75D - WATER QUALITY REPORT - Laserfiche WebLink

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8 8 8 Copper The PHG for copper is 0.17 mglL. There is no MCL for Copper. Instead the 90th percentile value of all samples ITom household taps in the distribution system cannot exceed an Action Level of 1.3 mg/L for copper. The category of health risk for copper is gastrointestinal irritation. Numerical health risk data on copper have not yet been provided by OEHHA, the State agency responsible for providing that information. All of our source water samples for copper in 2003 were less than the PHG. Based on extensive sampling of our distribution system in 2003, our 90th percentile value for copper was 0.3mg/L. Our water system is in full compliance with the Federal and State Lead and Copper Rule. Based on our extensive sampling, it was detennined according to State Regulatory requirements that we meet the Action Levels for copper. Therefore, we are deemed by CDHS to have "Optimized Corrosion Control" for our system. In general, optimizating corrosion control is considered to be the best available technology to deal with corrosion issues and with any lead or copper fmdings. We continue to monitor our water quality parameters that relate to corrosively, such as pH, hardness, alkalinity, and total dissolved solids. Action will be taken if necessary to maintain our system in an "Optimized Corrosion Control" condition. Since we are meeting the "Optimized Corrosion Control" requirements, it is not prudent to initiate additional corrosion control treatment as it involves the addition of other chemicals, and there could be additional water quality issues raised. Therefore, no estimate of cost has been included. Recommendations for Further Action: The drinking water quality of the City of Santa Ana meets all State of California, Department of Health Services and USEP A drinking water standards set to protect the public health. To further reduce the levels of the constituents identified in this report that are already significantly below the health-based Maximum Contaminant Levels established to provide "safe drinking water", an additional costly treatment process would be required. The effectiveness of the treatment process to provide any significant reductions in the constituents' levels at these already low values is uncertain. The health protection benefits of these further hypothetical reductions are not at all clear and may not be quantifiable. Therefore, no action is proposed. 3 75D-5