Los Angeles, California – Residents in parts of Los Angeles are facing water advisories due to potential contamination from wildfires in the area. The advisory, issued by the Los Angeles Department of Water and Power, warns against using tap water for drinking, cooking, or bathing in certain neighborhoods near the Palisades Fire.

Wildfires in Southern California have raised concerns about the quality of drinking water as contaminants like benzene can seep into the water supply. Andrew Whelton, a civil engineering professor at Purdue University, emphasizes the risk of contamination after wildfires and the need for precautions to protect public health.

The presence of chemicals like benzene, linked to cancer, has been detected in drinking water following previous wildfire disasters in Santa Rosa and Paradise, California. Other volatile organic compounds can also contribute to water contamination, posing health risks to residents.

During wildfires, two main factors can lead to water contamination: the water source itself and the infrastructure that delivers the water. While reservoirs supplying Los Angeles may remain largely unaffected, the local water delivery system faces vulnerabilities due to damage from the fires.

Pressure drops in the water system during high demand situations, creating a vacuum effect that can pull contaminants like soot and air pollution back into the water supply. The compromised infrastructure, especially if made of plastic, can melt and contaminate the water, adding to the challenges of ensuring water safety.

Ensuring the safety of drinking water post-wildfires requires prompt action from utilities, such as flushing the water systems, conducting repeated testing, and transparent communication with the public. Awareness of potential chemical contamination, even if not visible or detectable by smell, is crucial for safeguarding public health.

As wildfires continue to pose risks to water quality in affected areas, communities must remain vigilant, follow guidance from local health officials, and actively engage in efforts to mitigate contamination and ensure the safety of their water supply.