EWG's Tap Water Database — 2019 UPDATE



City of Edmond - Arcadia Lake

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
20120.867 ppm13130.340 ppm - 1.84 ppm
20130.635 ppm660.500 ppm - 0.880 ppm
20150.419 ppm110.419 ppm
20170.550 ppm330.460 ppm - 0.680 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
2012-11-082K08039-021.79 ppm
2012-11-302K30009-050.790 ppm
2012-11-302K30009-040.890 ppm
2012-11-302K30009-031.01 ppm
2012-11-302K30009-010.340 ppm
2012-12-102L10028-050.530 ppm
2012-12-102L10028-040.720 ppm
2012-12-102L10028-030.710 ppm
2012-12-102L10028-020.620 ppm
2012-12-102L10028-010.790 ppm
2012-12-212L21012-021.84 ppm
2012-12-212L21012-030.580 ppm
2012-12-212L21012-010.660 ppm
2013-12-053L05039-040.880 ppm
2013-12-053L05039-030.500 ppm
2013-12-053L05039-020.660 ppm
2013-12-053L05039-010.500 ppm
2013-12-103L10006-020.710 ppm
2013-12-103L10006-010.560 ppm
2015-03-3013828340.419 ppm
2017-03-207C20037-010.460 ppm
2017-03-217C21038-040.680 ppm
2017-03-217C21038-050.510 ppm