LOS ANGELES, CA – The Palisades Fire may have been contained, but its environmental impact is only beginning to unfold. Alongside the devastation of homes, businesses, and infrastructure, experts warn that the long-term consequences on air, water, and soil could be severe. Toxic debris, chemical contamination, and the loss of vegetation in burned areas pose serious risks to ecosystems and public health, raising concerns about the region’s recovery.
According to Cal Fire, the Palisades Fire became one of the most destructive wildfires in U.S. history, burning more than 23,000 acres, destroying over 6,500 structures, and causing 11 deaths. Driven by unusually strong Santa Ana winds, the fire quickly spread through the Santa Monica Mountains toward densely populated areas, prompting a massive emergency response that included two CL-415 “Super Scooper” aircraft dropping seawater to slow its advance.
While aerial suppression was necessary to contain the flames, environmental experts note that the use of seawater could hinder soil recovery. Unlike fresh water, seawater introduces salt into the landscape, making it more difficult for plants to regrow and stabilize hillsides. Without vegetation to anchor the soil, erosion could become a significant problem, particularly as California enters its rainy season.
Toxic Debris and Water Contamination
Beyond the immediate destruction, the fire left behind a toxic mix of burned materials. Homes and vehicles contain chemicals and hazardous substances that, when burned, release harmful pollutants into the air and soil. Electronics, solar panels, and batteries contain heavy metals, while older homes built between 1930 and 1950 may still contain asbestos. As the first major storms of the season hit, these pollutants are at risk of being carried into storm drains, rivers, and ultimately, the ocean.
“It’s not just about obvious pollutants, heavy metals, man-made chemicals, carcinogens, and dioxins, but also the natural materials that wouldn’t normally erode if the land weren’t burned,” said Rebecca Shipe, an adjunct associate professor at UCLA’s Institute of the Environment and Sustainability. “They have the potential to affect all organisms, whether they’re in that water or in the sediments.”
Stormwater runoff is a particular concern in areas like Pacific Palisades, where many destroyed homes were located along the Pacific Coast Highway. Without vegetation to absorb rainfall, debris and ash from burned structures could flow directly into Santa Monica Bay, impacting marine life and human health.
“Clearly, there are possible effects on human health, recreational use, and our fisheries,” Shipe said. “Contaminants can move up the food chain over time, affecting digestion, reproduction, and immune function in marine organisms.” She pointed to studies following the 2018 Woolsey Fire, which found evidence of long-term contamination in local wildlife, including sea otters.
In response, Los Angeles Mayor Karen Bass issued an emergency order to activate Low Flow Diversion pump stations, which capture stormwater and redirect it to the sewer system before it reaches the ocean. While the move is intended to prevent fire-related contaminants from entering coastal waters, experts warn that it could create new problems.
“This could be good in theory, but we also need to protect our sewage infrastructure,” said Naomi Meurice, a water quality specialist at Heal the Bay. “If too much debris enters wastewater treatment plants, it could lead to a sewage spill, introducing another environmental hazard to the situation.”
Cleanup and Public Health Concerns
With cleanup efforts underway, officials are warning residents not to attempt debris removal without protective equipment. During a community town hall at Santa Monica College, representatives from the Environmental Protection Agency (EPA) and the Federal Emergency Management Agency (FEMA) stressed that fire debris contains hazardous materials that require specialized handling.
“The level of toxicity is so severe that residents should not begin clearing debris without proper safety gear,” officials said. Those looking to recover sentimental items from the ruins of their homes are advised to wear N95 masks and protective clothing to reduce exposure to harmful particles.
To mitigate erosion and limit the spread of toxic runoff, emergency crews are deploying straw wattles and bale dams—temporary barriers made of straw—to slow the movement of debris-laden water. However, experts say these measures offer only a short-term solution.
“There are things we can do in terms of erosion control once some of the cleanup has been done,” Meurice said. “But if heavy rain hits before those protections are in place, we could see widespread contamination.”
The Los Angeles County Department of Public Health has already issued an ocean water quality advisory for all county beaches following recent storms. Similar warnings are issued regularly after heavy rain, but officials note that this time, the situation is different. The combination of burned materials and stormwater runoff could introduce higher levels of pollutants into the ocean than usual.
“What we’ve experienced with these wildfires is unprecedented,” said Sunny Wang, Santa Monica’s Water Resources Manager. “This isn’t just a typical wildfire—it’s burned through urban areas. We’re dealing with industrial contaminants that we haven’t had to track before.”
Protecting Water Resources
Santa Monica’s Sustainable Water Infrastructure Project (SWIP), which treats and recycles stormwater, is being closely monitored for signs of contamination. The underground facility, located beneath the Civic Center parking lot, is designed to filter pollutants from urban runoff before the water is reused. However, Wang acknowledged that the system had already detected increased levels of contaminants following the fire.
“We were closely monitoring during the fires because a portion of our wastewater comes from the Palisades,” Wang said. “We did see elevated organic contaminants, and we took samples, but we won’t have results for a couple of weeks to determine the full impact.”
Despite concerns over contamination, Wang reassured Santa Monica residents that the city’s drinking water supply remains unaffected. “Our groundwater source is hundreds of feet deep, so it’s unlikely that these contaminants will reach it,” he said. “Most of the pollutants will be washed into the ocean before they have a chance to infiltrate groundwater.”
As the city works to recover from the Palisades Fire, officials are urging residents to take precautions. Cleanup efforts are expected to take months, and experts warn that environmental hazards could persist long after the flames have been extinguished.
“This fire was different from anything we’ve seen before,” Wang said. “It’s going to take time to fully understand the long-term impact.”
