As many as two million water wells tap California’s groundwater, with approximately 7,000 to 15,000 new wells constructed each year. They range from hand-dug, shallow wells to carefully designed large -production wells drilled to great depths.

Groundwater supplies approximately 40 percent of California's total water supply in average water years, and in some regions of the state, up to 60 percent in dry years. To protect this invaluable resource, we must ensure that wells are properly constructed and destroyed at the end of their useful lives, so they do not serve as a pathway for contaminants.

We are responsible for developing minimum well standards for four types of wells, published as DWR Bulletin 74 and for serving as the state clearinghouse for Well Completion Reports.

Water Well Basics


For maps of regions and a list of counties that each office supports, see the Integrated Regional Water Management Technical Assistance page.

    Northern Region

    April Scholzen

    Water Resources Tech. II

    2440 Main Street

    Red Bluff, CA 96080

    530-529-7368 (office)

    530-529-7322 (fax)



    North Central Region

    Madeleine Blanc

    Water Resources Engineer

    Groundwater Supply & Special Studies Section

    3500 Industrial Blvd

    West Sacramento, CA 95691

    916-376-9614 (office)

    916-376-9676 (fax)



    South Central Region

    Chris Guevara

    Water Resources Tech. II

    3374 East Shields Avenue

    Fresno, CA 93726

    559-230-3356 (office)

    559-230-3301 (fax)



    Southern Region

    Christopher Dalessandro

    Watermaster Section

    770 Fairmont Avenue, #200

    Glendale, CA 91203

    818-549-2338 (office)



DWR Headquarters

Well Standards
Julie Haas
Senior Engineer, Water Resources
715 P Street
Sacramento CA 95814

Well Completion Reports/OSWCR
Juliana Spector
Engineering Geologist
715 P Street, 8th Floor
P.O. Box 942836
Sacramento, CA 94236-001