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N-Nitrosodimethylamine (NDMA) in Drinking Water

Updated Hybrid Workshop Information

The Office of Environmental Health Hazard Assessment (OEHHA) is changing the date of the hybrid public workshop to January 24, 2025.

Location:

CalEPA Building
Klamath Room
1001 I Street
Sacramento, CA 95814

Time:

1:00 p.m. to 4:00 p.m. Pacific Time.

For more information, please see the updated announcement.

Proposed Updated Public Health Goal for N-Nitrosodimethylamine (NDMA) in Drinking Water

The Office of Environmental Health Hazard Assessment (OEHHA) is announcing a proposed updated Public Health Goal (PHG) for N-nitrosodimethylamine (NDMA) in drinking water, the availability of a draft technical support document, a 45-day public comment period, and a hybrid public workshop on January 20, 2025.

The comment period begins on December 06, 2024, and is scheduled to end on January 20, 2025. On January 20, 2025, OEHHA will host a public workshop on the draft technical document. Information on the workshop and comment period can be found in the notice below:

Initiation of Process to Update Public Health Goal for NDMA in Drinking Water and Data Call-In for Relevant Information

March 27, 2020

OEHHA announced the initiation of PHG updates and a data call-in for NDMA and 1,4-dioxane on March 27, 2020.

Background on the PHG Program

The Calderon-Sher California Safe Drinking Water Act of 1996 (Health and Safety Code section 116365), hereafter referred to as the Act, requires OEHHA to post a notice on its website when it initiates work to develop or update PHGs.  PHGs are concentrations of chemicals in drinking water that are not anticipated to produce adverse health effects.  OEHHA is required to consider potential adverse effects on members of sensitive subgroups of the population, including infants, children, pregnant women, the elderly, and individuals with a history of serious illness.

PHGs are nonregulatory in nature but are used as the health basis for SWRCB to establish the state's primary drinking water standards or MCLs.  At the initial posting of a draft document, OEHHA provides a 45-day public comment period.  OEHHA also conducts a public workshop to receive public comments and engage in dialogue with interested parties on the draft document.  An external scientific peer review is then conducted as required by Health and Safety Code section 116365(c)(3)(D).  OEHHA considers all relevant comments in the preparation of a revised draft, which is posted for a 30-day public comment period.  After consideration of any additional comments, the PHG is finalized and posted on the OEHHA website for public reference and for use by SWRCB in developing California MCLs.

All PHGs and their supporting documents are available on OEHHA's website.

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