Know Your Environment. Protect Your Health.

Nitrate and nitrite

Hofheins/marcel Thomas Association Co-op Inc.

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.345 ppm220.270 ppm - 0.420 ppm
20190.260 ppm220.200 ppm - 0.320 ppm
20200.285 ppm220.240 ppm - 0.330 ppm
20210.300 ppm220.260 ppm - 0.340 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
2018-10-1620180296870.270 ppm
2018-10-1620180296880.420 ppm
2019-08-2720190242780.320 ppm
2019-08-2720190242790.200 ppm
2020-10-0620203986960.330 ppm
2020-10-0620203986970.240 ppm
2021-10-0620211950710.340 ppm
2021-10-0620211950720.260 ppm
2022-10-252210C39-002ND
2022-10-252210C40-002ND
2023-10-112310641-003ND
2023-10-112310642-003ND