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EPA puts off decision on regulating perchlorate in drinking water

EPA last week made a preliminary determination that 11 contaminants on the second drinking water contaminant candidate list (CCL) — a compilation of substances that may require a national drinking water health standard — do not require regulation, but two other contaminants on the list — perchlorate and methyl tertiary butyl ether (MTBE) — need more study to determine total human exposure and health risks.


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