Know Your Environment. Protect Your Health.

Nitrate

Aquarion Water Company of Connecticut - Main System

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.685 ppm550.0930 ppm - 1.29 ppm
20190.733 ppm550.167 ppm - 1.34 ppm
20200.688 ppm550.123 ppm - 1.28 ppm
20210.719 ppm550.111 ppm - 1.33 ppm
20220.772 ppm550.127 ppm - 1.60 ppm
20230.805 ppm550.0690 ppm - 1.56 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
2018-02-05201801570-NOX0.337 ppm
2018-02-05201801586-NOX0.0930 ppm
2018-02-05201801604-NOX0.599 ppm
2018-07-05201809662-NOX1.11 ppm
2018-07-05201809658-NOX1.29 ppm
2019-02-04201901554-NOX0.523 ppm
2019-02-04201901581-NOX0.378 ppm
2019-02-04201901613-NOX0.167 ppm
2019-07-01201909695-NOX1.26 ppm
2019-07-01201909693-NOX1.34 ppm
2020-02-03202001681-NOX0.600 ppm
2020-02-03202001624-NOX0.326 ppm
2020-02-03202001640-NOX0.123 ppm
2020-07-07202010259-NOX1.11 ppm
2020-07-07202010253-NOX1.28 ppm
2021-02-02202101448-NOX0.684 ppm
2021-02-02202101406-NOX0.111 ppm
2021-02-02202101394-NOX0.355 ppm
2021-07-06202110289-NOX1.12 ppm
2021-07-06202110283-NOX1.33 ppm
2022-02-07202202090-NOX0.477 ppm
2022-02-07202202022-NOX0.287 ppm
2022-02-07202202033-NOX0.127 ppm
2022-07-05202210995-NOX1.37 ppm
2022-07-05202210989-NOX1.60 ppm
2023-02-06202301854-NOX0.565 ppm
2023-02-06202301775-NOX0.0690 ppm
2023-02-09202302139-NOX0.418 ppm
2023-06-07202309441-NOX1.42 ppm
2023-06-07202309440-NOX1.56 ppm