EWG's Tap Water Database — 2019 UPDATE



East Fork SUD

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
20120.353 ppm220.265 ppm - 0.440 ppm
20130.0743 ppm220.0465 ppm - 0.102 ppm
20141.30 ppm221.19 ppm - 1.41 ppm
20151.11 ppm221.02 ppm - 1.20 ppm
20160.549 ppm220.542 ppm - 0.556 ppm
20170.115 ppm220.112 ppm - 0.118 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
2012-06-0412061110010.265 ppm
2012-06-0412061110020.440 ppm
2013-07-25Q13044030030.102 ppm
2013-07-25Q13044030040.0465 ppm
2014-04-14Q14116740041.41 ppm
2014-04-14Q14116740011.19 ppm
2015-01-28Q15033380011.20 ppm
2015-01-28Q15033380021.02 ppm
2016-04-25Q16164470010.556 ppm
2016-04-25Q16164470020.542 ppm
2017-10-18Q17538960030.112 ppm
2017-10-18Q17538960010.118 ppm