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DDW, these four chemicals do not have to be included in the 2019 PHGs Report <br />because they do not have an existing MCL. <br />3.0 Identification of Contaminants <br />Section 116470(b)(1) of the Health and Safety Code requires public water systems <br />serving more than 10,000 service connections to identify each contaminant detected in <br />drinking water that exceeded the applicable PHG. Section 116470(f) requires the <br />MCLG to be used for comparison if there is no applicable PHG. <br />The City of Santa Ana (City) water system has approximately 44,838 service <br />connections. The following constituents were detected at one or more locations within <br />the drinking water system at levels that exceeded the applicable PHGs or MCLGs: <br />• Arsenic — naturally -occurring in local groundwater <br />• Bromate — formed when naturally -occurring bromide reacts with ozone during the <br />disinfection process. <br />• Coliform Bacteria, Total — naturally -occurring in the environment but can also be <br />an indicator of the presence of other pathogenic organisms originating from <br />sewage, livestock or other wildlife. <br />• Perchlorate — industrial contamination in groundwater <br />• Gross alpha particle activity (gross alpha) — naturally -occurring in local <br />groundwater and surface water purchased from MWDSC <br />• Gross beta particle activity (gross beta) — naturally -occurring in surface water <br />purchased from MWDSC <br />• Uranium — naturally -occurring in local groundwater and in surface water <br />purchased from MWDSC. <br />The accompanying chart shows the applicable PHG or MCLG and MCL for each <br />contaminant identified above. The chart includes the maximum, minimum, and average <br />City of Santa Ana 3 2019 PHGs Report <br />75C-6 <br />