Nitrate (as N)
Inorganic nonmetal compounds that form naturally when nitrogen combines with oxygen or ozone
Health Guideline Level (HGL)
10 ppb
Maximum level that poses minimal health risk based on the latest science
Health Effects
Nitrate levels that exceed EPA drinking water limits can change the ability of blood to adequately carry oxygen through the body—a health risk to infants and pregnant women. Infants are particularly susceptible to these effects, which cause an acute illness known as 'blue baby syndrome' with symptoms including shortness of breath and bluish skin that develop rapidly over the span of a few days and may cause death if left untreated. There is limited and uncertain evidence that nitrate may cause some gastrointestinal cancers as well as thyroid dysfunction, developmental and reproductive toxicity in humans.
Affected Organs & Systems:
Common Sources
- Naturally occurring and often present in drinking water at levels that do not affect health
- Can contaminate both ground and surface water, though concentrations are generally higher in well water
- Sources of nitrate include agricultural runoff (chemical fertilizers and animal waste), industrial waste, sewage and septic systems, and the erosion of natural deposits
How to Remove It
Water filters certified under the following NSF standards are effective at removing Nitrate (as N):
Health Guideline Level
The HGL represents the maximum level that poses minimal health risk based on the latest scientific research. It's often more protective than federal legal limits.
Contaminant Type
Nitrate (as N) is classified as a Inorganics contaminant.
This contaminant primarily affects the blood.
Check Your Water
Find out if Nitrate (as N) is in your tap water.
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