EWG's Tap Water Database — 2019 UPDATE



Cherry Creek Valley WSD

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
20120.0891 ppm11110.0200 ppm - 0.140 ppm
20130.171 ppm1413ND - 0.660 ppm
20140.0700 ppm880.0400 ppm - 0.1000 ppm
20150.0833 ppm330.0500 ppm - 0.110 ppm
20160.0833 ppm330.0300 ppm - 0.130 ppm
20170.0830 ppm10100.0200 ppm - 0.180 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 Result