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Marin County’s water quality monitoring program gathered data from 25 bayside and oceanside monitoring locations. Ocean locations included: Dillon Beach, Bolinas Beach (Wharf Road), Stinson Beach, Muir Beach, Rodeo Beach, and Baker Beach. These locations were monitored on a weekly basis from April through October. During the winter season there was no monitoring. For additional
water quality information, visit the Marin
County Department
of Environmental
Health website.
Summer dry weather water quality was good at most beaches in Marin County. (Figure 9 and 10). Four monitoring locations saw a substantial worsening of water quality compared to last year’s AB411 time period. Golden Hinde (D), North Muir Beach (D), China Camp (D), and McNears Beach (D) all exceeded the 30-day geometric mean for at least one bacterial indicator on more than half of the sampling days this year. Last year, only China Camp exceeded a geometric mean threshold, and only for a couple of days. As a result, these previously A grade beaches received the lowest grades in the county this year.
There was an insufficient amount of non-AB411 dry weather, and wet weather data for further analysis.
Sewage
Spill Summary
There were zero (0) reported sewage spills in Marin
County that led to beach closures.
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