Multi-agency network in Los Angeles tracks post‑fire water, finds metals and turbidity spikes

Los Angeles — Following January’s wildfires in Los Angeles County, a coalition of state, local and nonprofit groups coordinated rapid post‑fire water and beach monitoring and documented short‑term rises in turbidity and metals in storm runoff and beach sand. The work combined field sampling, interagency review of thresholds and a public dashboard to help managers weigh public‑health and environmental risks.

The monitoring was carried out by a loose consortium of agencies and organizations led by the Los Angeles Regional Water Quality Control Board and coordinated in part by Southern California Coastal Water Research Project (SCCWRP), Heal the Bay, the State Water Board emergency management staff and public‑health partners. “We documented about 200 sites that are monitored in the areas directly or surrounding where the fire, broke out,” SCCWRP scientist Alvina DeQuinto told the council.

Why it matters: the monitoring helped local officials and public‑health agencies decide whether beaches should be closed, whether fish consumption guidance was needed and how recovery activities such as debris removal could proceed without making water quality worse. State staff said the work also supported expedited permitting needed to clear debris ahead of storms.

What agencies did: The Los Angeles Regional Water Board and county partners sampled ocean wave wash and storm drains at a dozen beach sites after rain events on Jan. 22, Feb. 6 and Feb. 18; the Board added additional samples after storms on March 13 and May 1 and contracted a laboratory to analyze chemistry from those samples. Analysts tested for metals, nutrients, polychlorinated biphenyls (PCBs), polycyclic aromatic…