The 2026 monitoring season ended October 31. The map shows the last results collected and does not reflect current conditions. Sampling resumes in April 2027.”
Related
-
Beach water monitoring
Beach water samples are taken weekly to make sure the water is not contaminated and meets California's safety standards for swimming, wading, and other recreational activities.
-
Beach water quality information
List of weekly beach water test results of locations in Marin County. April to October each year.