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State Water Resources Control Board <br /> Division of Water Quality <br /> GAMA Program <br /> ANALYTICAL INFORMATION <br /> Method Detection Limit Note <br /> US EPA 504.1, 551.1 0.01 pg/L DDW approved for public <br /> US EPA 524.1; 524.2 0.05 pg/L drinking water systems <br /> Known Limitations to Samples are preserved with sodium thiosulfate to avoid <br /> Analytical Methods possible reactions between residual chlorine and <br /> contaminants present in some solvents. Potential for <br /> interference with impurities contained in extracting solvents. <br /> The US EPA recommends methods 504.1 and 551.1. <br /> DBCP can be misidentified as ethylene dibromide. <br /> Laboratory confirmation procedures outlined by the US EPA <br /> should be strictly adhered to. <br /> Public Drinking Water The DDW established a MCL of 0.2 pg/L for this pesticide in <br /> Testing Requirements 1989, with associated requirements for quarterly monitoring, <br /> compliance determinations, and treatment. In 1991, the US <br /> EPA adopted a MCL of 0.2 pg/L and required monitoring for <br /> public water sources. <br /> Revised: July, 2016 <br />