EWG's Tap Water Database — 2021 UPDATE



Nashville Water Department #1

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
20140.505 ppm330.480 ppm - 0.544 ppm
20150.509 ppm330.497 ppm - 0.516 ppm
20160.446 ppm330.441 ppm - 0.455 ppm
20170.333 ppm330.266 ppm - 0.413 ppm
20180.464 ppm330.452 ppm - 0.484 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
2014-03-110.490 ppm
2014-03-110.544 ppm
2014-03-110.480 ppm
2015-03-100.516 ppm
2015-03-100.497 ppm
2015-03-100.514 ppm
2016-01-120.441 ppm
2016-01-120.443 ppm
2016-01-120.455 ppm
2017-03-150.413 ppm
2017-03-150.266 ppm
2017-03-150.320 ppm
2018-03-190.455 ppm
2018-03-190.452 ppm
2018-03-190.484 ppm
2019-03-190.457 ppm
2019-03-190.478 ppm
2019-03-190.457 ppm
2019-03-190.458 ppm
2019-03-190.458 ppm
2019-03-190.478 ppm