Know Your Environment. Protect Your Health.

Nitrate and nitrite

Gilman 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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.288 ppm62ND - 0.945 ppm
20190.677 ppm220.473 ppm - 0.881 ppm
2020N/A00N/A
20210.777 ppm440.424 ppm - 1.13 ppm
20220.812 ppm220.703 ppm - 0.920 ppm
20230.778 ppm220.515 ppm - 1.04 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
2018-02-12366993001ND
2018-02-12366994001ND
2018-02-27368853001ND
2018-02-27368854001ND
2018-03-193719240010.784 ppm
2018-03-193719230010.945 ppm
2019-02-054303830010.473 ppm
2019-02-054303840010.881 ppm
2021-02-025462290010.424 ppm
2021-02-025462280011.13 ppm
2021-02-025462290010.424 ppm
2021-02-025462280011.13 ppm
2022-02-016042220010.703 ppm
2022-02-016042230010.920 ppm
2023-04-106723540010.515 ppm
2023-04-106723530011.04 ppm