EWG's Tap Water Database — 2021 UPDATE



Tennessee American Water

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
20140.270 ppm330.120 ppm - 0.440 ppm
20150.370 ppm220.370 ppm
20160.275 ppm220.120 ppm - 0.430 ppm
20170.400 ppm220.220 ppm - 0.580 ppm
20180.300 ppm220.250 ppm - 0.350 ppm
20190.360 ppm220.230 ppm - 0.490 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
2014-01-200.440 ppm
2014-07-230.120 ppm
2014-10-210.250 ppm
2015-01-120.370 ppm
2015-07-210.370 ppm
2016-01-190.430 ppm
2016-07-130.120 ppm
2017-01-100.580 ppm
2017-07-110.220 ppm
2018-01-150.350 ppm
2018-07-090.250 ppm
2019-01-070.490 ppm
2019-07-010.230 ppm