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The Office of Environmental Health Hazard Assessment (OEHHA) is announcing the release of the final report on the potential health risks associated with the use by athletes, referees, coaches and spectators of synthetic turf fields.

Fish advisory for Los Vaqueros Reservoir in Contra Costa County.

Questions and answers about the insecticide Thuricide® (BtK) used for Spongy Moth control

Questions and answers about the insecticide DiPel® Pro DF (BtK) used for Spongy Moth control

OEHHA has finalized a health-protective concentration for noncancer effects of hexavalent chromium (Cr(VI)) in drinking water, as part of the process of updating the Cr(VI) Public Health Goal.

OEHHA has submitted comments on US EPA’s Updated Draft Risk Calculation Memorandum for a revised Risk Evaluation for Formaldehyde under the Toxic Substances Control Act (TSCA).

If, when, and how a fisheries closure occurs following an oil spill notification.

Evaluation of seafood safety consumption following oil spills

Restrictions on 1,3-Dichloropropene (1,3-D) to protect occupational bystanders. New regulations, developed jointly and mutually by the California Department of Pesticide Regulation and the Office of Environmental Health Hazard Assessment, are effective January 1, 2026 to reduce the risk of 1,3-D exposure to occupational bystanders.

OEHHA may send letters to interested parties that assist in understanding Proposition 65 statutes and regulations, and their application.