Nitrate
City of South Houston
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 | 0.740 ppm | 5 | 5 | 0.710 ppm - 0.810 ppm |
| 2015 | 0.304 ppm | 5 | 5 | 0.290 ppm - 0.310 ppm |
| 2016 | 0.550 ppm | 5 | 5 | 0.540 ppm - 0.560 ppm |
| 2017 | 0.666 ppm | 5 | 5 | 0.250 ppm - 0.820 ppm |
| 2018 | 0.414 ppm | 5 | 5 | 0.410 ppm - 0.420 ppm |
| 2019 | 0.498 ppm | 5 | 5 | 0.480 ppm - 0.520 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 |
|---|---|---|
| 2014-01-14 | AC38700 | 0.730 ppm |
| 2014-01-14 | AC38701 | 0.730 ppm |
| 2014-01-14 | AC38693 | 0.710 ppm |
| 2014-01-14 | AC38699 | 0.810 ppm |
| 2014-01-14 | AC38702 | 0.720 ppm |
| 2015-01-21 | AC76986 | 0.290 ppm |
| 2015-01-21 | AC76987 | 0.310 ppm |
| 2015-01-21 | AC76985 | 0.300 ppm |
| 2015-01-21 | AC76984 | 0.310 ppm |
| 2015-01-21 | AC76983 | 0.310 ppm |
| 2016-01-14 | AD18075 | 0.540 ppm |
| 2016-01-14 | AD18077 | 0.550 ppm |
| 2016-01-14 | AD18076 | 0.560 ppm |
| 2016-01-14 | AD18074 | 0.540 ppm |
| 2016-01-14 | AD18078 | 0.560 ppm |
| 2017-01-06 | AD63453 | 0.250 ppm |
| 2017-02-10 | AD70241 | 0.660 ppm |
| 2017-03-01 | AD72657 | 0.820 ppm |
| 2017-03-01 | AD72658 | 0.790 ppm |
| 2017-03-01 | AD72656 | 0.810 ppm |
| 2018-01-30 | AE11138 | 0.410 ppm |
| 2018-01-30 | AE11136 | 0.410 ppm |
| 2018-01-30 | AE11137 | 0.410 ppm |
| 2018-01-30 | AE11135 | 0.420 ppm |
| 2018-01-30 | AE11139 | 0.420 ppm |
| 2019-02-05 | AE52785 | 0.500 ppm |
| 2019-02-05 | AE52784 | 0.500 ppm |
| 2019-02-05 | AE52786 | 0.490 ppm |
| 2019-02-05 | AE52787 | 0.520 ppm |
| 2019-02-05 | AE52783 | 0.480 ppm |