Know Your Environment. Protect Your Health.

Nitrate and nitrite

Aquarion Water Company of Connecticut - Stamford

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.00900 ppm220.00500 ppm - 0.0130 ppm
20190.213 ppm220.206 ppm - 0.220 ppm
20200.0875 ppm440.0430 ppm - 0.133 ppm
20210.185 ppm220.184 ppm - 0.185 ppm
20220.0210 ppm51ND - 0.105 ppm
20230.0335 ppm42ND - 0.119 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
2018-01-02201800021-NOX0.0130 ppm
2018-01-02201800018-IOCR0.00500 ppm
2019-01-07201900231-IOCR0.206 ppm
2019-01-07201900234-NOX0.220 ppm
2020-01-06202000151-IOCR0.133 ppm
2020-01-06202000154-NOX0.127 ppm
2020-07-06202010216-IOCR0.0470 ppm
2020-07-06202010220-NOX0.0430 ppm
2021-01-04202100057-NOX0.184 ppm
2021-01-04202100054-IOCR0.185 ppm
2022-01-03202200070-IOCRND
2022-01-03202200073-NOX0.105 ppm
2022-07-18202212143-IOCRND
2022-07-18202212143-NOXND
2022-07-18202212142-NOXND
2023-01-03202300186-IOCRND
2023-01-03202300189-NOX0.119 ppm
2023-08-07202313852-IOCRND
2023-08-07202313851-NOX0.0150 ppm