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Caption: This graph shows pH measured approximately monthly in San Geronimo Creek and Lagunitas Creek at Shafter Bridge from 1995-2002. All values represent one-time sampling per month, except for a few values which represent the average of two samples taken that month (See Source Table). The reference values represent the San Francisco Bay Regional Water Quality Control Plan (SFRWQCB) 1995 Basin Plan pH range objective of 6.5-8.5 (CRWQCB, 1995). Data were collected by Marin Municipal Water District. See Info Links for more information.
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