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State Water Resources Control Board <br />Division of Water Quality <br />GAMA Program <br />REGULATORY AND WATER QUALITY LEVELS' <br />Type <br />Agency <br />Concentration <br />Federal MCL <br />US EPA2 <br />10 /L <br />State MCL <br />SWRCB3 <br />10 µg/l_ <br />Detection Limit for Purposes of Reporting <br />SWRCB3 <br />2 µg/l_ <br />DLR <br />Others: <br />CA Public Health Goal (PHG) <br />SWRCB3 <br />0.004 µg/l_ <br />Cancer Potency Factor (1/106 cancer risk) <br />OEHHA4 <br />0.0037 µg/l_ <br />IRIS Reference Dose (RfD), non -cancer <br />US EPA <br />2.1 µg/1_5 <br />health <br />'These levels generally relate to drinking water; other water quality levels may exist. For further <br />information, see A Compilation of Water Quality Goals 171h Edition (SWRCB, 2016). <br />2 US EPA - United States Environmental Protection Agency <br />3 SWRCB - State Water Resources Control Board <br />4OEHHA—Office of Environmental Health Hazard Assessment <br />5IRIS — Integrated Risk Information System. Concentration reported as a drinking water level. <br />SUMMARY OF DETECTIONS IN PUBLIC WATER WELLS6 <br />Detection Type <br />Number of Groundwater Sources <br />Number of active and standby public water <br />931 of 9,381 wells tested <br />wells7 with arsenic concentrations <br />> 10 /L. <br />Top 3 Counties with active and standby <br />Kern (155), Los Angeles (68) and <br />public water wells with arsenic concentrations <br />San Bernardino (44) counties. <br />> 10 /L. <br />66ased on 2007-2017 public standby and active well (groundwater sources) data collected by the <br />SWRCB. <br />Water from active and standby wells is typically treated to prevent exposure to chemical concentrations <br />above the MCL. Data from private domestic wells and wells with less than 15 service connections are not <br />available. <br />Revised October 2017 <br />