Nitrate
South Grayson Special 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 |
|---|---|---|---|---|
| 2014 | 0.143 ppm | 4 | 4 | 0.0515 ppm - 0.409 ppm |
| 2015 | 0.165 ppm | 4 | 4 | 0.0410 ppm - 0.404 ppm |
| 2016 | 0.144 ppm | 4 | 4 | 0.0500 ppm - 0.402 ppm |
| 2017 | 0.118 ppm | 5 | 5 | 0.0376 ppm - 0.372 ppm |
| 2018 | 0.120 ppm | 5 | 5 | 0.0427 ppm - 0.371 ppm |
| 2019 | 0.156 ppm | 5 | 5 | 0.0526 ppm - 0.401 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
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 |
|---|---|---|
| 2014-07-29 | Q1431739004 | 0.0565 ppm |
| 2014-07-29 | Q1431739003 | 0.409 ppm |
| 2014-07-29 | Q1431739002 | 0.0560 ppm |
| 2014-07-29 | Q1431739001 | 0.0515 ppm |
| 2015-04-08 | Q1512852017 | 0.0410 ppm |
| 2015-04-08 | Q1512852015 | 0.0425 ppm |
| 2015-04-08 | Q1512852014 | 0.404 ppm |
| 2015-04-08 | Q1512852011 | 0.172 ppm |
| 2016-10-19 | Q1644668015 | 0.0560 ppm |
| 2016-10-19 | Q1644668014 | 0.0685 ppm |
| 2016-10-19 | Q1644668013 | 0.402 ppm |
| 2016-10-19 | Q1644668012 | 0.0500 ppm |
| 2017-08-07 | Q1732976007 | 0.0600 ppm |
| 2017-12-05 | Q1762919032 | 0.0595 ppm |
| 2017-12-05 | Q1762919011 | 0.0600 ppm |
| 2017-12-05 | Q1762919010 | 0.372 ppm |
| 2017-12-05 | Q1762919009 | 0.0376 ppm |
| 2018-02-06 | Q1804974008 | 0.0450 ppm |
| 2018-10-15 | Q1840862005 | 0.0970 ppm |
| 2018-10-15 | Q1840862017 | 0.371 ppm |
| 2018-10-15 | Q1840862016 | 0.0427 ppm |
| 2018-10-15 | Q1840862004 | 0.0467 ppm |
| 2019-08-13 | Q1954236003 | 0.0526 ppm |
| 2019-08-13 | Q1954236009 | 0.0528 ppm |
| 2019-08-13 | Q1954236006 | 0.0623 ppm |
| 2019-08-13 | Q1954236005 | 0.211 ppm |
| 2019-08-13 | Q1954236004 | 0.401 ppm |