Ash to Action: Heal the Bay’s Post-Fire Water Quality Investigation
UPDATE FEBRUARY 18, 2025
We expect results this week from Heal the Bay’s first round of expanded ocean-water quality testing.
In late January, Heal the Bay’s staff scientists began collecting ocean-water samples from 10 shoreline sites along the Bay to test for heavy metals, PCBs, asbestos, and other toxins. These harmful pollutants are flowing unchecked to the sea from recent heavy rains and other runoff from burn zones. We expect results from before and after the “first flush” storm during the week of February 17th and will post them here.
UPDATE JANUARY 14, 2025
We present the updated timeline detailing our recent water quality assessment activities in the coastal regions affected by the Palisades fire.
- January 24-25, 2025
- Heal the Bay conducted initial pre-rain water quality testing at 10 locations throughout Santa Monica Bay: five within the burn zone, three outside of the burn zone but within the beach advisory zones, and two control sites (one north and one south of the beach advisory zones).
- Our water quality scientists tested for temperature, turbidity, Fecal Indicator Bacteria, PAHs, PCBs, PFAS, benzene, mercury, and other heavy metals. This sampling involved coordination with the Fire Department and Lifeguards to gain access to the closed burn zone.
- January 28, 2025:
- After the January 26 rainstorm, staff took water quality samples again for the same pollutants and at the same locations tested on January 24-25, to compare pre- and post-rain results.
- Jenny Jay from UCLA joined us for the six northernmost sampling sites to test for metals, antibiotic-resistant bacteria, and nutrients.
- February 3, 2025:
- Heal the Bay staff examined the Beach Report Card on Friday, January 31, 2025, and identified data gaps within the burn zone.
- Staff went out on Monday, February 3, 2025, to sample the five locations within the burn zone for temperature, turbidity, and Fecal Indicator Bacteria (which we can process ourselves in our lab) to fill those data gaps.
- On this sample day, journalists from NPR and Spectrum News and the Fire Department’s photography team joined us to document and report on our testing.
- Heal the Bay staff attended the Post-Fire Coordinated Water Quality Testing Meeting hosted by SCCWRP. While this group aims to establish a working group to coordinate long-term post-fire water quality monitoring (which Heal the Bay will participate in), this meeting addressed urgent needs arising from the weather conditions by identifying who would be conducting sampling that week, where the sampling would occur, and which contaminants would be tested.
- February 10, 2025:
- Heal the Bay returned to the field one last time to support ongoing research, visiting six of our ten original sample sites, from Surfrider Beach at Malibu Lagoon to Will Rogers State Beach at Santa Monica Canyon.
- An assessment of the BRC on Friday, February 7, 2025, indicated no remaining data gaps, so we did not collect Fecal Indicator Bacteria samples.
- Instead, this trip was intended to gain access to the burn zone one more time and show our sampling locations to researchers from the Proteocean Lab at USC. They plan to build on our initial testing with weekly sampling for heavy metals, microbial health, and nutrients.
- Staff from Surfrider also joined us so that we could show them where there is safe access to their regular testing locations within the burn zone.
- We also collected sand samples at each site from below the high tide line and above the high tide line where the sand was dry (where possible). These samples have been delivered to CSU Northridge, where researchers will test them for heavy metals and PAHs. They will also compare the results from our sand samples to soil samples that they collected within the Eaton Fire burn zone.
UPDATE JANUARY 29, 2025
Our fire response has just begun.
Over the past six days, the Heal the Bay Science and Policy Team has been testing water in and out of the burn zones along Santa Monica Bay impacted by the Palisades Fire.
The Palisade Fire has increased sedimentation and introduced harmful pollutants into our coastal waters, and Heal the Bay is dedicated to understanding the impacts, which is why we are testing for key pollutants that may be transported into Santa Monica Bay due to runoff from the Palisade Fire.
Not only are we testing for bacteria and turbidity (which we can process in-house), but we are also collecting samples to test for Heavy metals, Mercury, PAHs/PCBs, Benzene, and PFOS/PFOA (two types of PFAS). We collected samples before and after the rain event on January 26, 2025, which will provide a comparative analysis of initial pollutant levels and stormwater runoff effects.
During a typical rain event, stormwater runoff is considered the most significant source of water pollution. Following the unprecedented wildfires in Los Angeles this past weekend, the “first flush” amplified the pollution – carrying not only higher levels of typical pollutants like oil and grease, trash, plastic, bacteria, and heavy metals but also wildfire debris and other hazardous materials including ash, fire suppressant, household chemicals, car batteries, and more. These contaminants pose significant risks to water quality, marine ecosystems, and public health.
The team collected water samples from 10 key locations, including areas within the burn zone, adjacent impacted areas, and control sites.
(NOTE: We were joined in the field by Professor Jennifer Jay of UCLA, and there may be additional data from agency offices like the LA County Department of Public Health, that will also contribute to the very limited water quality dataset for understanding the impacts of the Palisades Fire.)
Heal the Bay is one of only a few organizations doing this water quality testing in the wake of these devastating fires. Still, great science is collaborative, and our team is excited to be one of the only nonprofits contributing to this initial and limited data set. Every bit of data will help us understand the long-term impacts of this unprecedented fire season.
Our findings will be shared as soon as possible to inform the public about potential environmental and public health risks. We will also contribute to coordinated monitoring efforts that will inform policymakers and guide future mitigation and response efforts.
While our samples are being processed to help us understand what is in our coastal waters, we strongly urge everyone to avoid contact with ocean water and to refrain from walking on the beach, as fire debris runoff may contain toxic or carcinogenic chemicals. The LA County Department of Public Health has issued Ocean Water Closures from Las Flores State Beach to Santa Monica State Beach, with additional Beach Advisories issued as far north as Surfrider Beach at Malibu Lagoon and south to Dockweiler State Beach at World Way, all of which will remain in effect until further notice. Your health and safety are our top priority—thank you for doing your part to protect yourself and our environment.
There are so many people to thank for making this work happen, but we will start with a huge thanks to Dan Murphy of the LA Fire Department for helping coordinate access to the burn zone, Los Angeles County Lifeguards and to our Heal the Bay sampling team (Dr. Tania Pineda-Enriquez PhD, Annelisa Moe, Naomi Meurice, Zoë Collins, and Vicente Villaseñor).
Key Terms:
PAHs = polycyclic aromatic hydrocarbons, volatile organic compounds associated with oil/grease
PCBs = Polychlorinated biphenyls, chemicals used in industrial / commercial products (PCBs stopped being produced in the 70s, so a legacy chemical)
PFASs = Per- and polyfluoroalkyl substances, forever chemicals (manmade chemicals that do not breakdown ) used to make waterproof, nonstick, and flame-resistant products.