Nitrate
Kingston Water 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 |
|---|---|---|---|---|
| 2018 | 0.474 ppm | 2 | 2 | 0.371 ppm - 0.577 ppm |
| 2019 | 0.698 ppm | 2 | 2 | 0.647 ppm - 0.748 ppm |
| 2020 | 0.578 ppm | 2 | 2 | 0.442 ppm - 0.714 ppm |
| 2021 | 0.551 ppm | 2 | 2 | 0.374 ppm - 0.727 ppm |
| 2022 | 0.635 ppm | 4 | 4 | 0.463 ppm - 0.806 ppm |
| 2023 | 0.529 ppm | 2 | 2 | 0.465 ppm - 0.593 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
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 | Result |
|---|---|
| 2018-02-05 | 0.371 ppm |
| 2018-02-05 | 0.577 ppm |
| 2019-02-04 | 0.647 ppm |
| 2019-02-04 | 0.748 ppm |
| 2020-02-10 | 0.442 ppm |
| 2020-02-10 | 0.714 ppm |
| 2021-02-01 | 0.374 ppm |
| 2021-02-01 | 0.727 ppm |
| 2022-02-15 | 0.463 ppm |
| 2022-02-15 | 0.806 ppm |
| 2022-02-15 | 0.463 ppm |
| 2022-02-15 | 0.806 ppm |
| 2023-02-15 | 0.465 ppm |
| 2023-02-15 | 0.593 ppm |