Nitrate
City Of Glen Rose
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 | 0.0290 ppm | 4 | 4 | 0.0280 ppm - 0.0312 ppm |
| 2019 | 0.0308 ppm | 4 | 4 | 0.0213 ppm - 0.0368 ppm |
| 2020 | 0.0254 ppm | 4 | 3 | ND - 0.0411 ppm |
| 2021 | 0.0319 ppm | 5 | 4 | ND - 0.0534 ppm |
| 2022 | 0.0671 ppm | 5 | 5 | 0.0203 ppm - 0.130 ppm |
| 2023 | 0.0525 ppm | 5 | 5 | 0.0203 ppm - 0.0965 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 |
|---|---|---|
| 2018-08-08 | Q1831717008 | 0.0280 ppm |
| 2018-08-08 | Q1831717010 | 0.0281 ppm |
| 2018-08-08 | Q1831717018 | 0.0312 ppm |
| 2018-08-08 | Q1831717007 | 0.0285 ppm |
| 2019-05-01 | Q1917515007 | 0.0368 ppm |
| 2019-05-01 | Q1917515008 | 0.0213 ppm |
| 2019-05-01 | Q1917515020 | 0.0296 ppm |
| 2019-05-01 | Q1917515021 | 0.0354 ppm |
| 2020-09-21 | Q2037371011 | ND |
| 2020-11-24 | Q2046890021 | 0.0411 ppm |
| 2020-11-24 | Q2046890025 | 0.0403 ppm |
| 2020-11-24 | Q2046890026 | 0.0203 ppm |
| 2021-03-17 | Q2106984005 | 0.0466 ppm |
| 2021-03-17 | Q2106984006 | 0.0382 ppm |
| 2021-03-17 | Q2106984004 | ND |
| 2021-06-01 | Q2114022018 | 0.0534 ppm |
| 2021-06-01 | Q2114022019 | 0.0213 ppm |
| 2022-02-22 | Q2206242004 | 0.0427 ppm |
| 2022-02-22 | Q2206242005 | 0.0203 ppm |
| 2022-11-03 | Q2233476007 | 0.106 ppm |
| 2022-11-03 | Q2233476008 | 0.130 ppm |
| 2022-11-03 | Q2233476016 | 0.0363 ppm |
| 2023-01-11 | Q2301770001 | 0.0393 ppm |
| 2023-04-05 | Q2312645001 | 0.0203 ppm |
| 2023-10-11 | Q2343453012 | 0.0309 ppm |
| 2023-10-11 | Q2343453013 | 0.0756 ppm |
| 2023-10-11 | Q2343453014 | 0.0965 ppm |