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Drinking Water Treatment & Distribution System Operators

In 1971, laws and regulations governing the certification of potable water treatment facility operation were enacted.   The regulations establish at what level these facilities should be manned, the minimum qualifications for testing at each of the five grade levels, and the criteria for the renewal and revocation of operator certificates.

In 1998, the United States Environmental Protection Agency (USEPA) established guidelines for the certification and re-certification of operators of community and non-transient non-community public water systems.  On January 1, 2001, new state regulations were adopted to comply with these guidelines and the existing water treatment operator certification program was modified accordingly.  The new regulations also established a water distribution operator certification program.  This program became the Drinking Water Operator Certification Program (DWOCP).

The DWOCP was originally under the Department of Health Services and then the California Department of Public Health.  In 2014, the DWOCP was transferred to the State Water Resources Control Board (SWRCB) in the Division of Financial Assistance. 

The DWOCP is responsible for the testing and certification of approximately 31,000 water treatment and water distribution operators throughout the state of California.

Drinking Water Operator Examination

Certified Water Treatment & Distribution Operators

The above lists are for checking an operator's current status.

Mailing lists are ONLY sent to water systems for recruitment purposes. If you are recruiting for your water system and would like an operator mailing list, please provide the system name and number in an e-mail request to Amy Chiang at amy.chiang@waterboards.ca.gov or call at 916-449-5618.

Contact Information

Drinking Water Operator Certification Program: (916) 449-5611 and (916) 449-5610      Email dwopcertprogram@waterboards.ca.gov

Mailing Address: 
State Water Resources Control Board
Drinking Water Operator Certification Program
PO Box 944212
Sacramento, CA  94244-2120

Physical Address / Overnight Delivery Address
State Water Resources Control Board
Drinking Water Operator Certification Program
1001 "I" Street, 17th Floor
Sacramento, CA  95814

Telephone:  (916) 449-5611
Fax:  (916) 449-5654