EWG's Tap Water Database — 2019 UPDATE



Shawnee County RWD 4C

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
20120.265 ppm21ND - 0.530 ppm
20130.665 ppm220.520 ppm - 0.810 ppm
20140.255 ppm42ND - 0.710 ppm
20150.470 ppm220.360 ppm - 0.580 ppm
20160.755 ppm220.660 ppm - 0.850 ppm
20170.968 ppm440.470 ppm - 1.20 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
2012-07-02580686BT0.530 ppm
2013-07-03598021BT0.810 ppm
2013-07-03598020BT0.520 ppm
2014-04-14952330.710 ppm
2014-04-14952320.310 ppm
2015-06-293552030.360 ppm
2015-06-293552100.580 ppm
2016-06-225672850.850 ppm
2016-06-225672840.660 ppm
2017-04-107360901.20 ppm
2017-04-107360891.20 ppm
2017-06-197804781.000 ppm
2017-06-197804790.470 ppm