EPA reviewed nitrate as part of the Six Year Review and determined that the 10 mg/L or 10 ppm MCLG and 10 mg/L or 10 ppm MCL for nitrate are still protective of human health.
Is there an ongoing assessment of the nitrate NPDWR standard? The March 2010 6-year review (http://water.epa.gov/lawsregs/rulesregs/regulatingcontaminants/sixyearreview/second_review/index.cfm#summary) lists nitrate as either having a health effects asses
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