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Certified Laboratories

Testing your well water

The thousands of wells that draw water from the county’s groundwater basins generally produce high quality drinking water. The water district’s hundreds of monitoring wells provide data about regional groundwater quality; however every property and well has unique features and conditions. The water district's Guide for the Private Well Owner has information on recommended testing for domestic wells, but in general: 

  • The water district recommends that domestic well owners test their well water annually for coliform bacteria, nitrate, and electrical conductivity.
  • Changes in the color, odor, or taste of your well water should also prompt water quality testing.

The laboratories listed below are located in Santa Clara or San Benito County and are certified by the California Department of Public Health (CDPH) to perform drinking water tests. Please contact the laboratory of interest for more information on services offered. For a complete list of certified laboratories, visit the California Department of Public Health, Environmental Laboratory Accreditation Program webpage.

Laboratory Laboratory Certification
Renewal Date
Accutest Laboratories - Northern California
2105 Lundy Avenue
San Jose, CA 95131
(408) 588-0200
Bolsa Analytical
2337 Technology Parkway, Suite K
Hollister, CA 95023
(831) 637-4590
CM Analytical, Inc.
6700 Brem Lane, #10
Gilroy, CA 95020
(408) 848-3619

1893 Concourse Drive
San Jose, CA 95131
(408) 943-1888

Santa Clara County Public Health Lab
2220 Moopark Avenue, 2nd Floor
San Jose, CA 95128
(408) 885-4272
Torrent Laboratory, Inc.
483 Sinclair Frontage Road
Milpitas, CA 95035
(408) 263-5258

Source: CA Department of Public Health (CDPH) website accessed January 2014 and communication with laboratory staff. The information provided is subject to change and may not be current. If you have questions about services offered by a specific laboratory, please contact the laboratory directly. For information on state certification for a laboratory, please call the CDPH at (510) 620-3155.