Know Your Environment. Protect Your Health.

Nitrate and nitrite

Aquarion Water Company of Connecticut - Simsbury System

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.16 ppm660.719 ppm - 3.70 ppm
20192.45 ppm660.704 ppm - 3.80 ppm
20201.54 ppm550.591 ppm - 2.80 ppm
20211.88 ppm440.749 ppm - 3.21 ppm
20222.32 ppm330.853 ppm - 4.07 ppm
20232.38 ppm330.969 ppm - 3.92 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
2018-04-04201804071-NOX3.70 ppm
2018-04-04201804073-NOX1.70 ppm
2018-04-04201804075-NOX2.04 ppm
2018-04-04201804080-NOX0.719 ppm
2018-04-04201804077-NOX3.12 ppm
2018-08-16201812620-NOX1.65 ppm
2019-03-06201902893-NOX2.70 ppm
2019-03-06201902902-NOX3.12 ppm
2019-03-06201902896-NOX3.80 ppm
2019-03-06201902898-NOX1.11 ppm
2019-03-06201902900-NOX3.30 ppm
2019-03-06201902905-NOX0.704 ppm
2020-04-22202005610-NOX2.80 ppm
2020-04-22202005613-NOX0.603 ppm
2020-04-22202005606-NOX1.71 ppm
2020-04-22202005601-NOX2.02 ppm
2020-07-22202011197-NOX0.591 ppm
2021-05-06202106418-NOX1.87 ppm
2021-05-06202106421-NOX3.21 ppm
2021-05-06202106419-NOX1.69 ppm
2021-05-06202106422-NOX0.749 ppm
2022-05-05202207063-NOX0.853 ppm
2022-05-05202207066-NOX4.07 ppm
2022-05-05202207067-NOX2.05 ppm
2023-05-03202307226-NOX0.969 ppm
2023-05-03202307228-NOX3.92 ppm
2023-05-03202307227-NOX2.25 ppm