Nitrate
Chisholm Hills Estates
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 | 0.0827 ppm | 2 | 2 | 0.0173 ppm - 0.148 ppm |
| 2019 | 0.0718 ppm | 2 | 2 | 0.0226 ppm - 0.121 ppm |
| 2020 | 0.0509 ppm | 2 | 2 | 0.0252 ppm - 0.0766 ppm |
| 2021 | 0.0453 ppm | 2 | 2 | 0.0195 ppm - 0.0711 ppm |
| 2022 | 0.170 ppm | 2 | 2 | 0.0436 ppm - 0.297 ppm |
| 2023 | 0.161 ppm | 2 | 2 | 0.0443 ppm - 0.277 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 |
|---|---|---|
| 2018-09-18 | Q1837077007 | 0.148 ppm |
| 2018-09-18 | Q1837077008 | 0.0173 ppm |
| 2019-05-21 | Q1927166001 | 0.121 ppm |
| 2019-05-21 | Q1927166002 | 0.0226 ppm |
| 2020-11-18 | Q2045746005 | 0.0766 ppm |
| 2020-11-18 | Q2045746006 | 0.0252 ppm |
| 2021-06-29 | Q2116975015 | 0.0711 ppm |
| 2021-06-29 | Q2116975016 | 0.0195 ppm |
| 2022-11-15 | Q2234333003 | 0.297 ppm |
| 2022-11-15 | Q2234333004 | 0.0436 ppm |
| 2023-07-20 | Q2328725001 | 0.0443 ppm |
| 2023-09-06 | Q2338462003 | 0.277 ppm |