EWG's Tap Water Database — 2019 UPDATE



City of Grand Prairie

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 exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.512 ppm97ND - 1.62 ppm
20130.810 ppm990.320 ppm - 1.67 ppm
20140.856 ppm12120.398 ppm - 1.45 ppm
20150.598 ppm11110.0295 ppm - 1.28 ppm
20160.556 ppm11110.0740 ppm - 1.10 ppm
20170.658 ppm10100.194 ppm - 1.31 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
2012-03-0712032550021.62 ppm
2012-03-0712032550010.789 ppm
2012-08-1312085430060.220 ppm
2012-08-1312085430010.280 ppm
2012-08-1312085430020.785 ppm
2012-08-1312085430040.0900 ppm
2012-11-0612111720010.825 ppm
2013-02-1913025710010.880 ppm
2013-02-1913025710020.920 ppm
2013-04-291304A100010.320 ppm
2013-04-291304A100020.450 ppm
2013-04-291304A100031.67 ppm
2013-04-291304A100041.15 ppm
2013-04-291304A100050.358 ppm
2013-10-22Q13094420100.743 ppm
2013-10-22Q13094420090.801 ppm
2014-04-23Q14129910040.993 ppm
2014-06-04Q14193310050.996 ppm
2014-06-26Q14240230080.434 ppm
2014-06-26Q14240230091.29 ppm
2014-06-26Q14240230140.554 ppm
2014-06-26Q14240230131.45 ppm
2014-06-26Q14240230150.470 ppm
2014-06-26Q14240230320.805 ppm
2014-06-26Q14240230371.37 ppm
2014-09-10Q14429910010.796 ppm
2014-09-10Q14429910100.398 ppm
2014-09-10Q14429910090.715 ppm
2015-06-09Q15210420030.472 ppm
2015-06-09Q15210390010.868 ppm
2015-07-14Q15268460040.350 ppm
2015-07-14Q15268460030.319 ppm
2015-07-14Q15268460021.28 ppm
2015-07-14Q15268460011.18 ppm
2015-10-07Q15392780010.260 ppm
2015-10-07Q15392780021.09 ppm
2015-10-07Q15392780040.418 ppm
2015-10-07Q15392780030.314 ppm
2015-10-07Q15392780050.0295 ppm
2016-01-14Q16017300040.627 ppm
2016-01-14Q16017300030.860 ppm
2016-01-14Q16017300020.0740 ppm
2016-01-14Q16017300011.10 ppm
2016-03-01Q16086120010.702 ppm
2016-03-01Q16086120020.578 ppm
2016-07-14Q16287120050.107 ppm
2016-07-14Q16287120040.344 ppm
2016-10-05Q16421140040.807 ppm
2016-10-05Q16421140030.376 ppm
2016-12-05Q16525550040.538 ppm
2017-01-05Q17006320240.870 ppm
2017-01-05Q17006320080.546 ppm
2017-06-27Q17265350040.471 ppm
2017-06-27Q17265350291.29 ppm
2017-06-27Q17265350050.561 ppm
2017-06-27Q17265350300.322 ppm
2017-06-27Q17265350060.303 ppm
2017-06-27Q17265350121.31 ppm
2017-08-14Q17352480060.714 ppm
2017-08-14Q17352480010.194 ppm