Inorganic
Nitrite in your water
Health effects
Nitrite is a more reactive form of nitrogen pollution from the same sources as nitrate. It reduces the blood's oxygen-carrying capacity and is most hazardous to infants. It usually appears alongside nitrate where contamination is present.
The guideline vs. the legal limit
The federal legal limit is the maximum allowed by law. The EWG health guideline is what independent scientists consider safe — it is often far stricter.
Health guideline (EWG)
0.14 ppm
Federal legal limit (MCL)
1 ppm
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Nitrite
We're still cataloging certified systems for Nitrite. A free water test is the fastest way to get a matched recommendation.
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See your Water Score
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Get your custom fix-it plan
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Book your free 30-min test
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Is Nitrite in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.