Know Your Environment. Protect Your Health.

Nitrate and nitrite

Old Indian Trail

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.930 ppm110.930 ppm
20190.460 ppm110.460 ppm
20200.590 ppm110.590 ppm
20210.560 ppm110.560 ppm
20220.470 ppm110.470 ppm
20230.600 ppm110.600 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
2018-05-04180504-MFD-13539NOX0.930 ppm
2019-04-11190411MFDA-15198NOX0.460 ppm
2020-04-28200428MFDB-17110NOX0.590 ppm
2021-04-21210421MFDB-18820NOX0.560 ppm
2022-05-17220517MFDC-20706NOX0.470 ppm
2023-04-18230418MFDA-22165NOX0.600 ppm