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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. This page displays the latest reported results.

 

Monday sampling locations
Location Week of 
7/7/25		 Week of 
7/14/25		 Week of
7/22/25		 Week of
7/28/25
Chicken Ranch Ditch - Channel B N/A N/A AVOID N/A
Chicken Ranch Beach OK OK AVOID OK
Dillon Beach OK OK OK OK
Dillon Beach Ditch OK OK OK OK
Green Bridge OK OK OK OK
Heart's Desire OK OK OK OK
Inkwells OK OK AVOID OK
Lawson's Landing OK OK OK OK
Miller Park OK OK OK OK
Millerton Point OK OK OK OK
Shell Beach OK OK OK OK
Drakes Beach OK OK OK OK
Drakes Estero OK OK AVOID OK
Whitehouse Pool  OK AVOID AVOID OK
Tuesday sample locations
Location Week of 
7/7/25		 Week of 
7/14/25		 Week of 
7/22/25		 Week of
7/28/25
Bolinas Beach                                                                                         OK OK OK OK
China Camp OK OK OK OK
Fort Baker, Horseshoe Cove - Southwest N/A N/A N/A N/A
Fort Baker, Horseshoe Cove - Northwest OK OK   OK
Fort Baker, Horseshoe Cove - Northeast N/A N/A N/A N/A
McNear's Beach OK OK OK OK
Muir Beach - North OK OK OK OK
Muir Beach - Central OK OK OK OK
Muir Beach - South N/A N/A N/A N/A
Paradise Beach OK OK OK OK
Rodeo Beach - North OK OK OK OK
Rodeo Beach - Central N/A N/A N/A N/A
Rodeo Beach - South N/A N/A N/A N/A
Schoonmaker Beach OK OK OK OK
Stinson Beach - North OK OK OK OK
Stinson Beach - Central OK OK OK OK
Stinson Beach - South N/A N/A N/A N/A

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Page last updated on July 31, 2025.

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