Nitrate and nitrite
Aquarion Water Company of Connecticut - Main 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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 0.538 ppm | 8 | 8 | 0.102 ppm - 1.56 ppm |
2015 | N/A | 0 | 0 | N/A |
2016 | 0.480 ppm | 8 | 8 | 0.0340 ppm - 1.48 ppm |
2017 | 0.453 ppm | 8 | 8 | 0.0390 ppm - 1.14 ppm |
2018 | 0.560 ppm | 8 | 8 | 0.0880 ppm - 1.29 ppm |
2019 | 0.598 ppm | 8 | 8 | 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 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 |
---|---|---|
2014-02-03 | 201401617-NOX | 0.492 ppm |
2014-02-03 | 201401629-NOX | 0.281 ppm |
2014-02-03 | 201401630-IOCR | 0.279 ppm |
2014-02-03 | 201401644-IOCR | 0.102 ppm |
2014-02-03 | 201401645-NOX | 0.104 ppm |
2014-02-03 | 201401616-IOCR | 0.512 ppm |
2014-06-18 | 201408445-NOX | 0.970 ppm |
2014-06-18 | 201408451-NOX | 1.56 ppm |
2016-02-01 | 201601433-NOX | 0.224 ppm |
2016-02-01 | 201601446-IOCR | 0.431 ppm |
2016-02-01 | 201601434-IOCR | 0.220 ppm |
2016-02-01 | 201601486-IOCR | 0.0340 ppm |
2016-02-01 | 201601487-NOX | 0.0380 ppm |
2016-02-01 | 201601447-NOX | 0.456 ppm |
2016-07-05 | 201608405-NOX | 0.960 ppm |
2016-07-05 | 201608402-NOX | 1.48 ppm |
2017-02-06 | 201701981-IOCR | 0.162 ppm |
2017-02-06 | 201701965-IOCR | 0.444 ppm |
2017-02-06 | 201701994-IOCR | 0.0430 ppm |
2017-02-06 | 201701980-NOX | 0.169 ppm |
2017-02-06 | 201701966-NOX | 0.509 ppm |
2017-02-06 | 201701995-NOX | 0.0390 ppm |
2017-07-06 | 201710084-NOX | 1.12 ppm |
2017-07-06 | 201710080-NOX | 1.14 ppm |
2018-02-05 | 201801603-IOCR | 0.632 ppm |
2018-02-05 | 201801571-IOCR | 0.332 ppm |
2018-02-05 | 201801587-IOCR | 0.0880 ppm |
2018-02-05 | 201801586-NOX | 0.0930 ppm |
2018-02-05 | 201801570-NOX | 0.337 ppm |
2018-02-05 | 201801604-NOX | 0.599 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 |
2019-02-04 | 201901614-IOCR | 0.177 ppm |
2019-02-04 | 201901582-IOCR | 0.396 ppm |
2019-02-04 | 201901553-IOCR | 0.550 ppm |
2019-07-01 | 201909695-NOX | 1.26 ppm |
2019-07-01 | 201909693-NOX | 1.34 ppm |