EWG's Tap Water Database — 2019 UPDATE



Mitchell County Rural Water District 2

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
20120.490 ppm220.470 ppm - 0.510 ppm
20130.115 ppm21ND - 0.230 ppm
20140.0650 ppm21ND - 0.130 ppm
20150.160 ppm21ND - 0.320 ppm
20162.18 ppm220.150 ppm - 4.20 ppm
20170.280 ppm220.190 ppm - 0.370 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
2012-03-27576781BT0.470 ppm
2012-05-07578504WS0.510 ppm
2013-05-14596069WS0.230 ppm
2014-03-17792110.130 ppm
2015-04-203158010.320 ppm
2016-03-215124694.20 ppm
2016-04-185297240.150 ppm
2017-03-207268940.190 ppm
2017-04-177430970.370 ppm