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Public comment period on the proposal to establish a specific regulatory level posing no significant risk for 4-methylimidazole and amend Title 27, California Code of Regulations, section 25705.

4-Methylimidazole (4-MEI) is listed effective January 7, 2011 as known to the state of California to cause cancer.

Draft public health goal (PHG) of 1 part per billion (ppb) for perchlorate in drinking water.

Metam potassium listed as known to the State to cause cancer effective December 31, 2010 via the Authoritative Bodies listing mechanism.

Indicators of Environmental Justice Impacts of Climate Change in California

OEHHA announces a second public comment period for the draft Public Health goal for hexavalent chromium in drinking water.

CalEPA and OEHHA released the report “Cumulative Impacts: Building a Scientific Foundation.” This report presents the first step in developing a screening methodology to evaluate the cumulative impacts of multiple sources of pollution in specific communities or geographic areas.

Revised draft public health goal (PHG) for hexavalent chromium in drinking water. This document revises an earlier draft issued in August 2009 that proposed a PHG of 0.06 ppb. The PHG will serve as guidance for the California Department of Public Health (CDPH) in developing the nation’s first drinking water standard specifically for chromium 6.

The PHG for styrene is established at 0.5 parts per billion (ppb), based on carcinogenic effects in mice, supported by genotoxic effects observed in humans and suggestive evidence of increased cancer in occupational studies.

The Scientific Review Panel on Toxic Air Contaminants met to review OEHHA's draft documents on the Use of the Toxicity Equivalency Factor (TEFWHO‑97 and TEFWHO‑05) Scheme for Estimating Toxicity of Mixtures of Dioxin-Like Chemicals and its proposed Reference Exposure Level for caprolactam.