Water (Quality and Treatment Plants)

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735-Other State Agencies


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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

Consumer Resource & Referral Guide Consumer Resource & Referral Guide
Directory of State Agencies Directory of State Agencies
Directory of Federal Agencies Directory of Federal Agencies
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