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

Human Right to Water

OEHHA’s assessment framework and data tool related to drinking water quality, accessibility, and affordability

Reports, Notices, Documents

Dec 23, 2019: Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) in Drinking Water
PUBLIC HEALTH GOAL INITIATION WEBINAR: The Office of Environmental Health Hazard Assessment (OEHHA) is hosting a webinar on November 15, 2019, from 9:00 a.m. to 12:00 p.m. (PST), to provide the public with the opportunity to hear and ask questions about the toxicological and epidemiological data for evaluating the health risks of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in drinking water. PUBLIC HEALTH GOAL INITIATION NOTICE AND DATA CALL-IN: At the request of the State Water Resources Control Board (SWRCB), OEHHA is initiation the development of public health goals (PHGs) for PFOA and PFOS in drinking water. 
Nov 8, 2019: Announcement of Availability of a Second Public Review Draft Technical Support Document for Proposed Public Health Goals for Trihalomethanes in Drinking Water
 A Public Health Goal (PHG) is the level of a drinking water contaminant at which adverse health effects are not expected to occur from a lifetime of exposure. The technical support document presents the scientific information available on the toxicity for four trihalomethanes (THMs) and the calculation of the proposed PHGs.
Oct 14, 2019: The Human Right to Water in California
OEHHA announces the release of the draft report, Achieving the Human Right to Water in California: An Assessment of the State’s Community Water Systems. Comment period is extended to November 8, 2019. Schedule of public events: October 3, 2019: Public Webinar 1:00 pm – 2:30 pm; October 11, 2019: Academic Experts Workshop in Sacramento; October 17, 2019: Technical Forum in Sacramento; October 23, 2019: Community Workshop in Fresno; October 28, 2019: Community Workshop in Ontario.