Nitrate and nitrite
Aquarion Water Company of Connecticut - Stamford
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 |
---|---|---|---|---|
2014 | 0.185 ppm | 4 | 4 | 0.175 ppm - 0.199 ppm |
2015 | N/A | 0 | 0 | N/A |
2016 | 0.620 ppm | 4 | 4 | 0.115 ppm - 2.08 ppm |
2017 | 0.606 ppm | 5 | 5 | 0.0560 ppm - 2.47 ppm |
2018 | 0.00900 ppm | 2 | 2 | 0.00500 ppm - 0.0130 ppm |
2019 | 0.213 ppm | 2 | 2 | 0.206 ppm - 0.220 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 |
---|---|---|
2014-01-07 | 201400283-NOX | 0.199 ppm |
2014-01-07 | 201400282-IOCR | 0.186 ppm |
2014-05-05 | 201406146-IOCR | 0.175 ppm |
2014-05-05 | 201406147-NOX | 0.179 ppm |
2016-01-11 | 201600503-IOCR | 0.166 ppm |
2016-01-11 | 201600501-IOCR | 0.115 ppm |
2016-01-11 | 201600500-NOX | 0.118 ppm |
2016-10-31 | 201615141-NOX | 2.08 ppm |
2017-01-17 | 201701121-IOCR | 0.0560 ppm |
2017-01-17 | 201701124-NOX | 0.209 ppm |
2017-03-01 | 201703108-NOX | 2.47 ppm |
2017-03-13 | 201703761-IOCR | 0.0660 ppm |
2017-03-13 | 201703762-NOX | 0.227 ppm |
2018-01-02 | 201800018-IOCR | 0.00500 ppm |
2018-01-02 | 201800021-NOX | 0.0130 ppm |
2019-01-07 | 201900231-IOCR | 0.206 ppm |
2019-01-07 | 201900234-NOX | 0.220 ppm |