EWG's Tap Water Database — 2019 UPDATE


Nitrate and nitrite

City of Cedar Hill

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. 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
20130.113 ppm110.113 ppm
20140.399 ppm220.398 ppm - 0.399 ppm
20150.485 ppm330.0105 ppm - 0.729 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2012-09-1312094550010.495 ppm
2012-09-1312094550020.505 ppm
2012-09-1312094550030.415 ppm
2013-03-2713039540010.113 ppm
2014-09-18Q14456800010.399 ppm
2014-09-18Q14456800020.398 ppm
2015-06-04Q15204550010.716 ppm
2015-06-04Q15204550020.729 ppm
2015-08-18Q15326150010.0105 ppm