Know Your Environment. Protect Your Health.

Nitrate and nitrite

Wilmot 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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND40ND
20210.0750 ppm42ND - 0.180 ppm
2022ND40ND
2023ND40ND

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
2018-01-31Y180320029ND
2018-04-10Y181020012ND
2018-07-09Y181930015ND
2018-10-09Y182840023ND
2019-01-15Y190170003ND
2019-04-08Y191010009ND
2019-09-16Y192620011ND
2019-10-15Y192900010ND
2020-01-13Y200170012ND
2020-04-14Y201080005ND
2020-07-21Y202060094ND
2020-11-17Y203240018ND
2021-01-12Y210140016ND
2021-04-20Y2111200210.120 ppm
2021-07-20Y2120300090.180 ppm
2021-10-12Y212870026ND
2022-01-11Y220130013ND
2022-04-19Y221110017ND
2022-07-20Y222020023ND
2022-10-26Y223000012ND
2023-01-10Y230120027ND
2023-04-26Y231170041ND
2023-08-30Y232430012ND
2023-10-09Y232850021ND