Know Your Environment. Protect Your Health.

Nitrate and nitrite

Torrington Water Company

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0176 ppm31ND - 0.0528 ppm
2019ND30ND
2020ND30ND
20210.0178 ppm31ND - 0.0534 ppm
2022ND30ND
20230.00700 ppm21ND - 0.0140 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
2018-05-08D8E0876-02NOXR0.0528 ppm
2018-05-08D8E0876-01NOXRND
2018-05-08D8E0850-01NOXND
2019-05-14D9E1446-01NOXND
2019-05-14D9E1476-02IOCRND
2019-05-14D9E1476-01IOCRND
2020-05-12D0E0828-03IOCND
2020-05-12D0E0828-04IOCND
2020-05-12D0E0838-R01NOXND
2021-05-11D1E1046-01NOX0.0534 ppm
2021-05-18D1E1893-02IOCND
2021-05-18D1E1893-01IOCND
2022-05-09D2E0916-02IOCND
2022-05-09D2E0916-01IOCND
2022-05-10D2E0918-01NOXND
2023-04-04202305020-NOX0.0140 ppm
2023-04-04202305019-IOCRND