Laserfiche WebLink
State Water Resources Control Board <br /> Division of Water Quality <br /> GAMA Program <br /> REGULATORY AND WATER QUALITY LEVELS' <br /> Nitrate (as Nitro en <br /> Type Agency Concentration <br /> Federal MCL US EPA 10 m /L as Nitrogen N <br /> State MCL SWRCB3 10 m /L as Nitrogen N <br /> Detection Limit for Purposes of SWRCB3 0.4 mg/L as Nitrogen (N) <br /> Reporting DLR <br /> Others: <br /> Public Health Goal (PHG) OEHHA4 10 mg/L as Nitrogen (N) <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, 17'h Edition, (SWRCB, 2016). <br /> 2US EPA—United States Environmental Protection Agency <br /> 3SWRCB—State Water Resources Control Board <br /> 40EHHA—Office of Environmental Health Hazard Assessment <br /> SUMMARY OF DETECTIONS IN PUBLIC WATER WELLS5 <br /> Detection Type Number of Groundwater Sources <br /> Number of active and standby public 854 of 11,906 wells sampled. <br /> wells with a nitrate concentrations > 10 <br /> mg/L (N) <br /> Top 3 counties with active and standby Los Angeles (128), Tulare (95), and Kern (88) <br /> public wells with a nitrate concentration > <br /> 10 mg/L (N) <br /> 513ased on 2007-2017 public standby and active well (groundwater sources) data collected by the SWRCB. <br /> 6Water 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 /> ANALYTICAL INFORMATION <br /> Method Detection Limit Note <br /> US EPA 300.0, 300.1 0.01-0.008 mg/L Nitrate-Nitrogen by Ion <br /> Depending on concentration Chromatography <br /> and presence of other <br /> components <br /> US EPA 353.2 0.05 mg/L Nitrate-Nitrite by Automated <br /> Colorimetry <br /> Public Drinking Water Public water systems are required to test for nitrate and must <br /> Testing Requirements report the results to the SWRCB. <br /> Revised November 2017 2 <br />