Know Your Environment. Protect Your Health.

Nitrate

Aquarion Water Company of Connecticut - Mystic

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

12

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0550 ppm110.0550 ppm
20190.299 ppm220.135 ppm - 0.463 ppm
20200.246 ppm220.111 ppm - 0.380 ppm
20210.231 ppm220.0690 ppm - 0.392 ppm
20220.0927 ppm31ND - 0.278 ppm
20230.272 ppm220.106 ppm - 0.438 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

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-05-07201806155-NOX0.0550 ppm
2019-05-07201906220-NOX0.135 ppm
2019-10-28201917770-NOX0.463 ppm
2020-05-04202006226-NOX0.111 ppm
2020-10-19202017023-NOX0.380 ppm
2021-05-03202106129-NOX0.0690 ppm
2021-05-03202106135-NOX0.392 ppm
2022-05-02202206699-NOXND
2022-07-18202212124-NOXND
2022-08-29202215061-NOX0.278 ppm
2023-05-01202306890-NOX0.106 ppm
2023-06-20202310453-NOX0.438 ppm