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Caption: Un-ionized ammonia is extremely toxic to fish and other aquatic organisms. The U.S. Environmental Protection Agency has set a maximum objective of 0.025 milligrams per liter (mg/L) shown in red hatch marks above. Five out of eight stations monitored by the NCRWQCB (Winchester, 1995) exceeded EPA standards. Pump 9 and Pump D show the highest un-ionized ammonium levels. The percent of the total amount of nitrogen and ammonia present that form un-ionized ammonia increases as temperature and pH rise. Click on Info Links for more information.
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