Fort Baker, Horseshoe Cove - Northwest

Source Information

Marin County Environmental Health Services collects samples at this beach every Monday from April 1st - October 31st and tested for levels of total coliform, fecal coliform and enterococcus. Results are typically available to the public before the weekend. Swim Guide checks daily for updates during the monitoring season. The standards for indicator bacteria are as follows: Single sample maximum Total Coliform > 10,000 MPN (Most Probable Number) / 100 ml of water Fecal Coliform > 400 MPN / 100 ml Enterococcus > 104 MPN / 100 ml Geometric Mean (5 samples collected over a 30 day period) Total Coliform > 1,000 MPN / 100 ml of water Fecal Coliform > 200 MPN / 100 ml Enterococcus > 33 MPN / 100 ml A coastal beach is marked Green when bacteria levels for a single day and geometric mean are below the standards mentioned. A coastal beach is marked Red when bacteria levels for a single day or the geometric mean are above the standards mentioned. A beach is marked Grey when there is no current or reliable monitoring information available.