Know Your Environment. Protect Your Health.

Nitrate and nitrite

J E S T C

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.500 ppm220.500 ppm
2019ND20ND
20200.1000 ppm110.1000 ppm
20210.120 ppm53ND - 0.200 ppm
2022ND20ND
2023ND20ND

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
2018-05-02B1801763-0010.500 ppm
2018-05-02B1801763-0010.500 ppm
2019-09-09B1903977-001ND
2019-09-09B1903977-001ND
2020-10-20B2005472-0010.1000 ppm
2021-03-29B2101458-002ND
2021-06-22B2102775-0020.200 ppm
2021-09-21B2104707-0020.200 ppm
2021-09-21B2104707-0030.200 ppm
2021-12-06B2106469-002ND
2022-08-22B2204056-002ND
2022-08-22B2204056-003ND
2023-12-11B2305294-001ND
2023-12-11B2305294-002ND