Know Your Environment. Protect Your Health.

Nitrate and nitrite

Southbury Training School

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.900 ppm220.900 ppm
20190.900 ppm220.900 ppm
20200.920 ppm110.920 ppm
20210.785 ppm220.770 ppm - 0.800 ppm
20220.940 ppm110.940 ppm
2023N/A00N/A

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
2018-03-01309878GE0.900 ppm
2018-09-06316024GE0.900 ppm
2019-02-21321210GE0.900 ppm
2019-02-21321213GE0.900 ppm
2020-02-06331921GE0.920 ppm
2021-02-04CH565570.800 ppm
2021-08-19CJ005900.770 ppm
2022-12-14CN052630.940 ppm