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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.681 ppm | 5 | 5 | 0.104 ppm - 1.56 ppm |
| 2015 | 0.634 ppm | 5 | 5 | 0.101 ppm - 1.15 ppm |
| 2016 | 0.632 ppm | 5 | 5 | 0.0380 ppm - 1.48 ppm |
| 2017 | 0.595 ppm | 5 | 5 | 0.0390 ppm - 1.14 ppm |
| 2018 | 0.685 ppm | 5 | 5 | 0.0930 ppm - 1.29 ppm |
| 2019 | 0.733 ppm | 5 | 5 | 0.167 ppm - 1.34 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
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 |
|---|---|---|
| 2014-02-03 | 201401629-NOX | 0.281 ppm |
| 2014-02-03 | 201401645-NOX | 0.104 ppm |
| 2014-02-03 | 201401617-NOX | 0.492 ppm |
| 2014-06-18 | 201408445-NOX | 0.970 ppm |
| 2014-06-18 | 201408451-NOX | 1.56 ppm |
| 2015-02-03 | 201501491-NOX | 0.530 ppm |
| 2015-02-03 | 201501531-NOX | 0.340 ppm |
| 2015-02-03 | 201501519-NOX | 0.101 ppm |
| 2015-07-08 | 201508846-NOX | 1.15 ppm |
| 2015-07-08 | 201508843-NOX | 1.05 ppm |
| 2016-02-01 | 201601447-NOX | 0.456 ppm |
| 2016-02-01 | 201601433-NOX | 0.224 ppm |
| 2016-02-01 | 201601487-NOX | 0.0380 ppm |
| 2016-07-05 | 201608405-NOX | 0.960 ppm |
| 2016-07-05 | 201608402-NOX | 1.48 ppm |
| 2017-02-06 | 201701966-NOX | 0.509 ppm |
| 2017-02-06 | 201701995-NOX | 0.0390 ppm |
| 2017-02-06 | 201701980-NOX | 0.169 ppm |
| 2017-07-06 | 201710084-NOX | 1.12 ppm |
| 2017-07-06 | 201710080-NOX | 1.14 ppm |
| 2018-02-05 | 201801604-NOX | 0.599 ppm |
| 2018-02-05 | 201801570-NOX | 0.337 ppm |
| 2018-02-05 | 201801586-NOX | 0.0930 ppm |
| 2018-07-05 | 201809662-NOX | 1.11 ppm |
| 2018-07-05 | 201809658-NOX | 1.29 ppm |
| 2019-02-04 | 201901554-NOX | 0.523 ppm |
| 2019-02-04 | 201901581-NOX | 0.378 ppm |
| 2019-02-04 | 201901613-NOX | 0.167 ppm |
| 2019-07-01 | 201909695-NOX | 1.26 ppm |
| 2019-07-01 | 201909693-NOX | 1.34 ppm |