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
10,000 per 100 ml
400 per 100 ml
104 per 100 ml
30-Day Geometric Mean/Average Value
1,000 per 100 ml
126 per 100 ml
35 per 100 ml
Where Water Samples are Collected