Nitrate and nitrite
Aquarion Water Company of Connecticut - Mystic
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.
14
Samples
0
Samples exceeding legal limit (MCL)
4
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.162 ppm | 3 | 3 | 0.0600 ppm - 0.352 ppm |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 0.170 ppm | 3 | 3 | 0.0690 ppm - 0.368 ppm |
| 2017 | 0.173 ppm | 3 | 3 | 0.0510 ppm - 0.417 ppm |
| 2018 | 0.0495 ppm | 2 | 2 | 0.0440 ppm - 0.0550 ppm |
| 2019 | 0.235 ppm | 3 | 3 | 0.106 ppm - 0.463 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 |
|---|---|---|
| 2014-05-05 | 201406104-NOX | 0.0730 ppm |
| 2014-05-05 | 201406105-IOCR | 0.0600 ppm |
| 2014-07-21 | 201410322-NOX | 0.352 ppm |
| 2016-05-02 | 201605544-NOX | 0.0720 ppm |
| 2016-05-02 | 201605551-NOX | 0.368 ppm |
| 2016-05-02 | 201605545-IOCR | 0.0690 ppm |
| 2017-05-02 | 201706330-NOX | 0.0520 ppm |
| 2017-05-02 | 201706339-NOX | 0.417 ppm |
| 2017-05-02 | 201706331-IOCR | 0.0510 ppm |
| 2018-05-07 | 201806155-NOX | 0.0550 ppm |
| 2018-05-07 | 201806152-IOCR | 0.0440 ppm |
| 2019-05-07 | 201906220-NOX | 0.135 ppm |
| 2019-05-07 | 201906217-IOCR | 0.106 ppm |
| 2019-10-28 | 201917770-NOX | 0.463 ppm |