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Nitrates are chemical units of nitrogen and oxygen most commonly
used in fertilizer. Possible sources of nitrates include livestock
manure, human feces and densely-fertilized agricultural runoff.
The Environmental
Protection Agency (EPA) has set the maximum contaminant level
(MCL) for nitrates at 10,000 parts per billion (ppb).
For more information about nitrates, see the EPA's
Fact Sheet.
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