Know Your Environment. Protect Your Health.

Nitrate and nitrite

Bradley Waterworks

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND30ND
2020ND30ND
20210.0520 ppm52ND - 0.140 ppm
2022ND30ND
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
2018-05-29Y181510006ND
2018-05-29Y181510007ND
2018-08-13Y182280033ND
2018-10-16Y182910011ND
2019-05-13Y191360018ND
2019-07-31Y192130002ND
2019-11-05Y193110002ND
2020-06-02Y201560020ND
2020-08-18Y202330050ND
2020-11-17Y203240046ND
2021-04-19Y2111100240.120 ppm
2021-04-19Y2111100230.140 ppm
2021-07-26Y212100035ND
2021-07-26Y212100033ND
2021-11-16Y213220017ND
2022-04-19Y221110013ND
2022-08-15Y222300037ND
2022-10-11Y222850016ND
2023-06-06Y231590015ND
2023-06-06Y231590016ND