Official recovery information for Sonoma County fires: »

Ocean Water Quality

Sonoma County has approximately 64 miles of coastal beaches. Ocean water samples are collected at beaches that are visited by 50,000 people per year and are adjacent to storm drains, creek or rivers. Seven beaches in Sonoma County meet this criteria.

Environmental Health & Safety monitors bacterial levels by collecting and testing weekly water samples between April 1 and Oct 31.

Water Quality Test Results

Bacteriological Sampling for ocean beaches has ended for the season. Sampling will resume the week of Memorial Day 2018.

Test Results from Previous Years

State Standards

Total Coliform

10,000 per 100 ml

Escherichia coli

400 per 100 ml


104 per 100 ml

30-Day Geometric Mean/Average Value

Total Coliform

1,000 per 100 ml

Escherichia coli

126 per 100 ml


35 per 100 ml

Where Water Samples are Collected


Contact Information

Public Health Division
County of Sonoma
Business Hours
Monday – Friday
7:30 AM – 4:30 PM
Office Location
625 5th Street
Santa Rosa, CA 95404
38.44178, -122.7158781

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Marine Biotoxin Monitoring Reports

Marine Biotoxin Monitoring Reports


The California Dept. of Public Health monitors the water along the California coast to provide information on the safety of eating shellfish.

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