The relative cleanliness of the shores might be linked to a severe lack of rain to wash pollutants into the water.
Six-year-old Derek Greathouse, left, and his 4-year-old brother Eli, of Austin, Texas, visit Muir Beach on Monday, July 18, 2022. Muir Beach was among Marin beaches to get top marks in a water quality report by the environmental nonprofit Heal The Bay.
released by Heal the Bay, an environmental group based in Santa Monica. The grades are based on concentrations of fecal bacteria contamination such as E. coli, which can indicate the potential presence of harmful bacteria, viruses and microorganisms that can cause disease. Similar trends were seen throughout the state. Heal the Bay said 91% of beaches monitored from Marin to Del Norte counties received A or B grades during the summer. The region also received 42% less rainfall than average, the report states.
For Marin, most of the data for these wet-weather scores were from the robust storm that occurred at the end of October. The storm was the first significant rainfall in nearly 10 months and flushed out pollutants that had built up over that time, leading to the lower scores, Kundu said. The 2021 report card also included two new Marin locations not included in recent reports: Drakes Beach and Drakes Estero. The data for these locations were collected by the Environmental Action Committee of West Marin, an environmental nonprofit based in Point Reyes Station, which has been monitoring the locations since 2020.
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