Slide 1

Municipal Water Quality and Your Health Public Health Seminar Series February 3, 2004 UA,Southwest Environmental Health Sciences Center Pima County Health Department City of Tucson Water Department

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Tucson Water Supply & Delivery System Mtns. Avra Valley AquiferTucson Basin Aquifer Tucson Basin Wellfields Wastewater Treatment Plant Avra Valley Wellfield CRW Recharge Water Treatment Plant Reclaimed Water Production Facilities Recharge and Recovery. Groundwater

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Potable System Overview

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Safe Drinking Water? Clean Water Act Safe Drinking Water Act

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Clean Water Act Passed 1972 SURFACE WATER Quality Purpose: fishable, swimmable water DRINKING WATER Quality Indirect protection of quality

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Safe Drinking Water Act Originally signed into law in 1974 Authorizes EPA and states to set drinking water standards (regulations) Protect drinking water supply from contamination Limit contaminant levels in drinking water

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Ground Water Test Requirements Coliform Bacteria (2) Inorganic Chemicals(15) Lead & Copper(2) Radiochemicals (3) plus Uranium starting 2004 Synthetic Chemicals (30) Volatile Chemicals (21) Disinfection By- Products Trihalomethanes (4) plus Haloacetic Acids (5) and Disinfectant Residuals starting 2004 Unregulated Contaminants (11)

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ACUTE Nitrate & Fecal Coliform How Fast Might These Contaminants Affect You? Over 90 standards Chronic All the rest (calculated lifetime risk) 2 ACUTE REST CHRONIC

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Reported Sodium