Nitrate
Desert Water Supply Corporation
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 | 0.0596 ppm | 2 | 2 | 0.0442 ppm - 0.0750 ppm |
| 2019 | 0.0531 ppm | 2 | 2 | 0.0384 ppm - 0.0678 ppm |
| 2020 | 0.0439 ppm | 2 | 2 | 0.0364 ppm - 0.0514 ppm |
| 2021 | 0.0546 ppm | 2 | 2 | 0.0397 ppm - 0.0694 ppm |
| 2022 | 0.0496 ppm | 2 | 2 | 0.0352 ppm - 0.0639 ppm |
| 2023 | 0.0482 ppm | 2 | 2 | 0.0332 ppm - 0.0631 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 |
|---|---|---|
| 2018-04-19 | Q1816226003 | 0.0442 ppm |
| 2018-04-19 | Q1816226007 | 0.0750 ppm |
| 2019-05-14 | Q1924857001 | 0.0678 ppm |
| 2019-05-14 | Q1924857008 | 0.0384 ppm |
| 2020-06-30 | Q2025933007 | 0.0514 ppm |
| 2020-06-30 | Q2025933010 | 0.0364 ppm |
| 2021-09-21 | Q2125878007 | 0.0694 ppm |
| 2021-09-21 | Q2125878012 | 0.0397 ppm |
| 2022-05-10 | Q2213913007 | 0.0352 ppm |
| 2022-05-10 | Q2213913008 | 0.0639 ppm |
| 2023-09-19 | Q2340246007 | 0.0631 ppm |
| 2023-09-19 | Q2340246008 | 0.0332 ppm |