Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Nitrate

Tempe Water Supply Corporation 1

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0275 ppm440.01000 ppm - 0.0400 ppm
20130.0375 ppm440.0200 ppm - 0.0500 ppm
20140.0300 ppm43ND - 0.0600 ppm
20150.0325 ppm440.0200 ppm - 0.0500 ppm
20160.0375 ppm440.0300 ppm - 0.0500 ppm
20170.0375 ppm440.0300 ppm - 0.0600 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
2012-02-29AB822590.0400 ppm
2012-02-29AB822650.0300 ppm
2012-02-29AB822630.0300 ppm
2012-02-29AB822620.01000 ppm
2013-02-26AC114770.0500 ppm
2013-02-26AC114750.0200 ppm
2013-02-26AC114760.0300 ppm
2013-02-26AC114710.0500 ppm
2014-01-15AC389480.0600 ppm
2014-01-15AC389180.0300 ppm
2014-01-15AC38913ND
2014-01-15AC389120.0300 ppm
2015-02-24AC815810.0300 ppm
2015-02-24AC815780.0500 ppm
2015-02-24AC815790.0200 ppm
2015-02-24AC815430.0300 ppm
2016-02-25AD255550.0300 ppm
2016-02-25AD255570.0400 ppm
2016-02-25AD255560.0300 ppm
2016-02-25AD255580.0500 ppm
2017-02-15AD707260.0300 ppm
2017-02-15AD707250.0300 ppm
2017-02-15AD707420.0600 ppm
2017-06-01AD862680.0300 ppm