EWG's Tap Water Database — 2021 UPDATE



Duck River Utility Commission

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
20140.710 ppm110.710 ppm
20150.845 ppm110.845 ppm
20160.709 ppm110.709 ppm
20170.757 ppm110.757 ppm
20180.270 ppm110.270 ppm
20190.736 ppm110.736 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 Result
2014-02-050.710 ppm
2015-02-120.845 ppm
2016-02-030.709 ppm
2017-01-260.757 ppm
2018-03-060.270 ppm
2019-02-060.736 ppm