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Caption: Water quality parameters have been measured in an on-going program by the California Department of Fish and Game in various watersheds in Marin and Sonoma counties from 1991-2002. This graph shows minimum, mean, and maximum toxic un-ionized ammonia measurements in Ellis Creek, a tributary to the Petaluma River, from 1997-2001. The reference value of 0.025 mg/L is the maximum criteria established by the San Francisco Bay Regional Water Quality Control Board Basin Plan. See Info Links for more information.
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