Among its sampling programs the Tomales Bay Watershed Council Foundation (now the Tomales Bay Foundation) conducted 5-week winter and summer sampling at 14 sites in the Tomales Bay Watershed (as shown here). The samples are obtained by staff of the Inverness Public Utilities District and the water is analyzed at a certified lab and funded by the Regional Water Quality Control Board. Here are the results from 2004 to 2021 for 3 sites at Inverness on the west side of the Bay. The charts below indicate the Geomean of each 5-week series.
