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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

Weekly results will appear here.

Monday sampling locations
Location Week of
10/5/26		 Week of
10/12/26		 Week of
10/19/26		 Week of
10/26/26
Chicken Ranch Ditch - Channel B AVOID AVOID TBA TBA
Chicken Ranch Beach OK OK TBA TBA
Dillon Beach OK OK TBA TBA
Dillon Beach Ditch OK AVOID TBA TBA
Green Bridge AVOID OK TBA TBA
Heart's Desire OK OK TBA TBA
Inkwells AVOID OK TBA TBA
Lawson's Landing OK OK TBA TBA
Miller Park OK OK TBA TBA
Millerton Point OK OK TBA TBA
Shell Beach OK OK TBA TBA
Drakes Beach OK N/A TBA TBA
Drakes Estero OK N/A TBA TBA
Whitehouse Pool  AVOID AVOID TBA TBA
Tuesday sample locations
Location Week of
10/5/26		 Week of
10/12/26		 Week of
10/19/26		 Week of
10/26/26
Bolinas Beach                                                                                         OK OK TBA TBA
China Camp OK OK TBA TBA
Fort Baker, Horseshoe Cove - Southwest N/A N/A TBA TBA
Fort Baker, Horseshoe Cove - Northwest OK OK TBA TBA
Fort Baker, Horseshoe Cove - Northeast N/A N/A TBA TBA
McNear's Beach OK OK TBA TBA
Muir Beach - North N/A N/A TBA TBA
Muir Beach - Central OK OK TBA TBA
Muir Beach - South N/A N/A TBA TBA
Paradise Beach OK OK TBA TBA
Rodeo Beach - North OK OK TBA TBA
Rodeo Beach - Central N/A N/A TBA TBA
Rodeo Beach - South N/A N/A TBA TBA
Schoonmaker Beach AVOID OK TBA TBA
Stinson Beach - North OK OK TBA TBA
Stinson Beach - Central OK OK TBA TBA
Stinson Beach - South N/A N/A TBA TBA

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Page last updated on October 16, 2026.

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