Drinking water additives Fluoride IRWD’s drinking water is a blend of local groundwater and surface water, including water imported by MWD. IRWD’s local groundwater contains some naturally occurring fluoride, but we do not supplement with additional fluoride. In 2007, MWD joined a majority of the nation’s public water suppliers in adding fluoride to drinking water to help prevent tooth decay. MWD was in compliance with all provisions of the state’s fluoridation system requirements. For information on MWD’s fluoride program, visit bit.ly/MWDfluoride . For information on the fluoridation of drinking water, contact the DDW or U.S. Centers for Disease Control and Prevention. Disinfectants Drinking water regulations require some form of chlorine to be used at water treatment plants and to be maintained throughout the entire distribution system to prevent harmful bacteria from making it to the customer’s tap. IRWD uses chloramines to maintain a robust disinfectant for these purposes. Chloramines effectively inactivate harmful bacteria and are safe for consumption by humans (as well as our furry four-legged friends) at certain levels. Chloramines are monitored throughout the system, and we also watch for the presence of bacteria to be sure your drinking water is safe from end to end. People who use kidney dialysis machines may want to take special precautions and consult their physician for the appropriate type of water treatment. Customers who maintain fishponds, tanks or aquariums should also make necessary adjustments in water quality treatment, as these disinfectants are toxic to fish. For more information or questions about chloramines, visit IRWD.com or call 949-453-5300 .
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IRWD Water Quality Report 2026
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