EWG's Tap Water Database — 2019 UPDATE



City of Cedar Hill

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
20120.472 ppm330.415 ppm - 0.505 ppm
20130.361 ppm330.113 ppm - 0.490 ppm
20140.278 ppm330.0365 ppm - 0.399 ppm
20150.478 ppm330.0105 ppm - 0.718 ppm
20160.458 ppm330.377 ppm - 0.610 ppm
20170.458 ppm330.0219 ppm - 0.691 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
2012-09-1312094550030.415 ppm
2012-09-1312094550020.505 ppm
2012-09-1312094550010.495 ppm
2013-03-271303A230020.490 ppm
2013-03-271303A230010.480 ppm
2013-03-2713039540010.113 ppm
2014-09-18Q14456800020.398 ppm
2014-09-18Q14456800010.399 ppm
2014-09-25Q14479260020.0365 ppm
2015-06-04Q15204550020.718 ppm
2015-06-04Q15204550010.704 ppm
2015-08-18Q15326150010.0105 ppm
2016-10-07Q16431320070.386 ppm
2016-10-07Q16431320060.377 ppm
2016-10-07Q16431320050.610 ppm
2017-01-11Q17015530020.662 ppm
2017-01-11Q17015530010.691 ppm
2017-08-23Q17378720070.0219 ppm