Nitrate
City of La Porte
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 | 0.367 ppm | 6 | 6 | 0.360 ppm - 0.400 ppm |
| 2015 | 0.332 ppm | 6 | 6 | 0.0700 ppm - 0.390 ppm |
| 2016 | 0.517 ppm | 6 | 6 | 0.480 ppm - 0.680 ppm |
| 2017 | 0.723 ppm | 7 | 7 | 0.600 ppm - 1.03 ppm |
| 2018 | 0.422 ppm | 6 | 6 | 0.410 ppm - 0.430 ppm |
| 2019 | 0.568 ppm | 6 | 6 | 0.560 ppm - 0.570 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 |
|---|---|---|
| 2014-08-22 | AC65068 | 0.360 ppm |
| 2014-08-22 | AC65065 | 0.400 ppm |
| 2014-08-22 | AC65070 | 0.360 ppm |
| 2014-08-22 | AC65066 | 0.360 ppm |
| 2014-08-22 | AC65067 | 0.360 ppm |
| 2014-08-22 | AC65069 | 0.360 ppm |
| 2015-01-26 | AC77474 | 0.380 ppm |
| 2015-01-26 | AC77483 | 0.380 ppm |
| 2015-01-26 | AC77480 | 0.380 ppm |
| 2015-01-26 | AC77482 | 0.390 ppm |
| 2015-01-26 | AC77481 | 0.390 ppm |
| 2015-01-26 | AC77479 | 0.0700 ppm |
| 2016-01-20 | AD18774 | 0.480 ppm |
| 2016-01-20 | AD18775 | 0.500 ppm |
| 2016-01-20 | AD18778 | 0.480 ppm |
| 2016-01-20 | AD18776 | 0.480 ppm |
| 2016-01-20 | AD18777 | 0.480 ppm |
| 2016-04-12 | AD32687 | 0.680 ppm |
| 2017-05-01 | AD81628 | 1.03 ppm |
| 2017-05-01 | AD81652 | 0.600 ppm |
| 2017-05-01 | AD81655 | 0.610 ppm |
| 2017-05-01 | AD81653 | 0.600 ppm |
| 2017-05-01 | AD81656 | 1.01 ppm |
| 2017-05-01 | AD81649 | 0.610 ppm |
| 2017-05-01 | AD81654 | 0.600 ppm |
| 2018-01-29 | AE10837 | 0.430 ppm |
| 2018-01-29 | AE10836 | 0.430 ppm |
| 2018-01-29 | AE10838 | 0.410 ppm |
| 2018-01-29 | AE10840 | 0.410 ppm |
| 2018-01-29 | AE10835 | 0.430 ppm |
| 2018-01-29 | AE10839 | 0.420 ppm |
| 2019-01-09 | AE49120 | 0.570 ppm |
| 2019-01-09 | AE49117 | 0.570 ppm |
| 2019-01-09 | AE49116 | 0.570 ppm |
| 2019-01-09 | AE49115 | 0.570 ppm |
| 2019-01-09 | AE49119 | 0.560 ppm |
| 2019-01-09 | AE49118 | 0.570 ppm |