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County of Sonoma California

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Ocean Water Quality Monitoring

Sonoma County has approximately 64 miles of coastal beaches. In order to protect the health of the public, weekly samples are collected and tested between April 1 and October 31 by the Department of Health Services to monitor bacterial levels.

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.

Weekly Ocean Water Quality Test Results

Ocean Beaches - Sampling 2017
  Gualala Regional Park Beach Black Point Regional Park Beach Stillwater Regional Park Beach Goat Rock State Beach Salmon Creek State Beach Campbell Cove State Beach Doran Regional Park Beach
Date Collected TC EC ENT TC EC ENT TC EC ENT TC EC ENT TC EC ENT TC EC ENT TC EC ENT
April 3, 2017 10 <10 <10 <10 <10 <10 86 41 <10 20 <10 <10 20 10 <10 20 <10 <10 <10 <10 <10
April 10, 2017 <10 <10 <10 20 <10 <10 110 41 <10 465 20 <10 20 <10 <10 31 20 <10 73 41 <10
April 17, 2017 <10 <10 <10 <10 <10 <10 52 <10 <10 <10 <10 <10 31 10 <10 <10 <10 <10 <10 <10 <10

*Resample conducted

Print this table (pdf)

Color Key

Colored results in above table signify the following:

GREEN: Beach is open. Health risk is low for water contact. Bacterial levels are within State standards (pdf).

YELLOW: Beach is open. There is an increased health risk for water contact. Bacterial levels have exceeded State standards (pdf). Swimming/wading is not advised.

RED: Beach is closed. There is a significant health risk for water contact. Bacterial levels have exceeded State standards (pdf) and/or there is a known sewage release/spill. Avoid any contact with water until further notice.

Acronyms

TC = Total Coliform - Most Probable Number (MPN)

EC = Escherichia coli - MPN

ENT = Enterococcus - MPN

Test Results from Previous Years

Ocean Beaches Sampling Test Results - 2016 (pdf)

Ocean Beaches Sampling Test Results - 2015 (pdf)

What's New

Related Links

Ocean Water Quality Monitoring: More Information
Includes a map of the water quality monitoring locations.

Test Results Updates

External site: Opens web site in new browser window.
Subscribe to Ocean Water Quality Monitoring updates

For current Beach Sampling postings, call the Hotline at (707) 565-6552.

Health Topics

Recreational Water Illnesses (RWIs)
Source: The Centers for Disease Control and Prevention.

Contact

Environmental Health and Safety Programs
625 5th Street
Santa Rosa, CA 95404
(707) 565-6565
eh@sonoma-county.org

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