EWG's Tap Water Database — 2021 UPDATE



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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
20140.480 ppm110.480 ppm
20150.510 ppm110.510 ppm
20160.490 ppm110.490 ppm
20170.540 ppm110.540 ppm
20180.600 ppm110.600 ppm
20190.500 ppm110.500 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
2014-11-30201412010135I0.480 ppm
2015-09-30201510010035I0.510 ppm
2016-09-20201609210082I0.490 ppm
2017-09-28201709290172I0.540 ppm
2018-12-03201812040071I0.600 ppm
2019-11-13201911140271I0.500 ppm