EWG's Tap Water Database — 2019 UPDATE



Boone-florence Water Commission

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
20120.756 ppm13130.498 ppm - 1.07 ppm
20130.795 ppm12120.480 ppm - 1.03 ppm
20140.895 ppm13130.650 ppm - 1.43 ppm
20150.872 ppm17170.380 ppm - 1.55 ppm
20160.798 ppm12120.530 ppm - 1.51 ppm
20170.901 ppm18180.550 ppm - 1.39 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