Risk Factor: Risk Factor: Implications of Implications of Stringent Drinking Water Stringent Drinking Water StandardsStandards

Water QualityWater SupplyWater Cost

Safe Drinking Water Quality Act of 1974Regulates drinking water quality in the U.S.Ensures U.S. EPA controls substances with greatest

risk at lowest costPrevents contamination of source waterInforms consumers of contaminant levels and health

risksHelps states develop local regulations

Range of ContaminantsCommon PollutantsPerchlorateMTBECryptosporidiumChromium-6Disinfectant and disinfectant byproduct rule (D/DBP)Volatile organic compounds (VOCs)Compounds of Emerging Concerns (CECs)

The Debate About Regulation of Perchlorate and Chromium-6Southern California Water Coalition Advocates:

Proper regulations augmented by best science available Risk factors for contaminants must be based on hard

findings alone Regulations should be reconciled with feasibility of

compliance

Implications for the San Gabriel ValleyWater Quality

San Gabriel Basin WQA lead agency to clean up contaminated groundwater but $700 million funding gap

Water Supply Uncertainty about SWP and concerns about CR reliability

Water Cost Imported water costs will continue to increase