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Beach water quality information

List of weekly test results from April to October.

We test water quality at 31 locations in Marin County.  We start the first week of April and end in the last week of October. 

Beach Water Quality Monitoring Update
Seasonal water quality monitoring has concluded for 2025. Routine sampling will resume in April 2026.

Thank you for your interest in our water quality program. Please check back in the spring for updated results.

Monday sampling locations
Location Week of
7/6/26		 Week of
7/13/26		 Week of
7/20/26		 Week of
7/27/26		 Week of
8/3/26
Chicken Ranch Ditch - Channel B AVOID AVOID      
Chicken Ranch Beach OK OK      
Dillon Beach OK OK      
Dillon Beach Ditch AVOID AVOID      
Green Bridge OK AVOID      
Heart's Desire OK OK      
Inkwells OK AVOID      
Lawson's Landing OK OK      
Miller Park OK N/A      
Millerton Point OK N/A      
Shell Beach OK OK      
Drakes Beach OK OK      
Drakes Estero OK OK      
Whitehouse Pool  OK AVOID      
Tuesday sample locations
Location Week of
7/6/26		 Week of
7/13/26		 Week of
7/20/26		 Week of
7/27/26		 Week of
8/3/26
Bolinas Beach                                                                                         OK AVOID      
China Camp OK OK      
Fort Baker, Horseshoe Cove - Southwest N/A N/A      
Fort Baker, Horseshoe Cove - Northwest OK OK      
Fort Baker, Horseshoe Cove - Northeast N/A N/A      
McNear's Beach OK OK      
Muir Beach - North N/A N/A      
Muir Beach - Central N/A OK      
Muir Beach - South N/A N/A      
Paradise Beach OK OK      
Rodeo Beach - North OK OK      
Rodeo Beach - Central N/A N/A      
Rodeo Beach - South N/A N/A      
Schoonmaker Beach OK AVOID      
Stinson Beach - North OK OK      
Stinson Beach - Central OK OK      
Stinson Beach - South N/A N/A      

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Page last updated on Julio 16, 2026.

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