Several popular swimming spots in West Marin routinely failed the state’s recreational water quality standards last year, according to data compiled by the county’s ocean and bay monitoring program.
The monitoring program, which has seasonally sampled 27 sites in Marin since 2003, tests for the three most common indicators of human illness—E. coli, enterococcus and total coliform levels—and warns the public when the state standards for the indicator organisms are exceeded. Typically, the county requires…