As wildfires continue to ravage Los Angeles, several utilities have issued warnings about the safety of drinking water until extensive testing can confirm its quality. The impact of a warmer, drier climate has exacerbated the severity of wildfires, leading them to encroach on urban areas with devastating consequences. Toxic chemicals from the fires can infiltrate damaged drinking water systems, rendering traditional filtering or boiling methods ineffective, according to experts.
Last week, Pasadena Water and Power took the precautionary measure of issuing a 'Do Not Drink' notice to a significant portion of its customers for the first time in its century-long history. Concerns arose due to the potential entry of toxic chemicals into the water pipes following the destruction caused by the fires.
Urban Fires and Drinking Water Risk
When fires occur in urban settings, the infrastructure is at high risk of damage. The aftermath of such fires can introduce ash, smoke, soot, and other harmful elements into the water piping network, as explained by water contamination expert Andrew Whelton from Purdue University.
The loss of pressure during fires can compromise water systems, allowing toxins to enter. Factors such as normal water demand, firefighting efforts, and power outages can contribute to this pressure loss, affecting both water quality and availability for firefighting purposes.
Health Risks and Contaminants
Experts warn that toxic chemicals in post-fire drinking water pose health risks ranging from temporary illnesses to long-term conditions like cancer. Even minimal levels of certain chemicals, such as benzene, a known carcinogen, can be concerning. The cumulative exposure to these chemicals over a lifetime is a significant factor in assessing health risks.
Testing for a range of volatile and semi-volatile organic compounds is crucial to ensure water safety post-fire incidents. While some utilities have issued warnings and begun testing for contaminants, the process of declaring water safe for consumption can be lengthy, lasting from weeks to months.
Future Precautions and Recommendations
As Los Angeles County grapples with the aftermath of fires, water service providers are prioritizing firefighting efforts and water quality testing. Residents are advised to follow guidance from their utility or local health department regarding safety precautions until the water is deemed safe for consumption.
It is recommended that individuals refrain from conducting expensive water testing at home until the public water system is declared safe. Professional testing post-utility confirmation is the most reliable method to determine if household pipes are contaminated.
The ongoing efforts to address drinking water contamination in fire-affected areas underscore the importance of proactive measures and comprehensive testing to safeguard public health.
