OEHHA performs major risk assessment and hazard evaluation activities relating to chemical contaminants in drinking water. These activities include developing health advisories, Public Health Goals for chemical substances in drinking water, Notification Levels, and providing toxicological assistance for chemical monitoring activities for the drinking water supply. The program also provides education to the public and other governmental agencies on drinking water contamination and drinking water regulatory standards development.

Public Health Goals

Level of a chemical contaminant in drinking water that does not pose a significant risk to health


Legal notices for Public Health Goals and Notification Levels

Notification Levels

Health-based advisory levels for chemicals in drinking water


Reports focusing on water

Reports, Notices, Documents

Feb 7, 2019: Health Risk Information for Public Health Goal Exceedance Reports
This document contains health risk information on regulated drinking water contaminants to assist public water systems in preparing these reports. A PHG is the concentration of a contaminant in drinking water that poses no significant health risk if consumed for a lifetime. PHGs are developed and published by OEHHA (Health and Safety Code Section 116365) using current risk assessment principles, practices and methods.
Feb 1, 2019: The Human Right to Water in California
The draft report was released January 3 with a 30‑day public comment period that was scheduled to close on February 4, 2019.  OEHHA has received requests from the Association of California Water Agencies and the California Municipal Utilities Association seeking an extension of the comment period.  OEHHA hereby extends the public comment period until 5 p.m., Tuesday, February 19, 2019.