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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. The graph shows yearly minimum, mean, and maximum un-ionized ammonia measurements in Bloomfield Fork, a tributary to Americano Creek, from 1996-2001. Levels in 1999/2000 and 2000/2001 would be very unhealthy for fish life. The reference value represents the San Francisco Bay Regional Water Quality Control Board (SFRWQCB) 1995 Basin Plan annual mean criterion for un-ionized ammonia of 0.025 mg/L (CRWQCB, 1995). Note that this watershed is actually within the jurisdiction of the North Coast Regional Water Quality Control Board, which has no objective for un-ionized ammonia. See Map for sampling locations and Info Links for more information.
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