EWG's Tap Water Database — 2019 UPDATE



City of Parsons

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
20121.15 ppm221.10 ppm - 1.20 ppm
20130.600 ppm220.560 ppm - 0.640 ppm
20150.480 ppm220.370 ppm - 0.590 ppm
20160.435 ppm220.420 ppm - 0.450 ppm
20170.935 ppm220.930 ppm - 0.940 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
2012-05-08578571WS1.20 ppm
2012-05-23579243BT1.10 ppm
2013-05-20596302WS0.560 ppm
2013-06-12597162BT0.640 ppm
2015-05-113308290.590 ppm
2015-05-193351030.370 ppm
2016-05-035374310.450 ppm
2016-05-095405020.420 ppm
2017-05-097589850.940 ppm
2017-05-097589080.930 ppm