EWG's Tap Water Database — 2019 UPDATE



City of Hewitt

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
20120.0420 ppm550.0400 ppm - 0.0500 ppm
20130.0875 ppm330.0745 ppm - 0.110 ppm
20140.600 ppm330.570 ppm - 0.620 ppm
20150.0633 ppm330.0500 ppm - 0.0700 ppm
20160.103 ppm330.0500 ppm - 0.190 ppm
20170.0867 ppm330.0700 ppm - 0.110 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
2012-01-12AB776520.0400 ppm
2012-01-12AB776500.0400 ppm
2012-01-12AB776490.0500 ppm
2012-01-12AB776480.0400 ppm
2012-01-12AB776510.0400 ppm
2013-02-1213023960010.110 ppm
2013-07-25Q13044650060.0745 ppm
2013-07-25Q13044650010.0780 ppm
2014-01-14AC386630.610 ppm
2014-01-14AC386620.570 ppm
2014-01-14AC386610.620 ppm
2015-03-23AC855290.0500 ppm
2015-03-23AC855280.0700 ppm
2015-03-23AC855270.0700 ppm
2016-01-20AD188190.0500 ppm
2016-01-20AD188080.0700 ppm
2016-04-06AD319580.190 ppm
2017-04-03AD779530.0700 ppm
2017-10-09AD996950.110 ppm
2017-10-31AE031120.0800 ppm