Mountains called for more readily available public water quality information. The public has a right to know about water quality conditions in these freshwater recreation areas so that they can make informed decisions on how to minimize the risk of getting sick.

We will be posting an update every Friday during the summer with water quality information from our weekly sampling of freshwater recreation sites in Los Angeles County.

Malibu Creek State Park – Number of Exceedances
Site Name	9/29/16	9/21/16	9/15/16	9/7/16	8/31/16	8/24/16	8/17/16	8/10/16	8/3/16
Rock Pool	0 out of 4 None of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml as was the geometric mean value for Enterococcus (below 30 MPN/100ml). Since June 15, 2016, we have documented exceedance rates (for single samples) of 20% for E. coli and 13% for Enterococcus at this site.	0 out of 4 None of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml as was the geometric mean value for Enterococcus (below 30 MPN/100ml). Since June 15, 2016, we have documented exceedance rates (for single samples) of 21% for E. coli and 14% for Enterococcus at this site.	0 out of 4 None of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml as was the geometric mean value for Enterococcus (below 30 MPN/100ml). Since June 15, 2016, we have documented exceedance rates (for single samples) of 23% for E. coli and 15% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 25% for E. coli and 17% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 27% for E. coli and 18% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. In contrast, both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 30% for E. coli and 20% for Enterococcus at this site.	1 out of 4 One of the four criteria exceeds the threshold values this week at Rock Pool site in Malibu Creek. For both E. coli and Enterococcus, the single sample values were under their respective thresholds. The geometric mean value for E. coli was under its threshold, while Enterococcus was over its threshold. Since June 15, 2016, we have documented exceedance rates (for single samples) of 33% for E. coli and 11% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. For both E. coli and Enterococcus, the single sample values were under their respective thresholds but the geometric mean values were over the thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 33% for E. coli and 12% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. For E. coli, the single sample and geometric mean values were over threshold values; the single sample Enterococcus value was under the threshold of 110 MPN/100ml but the geometric mean value was over the threshold value. Since June 15, 2016, we have documented exceedance rates (for single samples) of 43% for E. coli and 14% for Enterococcus at this site.
Las Virgenes Creek at the Bridge	1 out of 4 Only one of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 27% for E. coli and 53% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean value for E. coli was over the threshold of 126 MPN/100ml.The single sample Enterococcus value was over the threshold of 110 MPN/100ml and the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 29% for E. coli and 57% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean value for E. coli was over the threshold of 126 MPN/100ml.The single sample Enterococcus value was below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 31% for E. coli and 54% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean value for E. coli was over the threshold of 126 MPN/100ml.The single sample Enterococcus value was below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 33% for E. coli and 58% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample and geometric mean values for E. coli value were both over their respective thresholds of 235 MPN/100ml and 126 MPN/100ml. The single sample Enterococcus value was below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since June 15, 2016, we have documented exceedance rates (for single samples) of 36% for E. coli and 64% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml, while the geometric mean for E. coli was over 126 MPN/100ml. Both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 30% for E. coli and 70% for Enterococcus at this site.	4 out of 4 Four of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was above the threshold of 235 MPN/100ml, and the geometric mean for E. coli was over 126 MPN/100ml. Similarly, both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 33% for E. coli and 67% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean for E. coli was over 126 MPN/100ml, and both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 25% for E. coli and 62% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean for E. coli was over 126 MPN/100ml, and both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 29% for E. coli and 57% for Enterococcus at this site.

Los Angeles River – Number of Exceedances
Site Name	9/27/16	9/20/16	9/13/16	9/6/16	8/30/16	8/23/16
Steelhead Park, Elysian Valley	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 6% for E. coli and 61% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 6% for E. coli and 65% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 6% for E. coli and 69% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 7% for E. coli and 73% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. In contrast, both the single sample and geometric mean values for Enterococcus were over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 7% for E. coli and 79% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at the Steelhead Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. In contrast, both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since May 31, 2016, we have documented exceedance rates (for single samples) of 8% for E. coli and 77% for Enterococcus at this site.
Rattlesnake Park, Elysian Valley	3 out of 4 Three of the four criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample value for E. coli was below the threshold of 235 MPN/100ml, but the geometric mean for E. coli was over the threshold of 126 MPN/100ml. Both the single sample and geometric mean values for Enterococcus were also over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 50% for E. coli and 100% for Enterococcus at this site.	4 out of 4 All four of the criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample and geometric mean values for E. coli value were above the thresholds of 235 and 126 MPN/100ml, respectively. Both the single sample and geometric mean values for Enterococcus were also over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 53% for E. coli and 100% for Enterococcus at this site.	4 out of 4 All four of the criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample and geometric mean values for E. coli value were above the thresholds of 235 and 126 MPN/100ml, respectively. Both the single sample and geometric mean values for Enterococcus were also over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 50% for E. coli and 100% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, but the geometric mean for E. coli was over 126 MPN/100ml. Both the single sample and geometric mean values for Enterococcus were over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 47% for E. coli and 100% for Enterococcus at this site.	3 out of 4 Three of the four criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, but the geometric mean for E. coli was over 126 MPN/100ml. Both the single sample and geometric mean values for Enterococcus were over their respective thresholds (110 and 30 MPN/100ml). Since May 31, 2016, we have documented exceedance rates (for single samples) of 50% for E. coli and 100% for Enterococcus at this site.	4 out of 4 Four of the four criteria exceed the threshold values this week at the Rattlesnake Park site for the Los Angeles River. The single sample E. coli value was above the threshold of 235 MPN/100ml, and the geometric mean for E. coli was over 126 MPN/100ml. Similarly, both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since May 31, 2016, we have documented exceedance rates (for single samples) of 54% for E. coli and 100% for Enterococcus at this site.
Sepulveda Basin at Burbank Blvd.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 6% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 6% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 6% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 7% for Enterococcus at this site.	1 out of 4 Only one of the four criteria exceeds the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. The single sample Enterococcus value was also below the threshold of 110 MPN/100ml but the geometric mean value for Enterococcus was over the threshold of 30 MPN/100ml. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 7% for Enterococcus at this site.	2 out of 4 Two of the four criteria exceed the threshold values this week at the Sepulveda Basin site for the Los Angeles River. The single sample E. coli value was below the threshold of 235 MPN/100ml, and the geometric mean for E. coli was below 126 MPN/100ml. In contrast, both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since May 31, 2016, we have documented exceedance rates (for single samples) of 0% for E. coli and 8% for Enterococcus at this site.

We envision safe swimmable rivers and creeks throughout Los Angeles County. However, a number of recreational waterbodies are not regularly monitored or monitored at all. We know thousands of Angelenos use these aquatic resources.

As such, Heal the Bay would rather provide some information about the water quality they are immersing themselves into rather than no information. The idea is to prompt the user to ask questions about these waterbodies: What is the origin of the water? Can I get sick from it? What types of illnesses can I get? How do I get more information? Check out the answers to these questions and more in our FAQ and the joint statement on recreation in the L.A. River.

Malibu Creek State Park testing sites map

Heal the Bay has been monitoring water quality in streams and rivers since 1998 through our Stream Team program. In 2014 we initiated a pilot study to monitor human use and water quality at freshwater swimming spots in the Santa Monica Mountains, focusing on bacterial pollution and public health implications. We are currently in our third summer of monitoring water quality in those swimming locations. Given Heal the Bay’s 25-year history of informing and educating beachgoers about beach water quality through our Beach Report Card, assessing the water quality of the Los Angeles River recreation zones was a natural next step. We are now in our second season of monitoring for the L.A. River recreation zones.

The A-to-F grading system of the Beach Report Card took years of work to develop and fine-tune. We are only in the very early stages of thinking about an analogous River Report Card. But we want to start by making basic water quality information available to the public in a timely manner.

We will be providing weekly information about levels of fecal indicator bacteria at five sites. We will report on whether the sample from the current week exceeded limits set by the Regional Water Quality Control Board and US EPA and what the microbial water quality has been over the summer sampling season thus far.

We will report on two types of fecal indicator bacteria, or FIB: E. coli and Enterococcus. FIB, while not harmful themselves, indicate the possible presence of pathogenic bacteria, which have been found to cause ear infections, skin rashes, respiratory illnesses and gastrointestinal illness. High levels of FIB are particularly concerning in areas where people come in contact with water through activities like swimming, fishing, and kayaking.

Excuse us for getting technical in this next section, but we just want to be clear about what we are measuring and what constitutes an exceedance.

We compare bacteria levels measured at each site to water quality objectives from the Total Maximum Daily Loads (TMDL) for Bacteria in the Malibu Creek Watershed and the Los Angeles River Watershed as well as EPA’s 2012 Recreational Water Quality Criteria (RWQC)

The freshwater regulatory limit for E. coli is set in the TMDL at 235 MPN/100ml for a single sample and 126 MPN/100ml for the geometric mean. (A geometric mean is a type of average that results in a number that is not as heavily affected by very high or very low values).

We calculate geometric means from all samples over the last 30-day period (usually four or five samples). For Enterococcus, we used EPA’s statistical threshold value for an illness rate of 32/1,000 (the more protective rate), which is 110 MPN/100ml for a single sample and 30 MPN/100ml for the geometric mean in a fresh waterbody designated for recreation.

For each site, we will report on the number of criteria that exceeded four standards. A site can have 0-4 out of four exceedances. A sample exceeds if:

E. coli single sample > 235 MPN/100ml
E. coli geometric mean > 126 MPN/100ml
Enterococcus single sample is > 110 MPN/100ml
Enterococcus geometric mean is > 30 MPN/100ml

So, what does that all mean?

The greater the number and magnitude of exceedances at a site, the worse the water quality is, indicating a potentially increased risk of getting sick.

Deciding what to do with this information depends on the risk level you are comfortable with. Single sample values give you an indication of the most recent water quality, while geometric mean values give you an indication of the ambient water quality over the last 30 days.

However, it is important to note that the single sample gives information for the day on which the sample was taken and conditions can change throughout the week until the next sample is taken.

The thresholds that the US EPA and the RWQCB have put forth are based on epidemiological studies and risk. An increased risk of illness is not a guarantee that you will get sick. Certain activities are more risky when water quality is poor; for instance, swimming and submerging your head is more risky than wading; swimming is more risky than kayaking; kayaking is likely more risky than hiking (at least with regards to picking up a waterborne illness), and so on, with the risk dependent on how likely you are to ingest or contact water.

We recommend following these best practices to stay safe and healthy.

Swimming: In waters known to exceed bacterial limits, swimming is not recommended, particularly submerging one’s head. Elevated bacteria levels can occur at any time. Swimmers should use caution when entering the water by checking the latest water quality results, avoiding contact immediately after a rainfall, if they are immunocompromised, or if they have an open wound. If there is any water contact, then rise off with soap and water afterward.
Kayaking and Fishing: In waters that are known to exceed bacterial limits, people should limit water contact, especially avoiding hand-to-face water contact. Users should not enter the water with an open wound, if immunocompromised, or after a rainfall. If there is any water contact, then rinse off with soap and water afterward.

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Freshwater Friday: Safe to Swim in Malibu Creek?

08.05.2016 | Katherine Pease

Malibu / Pacific Palisades River Report Card

Aug, 5, 2016 — Staff scientist Katherine Pease launches our Freshwater Friday blog post, providing weekly updates on the latest bacterial exceedances at popular recreational zones

Heal the Bay’s inaugural study of Los Angeles River microbial water quality that we published last week and last year’s study on swimming holes in the Santa Monica Mountains called for more readily available public water quality information. The public has a right to know about water quality conditions in these freshwater recreation areas so that they can make informed decisions on how to minimize the risk of getting sick.

So beginning today with our Santa Monica Mountains sites, we will be posting a blog post every Friday during the summer with water quality information from our weekly sampling of freshwater recreation sites in Los Angeles County. (You can see this week’s findings at the bottom of this page, but first we want to explain our intent and methodology.)

As such, Heal the Bay would rather provide some information about the water quality they are immersing themselves into rather than no information. The idea is to prompt the user to ask questions about these waterbodies: What is the origin of the water? Can I get sick from it? What types of illnesses can I get? How do I get more information? We will be posting a Frequently Asked Questions document next week to help answer some of these questions.

Excuse us for getting technical in this next section, but we just want to be clear about what we are measuring and what constitutes an exceedance.

We compare bacteria levels measured at each site to water quality objectives from the Total Maximum Daily Loads (TMDL) for Bacteria in the Malibu Creek Watershed and EPA’s 2012 Recreational Water Quality Criteria (RWQC)

We calculate geometric means from all samples over the last 30-day period (usually four or five samples). For Enterococcus, we used EPA’s statistical threshold value (for an illness rate of 32/1,000 (the more protective rate), which is 110 MPN/100ml for a single sample and 30 MPN/100ml for the geometric mean in a fresh waterbody designated for recreation.

For each site, we will report on the number of criteria that exceeded four standards. A site can have 0-4 out of four exceedances. A sample exceeds if:

E. coli single sample > 235 MPN/100ml

E. coli geometric mean > 126 MPN/100ml

Enterococcus single sample is > 110 MPN/100ml

Enterococcus geometric mean is > 30 MPN/100ml

So, what does that all mean?

The greater the number and magnitude of exceedances at a site, the worse the water quality is, indicating a potentially increased risk of getting sick.

However, it is important to note that the single sample gives information for the day on which the sample was taken and conditions can change throughout the week until the next sample is taken.

We recommend following these best practices to stay safe and healthy.

Swimming: In waters known to exceed bacterial limits, swimming is not recommended, particularly submerging one’s head. Elevated bacteria levels can occur at any time. Swimmers should use caution when entering the water by checking the latest water quality results, avoiding contact immediately after a rainfall, if they are immunocompromised, or if they have an open wound. If there is any water contact, then rise off with soap and water afterward.
Kayaking and Fishing: In waters that are known to exceed bacterial limits, people should limit water contact, especially avoiding hand-to-face water contact. Users should not enter the water with an open wound, if immunocompromised, or after a rainfall. If there is any water contact, then rinse off with soap and water afterward.

Malibu Creek State Park

for the week ending August 3, 2016

1. Rock Pool: Three exceedances

Three of the four criteria exceed the threshold values this week at Rock Pool site in Malibu Creek. For E. coli, the single sample and geometric mean values were over threshold values; the single sample Enterococcus value was under the threshold of 110 MPN/100ml but the geometric mean value was over the threshold value. Since June 15, 2016, we have documented exceedance rates (for single samples) of 43% for E. coli and 14% for Enterococcus at this site.

2. Las Virgenes Creek at the bridge: Three exceedances

Three of the four criteria exceed the threshold values this week at Las Virgenes Creek at the bridge. The single sample E. coli value was below the threshold of 235 MPN/100ml but the geometric mean for E. coli was over 126 MPN/100ml, and both the single sample and geometric mean values for Enterococcus were over their respective thresholds. Since June 15, 2016, we have documented exceedance rates (for single samples) of 29% for E. coli and 57% for Enterococcus at this site.

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