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Source: https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/Recentregs.html

See all regulations and drinking water-related statutes in the Drinking Water Law Book Recently adopted drinking water regulations and policy handbooks.

Effective in 2026

Regulations for Onsite Treatment and Reuse of Nonpotable Water (SWRCB-DDW-22-001) - effective April 22, 2026

Effective in 2024

Deletion of Cross-Connection Control Regulations and Adoption of Cross-Connection Control Policy Handbook (SWRCB-DDW-24-100A) — effective November 6, 2024
Hexavalent Chromium MCL (SWRCB-DDW-21-003) — effective October 1, 2024
Direct Potable Reuse (SBDDW-23-001) — effective October 1, 2024
Cross-Connection Control (Policy Handbook) — effective July 1, 2024

Effective in 2023

Fees for Drinking Water Systems — effective October 19, 2023
Water Loss Performance Standards — effective April 1, 2023

Effective in 2022

Fees for Drinking Water Systems — effective November 28, 2022
Standard Method of Testing and Reporting of Microplastics in Drinking Water (Policy Handbook) — effective September 7, 2022
No-Regulatory Effect Changes (SWRCB-DDW-21-100B) — effective July 18, 2022
Reference Corrections (SWRCB-DDW-21-100A) — effective July 12, 2022

Effective in 2021

Fees for Drinking Water Systems — effective November 1, 2021
Perchlorate DLR (SBDDW-20-001) — effective July 1, 2021
Revised Total Coliform Rule (SBDDW-20-002) — effective July 1, 2021

Effective in 2019

Fees for Drinking Water Systems — effective October 24, 2019
Point of Use/Point of Entry Treatment Permanent Regulations (SWDDW-17-003) — effective March 22, 2019

Effective in 2018

Surface Water Augmentation (SWA) Regulations (SBDDW-16-02) — effective October 1, 2018

Effective in 2017

1,2,3-Trichloropropane MCL (SBDDW-17-001) — effective December 14, 2017
Fees for Drinking Water Systems — effective April 10, 2017

Effective in 2016

This regulation was sunset on December 31, 2017 * Point of Use/Point of Entry Treatment Emergency Regulations (PDF) (SBDDW-16-01) — effective April 1, 2016

Effective in 2014

This MCL was removed on September 11, 2017 * Hexavalent Chromium Maximum Contaminant Level (MCL) (DPH-11-005) — effective July 1, 2014. Follow this link for more information about the status of the MCL.

Groundwater Replenishment Using Recycled Water (DPH-14-003E) — effective June 18, 2014.

Effective in 2013

Long Term 1 and 2 Enhanced Surface Water Treatment Rules (DPH-09-014) — effective July 1, 2013.

Effective in 2012

Disinfectant Residual, Disinfection Byproducts, and Disinfection Byproduct Precursors (DPH-09-004) — effective June 21, 2012.

Effective in 2011

Point of Entry Treatment (DPH-10-011E) — effective September 22, 2011. See Effective in 2016, above.
Ground Water Rule (DPH-09-007) — effective August 18, 2011.

Effective in 2010

Point of Use Treatment (DPH-10-009E) — effective December 21, 2010. See Effective in 2016, above

Effective in 2009

Revision of Safe Drinking Water State Revolving Fund (DPH-06-009) — effective April 2, 2009. Safe Drinking Water Project Funding and its associated regulations have been repealed and replaced by the Drinking Water State Revolving Fund (DWSRF) Policy Handbook. More information about DWSRF is available from the Division of Financial Assistance.

Effective in 2008

Revision of the Arsenic MCL (DPH-04-017) — effective November 28, 2008.
WaterWorks Standards (R-14-03) — effective March 9, 2008.
Interim Enhanced Surface Water Treatment Rule (R-20-01) — effective January 12, 2008.

Effective in 2007

Primary Maximum Contaminant Level for Perchlorate (R-16-04) — effective October 18, 2007.

Effective in 2006

Secondary Maximum Contaminant Levels (R-21-03) — effective September 27, 2006.
Public Notification Requirements for Drinking Water Violations (R-59-01) — effective September 1, 2006.
Disinfectants and Disinfection Byproducts (R-62-00) — effective June 17, 2006.
Radionuclide Drinking Water Regulations (R-12-02) — effective June 11, 2006.

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Regulatory Development Unit Mailing Address:
P.O. Box 100
Sacramento, CA 95812-0100 Street Address:
1001 I Street
Sacramento, CA 95814 E-mail us at DDWRegUnit@waterboards.ca.gov. (Page last updated 4/23/26)

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Adopted Drinking Water-Related Regulations and Policy Handbooks