Know Your Environment. Protect Your Health.

Nitrate and nitrite

Connecticut Water Company - Amston Lake Division

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.290 ppm220.0200 ppm - 0.560 ppm
20190.367 ppm21ND - 0.734 ppm
20200.0240 ppm220.0230 ppm - 0.0250 ppm
20210.391 ppm220.00700 ppm - 0.774 ppm
20220.125 ppm220.0200 ppm - 0.230 ppm
20230.543 ppm330.0200 ppm - 1.05 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
2018-04-09CA16126NOX0.560 ppm
2018-04-09CA16127NOX0.0200 ppm
2019-02-19NOX 2005221110.734 ppm
2019-02-19NOX 200522112ND
2020-09-14NOX 2005900730.0230 ppm
2020-09-14NOX 2005900720.0250 ppm
2021-01-06NOX 2006029540.00700 ppm
2021-09-14300059922 3000599230.774 ppm
2022-01-12CK150280.230 ppm
2022-01-18CK185040.0200 ppm
2023-01-31CN334371.05 ppm
2023-01-31CN334350.0200 ppm
2023-10-24CP330870.560 ppm