EWG's Tap Water Database



Farmington City Water System

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
20100.667 ppm330.200 ppm - 1.000 ppm
20110.525 ppm43ND - 0.900 ppm
20120.567 ppm330.300 ppm - 1.000 ppm
20130.625 ppm43ND - 1.20 ppm
20140.450 ppm43ND - 1.10 ppm
20150.575 ppm43ND - 1.10 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

Health Guideline 0.14 ppm

The health guideline of 0.14 ppm for nitrate was defined in a peer-reviewed scientific study by EWG and corresponds to one-in-one-million annual cancer risk level.

ppm = parts per million.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)10 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Result
2010-06-080.800 ppm
2010-06-080.200 ppm
2010-06-081.000 ppm
2011-04-190.900 ppm
2011-04-190.900 ppm
2011-04-190.300 ppm
2012-03-150.400 ppm
2012-03-151.000 ppm
2012-03-150.300 ppm
2013-11-051.20 ppm
2013-11-050.200 ppm
2013-11-061.10 ppm
2014-02-270.500 ppm
2014-02-270.200 ppm
2014-02-271.10 ppm
2015-03-101.000 ppm
2015-03-101.10 ppm
2015-03-100.200 ppm