Nitrate
Delta County Municipal Utility District
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 | 0.194 ppm | 4 | 4 | 0.132 ppm - 0.336 ppm |
| 2019 | 0.485 ppm | 3 | 3 | 0.476 ppm - 0.502 ppm |
| 2020 | 1.75 ppm | 3 | 3 | 1.73 ppm - 1.76 ppm |
| 2021 | 0.129 ppm | 3 | 3 | 0.113 ppm - 0.157 ppm |
| 2022 | 0.0774 ppm | 3 | 3 | 0.0676 ppm - 0.0917 ppm |
| 2023 | 1.03 ppm | 3 | 3 | 1.02 ppm - 1.04 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 |
|---|---|---|
| 2018-06-21 | Q1824882002 | 0.139 ppm |
| 2018-06-21 | Q1824882003 | 0.336 ppm |
| 2018-06-21 | Q1824882004 | 0.132 ppm |
| 2018-06-21 | Q1824882001 | 0.168 ppm |
| 2019-12-02 | Q1978463001 | 0.476 ppm |
| 2019-12-02 | Q1978463002 | 0.502 ppm |
| 2019-12-02 | Q1978463003 | 0.477 ppm |
| 2020-05-28 | Q2021185003 | 1.76 ppm |
| 2020-05-28 | Q2021185002 | 1.73 ppm |
| 2020-05-28 | Q2021185001 | 1.75 ppm |
| 2021-11-10 | Q2131574003 | 0.157 ppm |
| 2021-11-10 | Q2131574004 | 0.113 ppm |
| 2021-11-29 | Q2133547001 | 0.116 ppm |
| 2022-02-10 | Q2204938001 | 0.0730 ppm |
| 2022-02-10 | Q2204938002 | 0.0917 ppm |
| 2022-02-10 | Q2204938003 | 0.0676 ppm |
| 2023-03-15 | Q2310227001 | 1.03 ppm |
| 2023-03-15 | Q2310227002 | 1.02 ppm |
| 2023-03-15 | Q2310227003 | 1.04 ppm |