Skip to Content
County of Sonoma California

You are here:

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 2016
  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 4, 2016 <10 <10 <10 20 10 <10 10 <10 <10 41 10 <10 <10 <10 <10 63 <10 <10 122 <10 <10
April 11, 2016 10 10 <10 20 <10 <10 20 10 <10 10 10 <10 <10 <10 <10 63 <10 <10 10 <10 <10
April 18, 2016 41 10 <10 173 <10 10 31 20 <10 10 <10 <10 <10 <10 <10 97 31 <10 <10 <10 <10
April 25, 2016 10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 31 <10 <10 <10 <10 <10 10 <10 <10
May 2, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10
May 9, 2016 31 10 <10 10 <10 <10 <10 <10 <10 63 <10 <10 20 10 <10 10 10 <10 120 62 *
May 11, 2016 <10 <10 <10
May 16, 2016 10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
May 23, 2016 <10 <10 <10 <10 <10 <10 74 41 20 10 10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
May 31, 2016 <10 <10 <10 10 10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
June 6, 2016 10 <10 <10 10 <10 <10 <10 <10 <10 20 20 <10 <10 <10 10 <10 <10 <10 <10 <10 10
June 13, 2016 <10 <10 10 <10 <10 <10 <10 <10 <10 1,309 10 10 10 <10 <10 <10 <10 <10 <10 <10 <10
June 20, 2016 <10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 10 20 20 <10
June 27, 2016 <10 <10 <10 10 10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 <10 <10 <10
July 5, 2016 <10 <10 <10 <10 <10 <10 <10 20 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
July 11, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 10 <10 <10 <10 <10 <10 <10 <10
July 18, 2016 <10 <10 <10 10 <10 <10 20 10 <10 <10 <10 10 <10 <10 <10 52 20 <10 10 10 <10
July 25, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 10 <10
August 1, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
August 8, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10
August 15, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 10 <10 <10
August 22, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10 109 63 52 20 20 <10
August 29, 2016 <10 <10 <10 10 10 <10 <10 <10 <10 30 20 <10 <10 <10 <10 20 10 <10 20 10 20
September 6, 2016 <10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 10 <10 31
September 12, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 10 <10 <10 31 31 97 703 * 41 <10 <10 <10
September 13, 2016 <10 <10 10
September 19, 2016 20 10 <10 10 10 10 86 86 <10 31 20 <10 <10 <10 <10 119 41 31 41 31 97
September 26, 2016 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 10
October 3, 2016 <10 <10 10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 1,212 185 63 10 10 10
October 10, 2016 <10 <10 10 <10 <10 <10 <10 10 <10 <10 <10 <10 <10 <10 <10 201 122 75 41 10 10
October 17, 2016 20 <10 <10 20 <10 <10 41 10 10 10 <10 41 10 <10 <10 1,223 * * 63 20 <10
October 19, 2016 31 31 <10
October 24, 2016 20 10 <10 10 <10 <10 <10 <10 <10 4,106 10 52 <10 <10 <10 121 20 31 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 - 2015 (pdf)

Ocean Beaches Sampling Test Results - 2014 (pdf)

Ocean Beaches Sampling Test Results - 2013 (pdf)

Ocean Beaches Sampling Test Results - 2012 (pdf)

Ocean Beaches Sampling Test Results - 2011 (pdf)

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

Back to Top | Website Help | Contact Us | Website Privacy Policy | Notice of Privacy Practices | Get Adobe® Reader®