Nitrate and nitrite
Connecticut Water Company - Hebron Center Division
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.0700 ppm | 1 | 1 | 0.0700 ppm |
| 2019 | 0.0130 ppm | 1 | 1 | 0.0130 ppm |
| 2020 | 0.0160 ppm | 1 | 1 | 0.0160 ppm |
| 2021 | 0.0270 ppm | 1 | 1 | 0.0270 ppm |
| 2022 | 0.0200 ppm | 1 | 1 | 0.0200 ppm |
| 2023 | 0.0200 ppm | 2 | 2 | 0.0200 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 |
|---|---|---|
| 2018-04-09 | CA16134NOX | 0.0700 ppm |
| 2019-02-11 | NOX 200521212 | 0.0130 ppm |
| 2020-09-14 | NOX 200590106 | 0.0160 ppm |
| 2021-09-14 | 300059918 300059919 | 0.0270 ppm |
| 2022-01-13 | CK16247 | 0.0200 ppm |
| 2023-01-31 | CN33439 | 0.0200 ppm |
| 2023-10-24 | CP33084 | 0.0200 ppm |