Frequent Questions

Why did EPA promulgate a combined nitrate/nitrite MCL?

EPA set a maximum contaminant level for combined nitrate and nitrite to account for the possible additive toxicity of these two chemicals and also to protect against the deterioration of the drinking water quality, since the presence of nitrite in water is indicative of water contaminated with sewage (54 FR 22062, 22077; May 22, 1989).
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