Water (Quality and Treatment Plants)

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735-Other State Agencies


The Division of Drinking Water (DDW) regulates public water systems; oversees water recycling projects; permits water treatment devices; supports and promotes water system security; and performs a number of other functions. For more about DDW activities, click on a links below.

The Division of Financial Assistance provides funding opportunities for drinking water system improvements; provides support for small water systems and for improving technical, managerial, and financial (TMF) capacity; and certifies drinking water treatment and distribution operators.

Private domestic wells are not regulated by DDW; the GAMA Program has information pertinent to private domestic well water quality.

Street Address

State Water Resources Control Board

1001 I Street

Sacramento, CA 95814

Mailing Address

State Water Resources Control Board

P.O. Box 100 Sacramento, CA 95812-0100

Overnight Delivery (UPS, FedEx, etc.)

State Water Resources Control Board

1001 I Street Sacramento, CA 95814

(916) 449-5600

(916) 449-5656 Fax


Drinking Water Field Operations Branch

Directly regulates approximately 700 large and 2,900 small public water systems in California to assure delivery of safe drinking water to all consumers. Reviews public water system, issues permits, conducts surveillance and inspections, evaluates monitoring data and compliance with standards, initiates enforcement actions, overviews 35 county health departments which have been delegated primacy for regulating 5,000 small water systems, and provides assistance to local health departments, regional water quality control boards, and the California Department of Toxic Substances Control.



4925 Commerce Drive, Suite 120

Bakersfield, CA 93309

(661) 335-7315


1180 Eugenia Place, Suite 200

Carpinteria, CA 93013

(805) 566-1326

Fresno/Districts Merced and Visalia

265 W Bullard Avenue, Suite 101

Fresno, Ca 93704

(559) 447-3300


1 Lower Ragsdale, Bldg 1, Suite 120

Monterey, CA 93940

(831) 655-6939


364 Knollcrest Drive, Suite 110

Redding, CA 96002

(530) 224-4800

Sacramento Headquarters

P.O. Box 997413

Sacramento, CA 95899-4713

(916) 449-5600


8455 Jackson Road, Suite 120

Sacramento, CA 95826

(916) 449-5600

San Bernardino

Gov’t Center, 4th Floor

464 West 4th Street, Suite 437

San Bernardino, CA 92401

(909) 383-4328

San Diego

1350 Front Street, Room 2050

San Diego, CA 92101

(619) 525-4159

Santa Ana

605 W. Santa Ana Blvd., Room 325

Santa Ana, CA 92701

(714) 558-4410

Santa Clara and San Francisco

850 Marina Bay Parkway

bldg. P, Second Floor

Richmond, CA 94804-6403

Santa Barbara

1180 Eugenia Place, Suite 200

Carpinteria, CA 93013-2000

(805) 566-1326

(805) 745-8196 Fax

Santa Rosa

50 D Street, Suite 200

Santa Rosa, CA 95404

(707) 576-2145


31 East Channel Street, Room 270

Stockton, CA 95202

(209) 948-7696

See Also: Water Resources Control Board