County of Sonoma California

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Water Testing

Only water collected in a bottle provided by the lab will be tested. Bottles are available for pick up in the lobby at 3313 Chanate Road in Santa Rosa. We do not test for chemicals, metals, minerals, or Giardia.

Water specimens must be dropped off in person (Monday - Friday, 8:00 a.m. - 5:00 p.m.) along with a completed form. A fee of $29.00 (effective July 1, 2017) can be paid by cash, check or by most credit cards.

Results will be ready in approximately 24 hours.

Download Instructions

Colilert: Presence/Absence

For routine well water testing.

For the simultaneous detection and confirmation of total coliforms and E. coli.

Colilert: Quantitray

For well water testing requiring a Most Probable Number.

For the simultaneous detection, confirmation and enumeration of total coliforms and E. coli.

Lab Slip

Water Testing Lab Slip (pdf)

Multiple Water Samples Submission Form (pdf)

Shellfish Growing Waters Sample Submission Form (pdf)


For more information, please contact:
Public Health Regional Laboratory
3313 Chanate Road
Santa Rosa, CA 95404
Phone: (707) 565-4711
Fax: (707) 565-7839

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