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

Related Pages


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
David Barth
Water Resources Engineer
Groundwater Supply Assessment & Special Studies Section
3500 Industrial Blvd
West Sacramento, CA 95691
916-376-9613 (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
Michael Van Raalte
Groundwater Section
770 Fairmont Avenue, #102
Glendale, CA 91203
818-549-2307 (office)

DWR Headquarters

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

Well Completion Reports/OSWCR
Ben Brezing
Engineering Geologist
901 P Street
P.O. Box 942836
Sacramento, CA 94236