Nitrate
Utrwd Regional Water Treatment Plant
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 | 0.294 ppm | 2 | 2 | 0.0650 ppm - 0.523 ppm |
| 2019 | 0.496 ppm | 2 | 2 | 0.254 ppm - 0.738 ppm |
| 2020 | 0.459 ppm | 2 | 2 | 0.145 ppm - 0.772 ppm |
| 2021 | 0.387 ppm | 2 | 2 | 0.190 ppm - 0.583 ppm |
| 2022 | 0.248 ppm | 2 | 2 | 0.115 ppm - 0.380 ppm |
| 2023 | 0.487 ppm | 2 | 2 | 0.200 ppm - 0.774 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 | Lab ID | Result |
|---|---|---|
| 2018-02-13 | Q1805957003 | 0.523 ppm |
| 2018-09-25 | Q1838256006 | 0.0650 ppm |
| 2019-03-07 | Q1909910008 | 0.738 ppm |
| 2019-10-02 | Q1971112003 | 0.254 ppm |
| 2020-03-09 | Q2008448003 | 0.772 ppm |
| 2020-08-18 | Q2032859008 | 0.145 ppm |
| 2021-02-23 | Q2104596003 | 0.583 ppm |
| 2021-09-27 | Q2126305008 | 0.190 ppm |
| 2022-01-25 | Q2202436005 | 0.380 ppm |
| 2022-09-15 | Q2227673001 | 0.115 ppm |
| 2023-03-07 | Q2308901001 | 0.774 ppm |
| 2023-08-02 | Q2331445008 | 0.200 ppm |