Know Your Environment. Protect Your Health.

Nitrate and nitrite

Windham Water Works

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.115 ppm220.1000 ppm - 0.130 ppm
20190.118 ppm440.110 ppm - 0.130 ppm
20200.0300 ppm220.0200 ppm - 0.0400 ppm
20210.113 ppm330.110 ppm - 0.120 ppm
20220.0900 ppm330.0800 ppm - 0.1000 ppm
20230.113 ppm330.110 ppm - 0.120 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
2018-10-16CB723450.130 ppm
2018-10-16CB723460.1000 ppm
2019-05-14CD123670.130 ppm
2019-05-21CD18365R0.110 ppm
2019-05-21CD183650.110 ppm
2019-05-21CD183640.120 ppm
2020-09-02CG668370.0400 ppm
2020-10-06CG914250.0200 ppm
2021-10-12CJ538280.110 ppm
2021-11-02CJ701530.120 ppm
2021-11-02CJ701560.110 ppm
2022-11-21CM894620.0800 ppm
2022-11-30CM938140.1000 ppm
2022-11-30CM938130.0900 ppm
2023-10-31CP379590.110 ppm
2023-10-31CP379580.110 ppm
2023-11-07CP421730.120 ppm