Know Your Environment. Protect Your Health.

Nitrate and nitrite

Connecticut Correctional Institute

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)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.53 ppm330.400 ppm - 2.80 ppm
20190.926 ppm550.220 ppm - 1.96 ppm
20202.66 ppm441.68 ppm - 3.33 ppm
20212.24 ppm331.78 ppm - 2.93 ppm
20222.22 ppm660.430 ppm - 2.91 ppm
20231.68 ppm330.420 ppm - 2.64 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
2018-01-16308607GE1.40 ppm
2018-01-30309000GE2.80 ppm
2018-01-30309007GE0.400 ppm
2019-01-22CC329201.75 ppm
2019-01-29CC356790.220 ppm
2019-01-29CC356821.96 ppm
2019-12-10330469GE0.300 ppm
2019-12-10330470GE0.400 ppm
2020-01-30CF239203.33 ppm
2020-02-25CF375301.68 ppm
2020-06-23CG191712.76 ppm
2020-11-03CH080212.86 ppm
2021-01-14CH464132.00 ppm
2021-01-14CH464122.93 ppm
2021-01-14CH464141.78 ppm
2022-02-08CK318642.88 ppm
2022-02-08CK318662.14 ppm
2022-02-08CK318682.91 ppm
2022-09-13CM294622.55 ppm
2022-09-13CM294630.430 ppm
2022-09-13CM294642.42 ppm
2023-09-19CP025672.64 ppm
2023-09-19CP025681.98 ppm
2023-09-19CP025690.420 ppm