EPA's drinking water standard for nitrate (measured as nitrogen) is 10 mg/L. A level of 45 mg/L nitrate is equivalent to 10 mg/L nitrate expressed as nitrogen (54 FR 22062, 22078, May 22, 1989). Adverse health effects would not be seen until levels of nitrate exceed 45 mg/L (expressed as nitrate) or 10 mg/L (expressed as nitrogen).
We had our well water tested and found 28.2 mg/L of nitrate (measured as nitrate). Is this a safe level?
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