Know Your Environment. Protect Your Health.

Nitrate and nitrite

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Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

6

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.342 ppm110.342 ppm
20190.314 ppm110.314 ppm
20200.275 ppm110.275 ppm
20210.300 ppm110.300 ppm
20220.370 ppm110.370 ppm
20230.350 ppm110.350 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2018-07-17IN*F1807078-01A0.342 ppm
2019-09-04ARS6-19-00891-0010.314 ppm
2020-03-11ARS6-20-00179-0010.275 ppm
2021-08-17PEF69821-NO30.300 ppm
2022-08-31PEF79000-NO30.370 ppm
2023-08-22PEF88161-NO30.350 ppm