Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Nitrate

South Island PSD

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.

MORE ABOUT THIS CONTAMINANT

 

72

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.00750 ppm122ND - 0.0520 ppm
2015ND120ND
2016ND120ND
2017ND120ND
2018ND120ND
2019ND120ND

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
2014-02-04AD35232ND
2014-02-04AD35252ND
2014-02-04AD35253ND
2014-02-04AD35231ND
2014-02-10AD35465ND
2014-02-10AD35468ND
2014-02-10AD35474ND
2014-02-10AD35475ND
2014-04-14AD383600.0520 ppm
2014-04-14AD38376ND
2014-04-14AD383740.0380 ppm
2014-04-14AD38363ND
2015-03-05AD52399ND
2015-03-05AD52400ND
2015-03-05AD52398ND
2015-03-05AD52397ND
2015-03-05AD52396ND
2015-03-05AD52394ND
2015-03-05AD52393ND
2015-03-05AD52392ND
2015-03-05AD52390ND
2015-03-05AD52391ND
2015-03-05AD52395ND
2015-09-21AD61290ND
2016-03-14AD72485ND
2016-03-14AD72491ND
2016-03-14AD72490ND
2016-03-14AD72489ND
2016-03-14AD72488ND
2016-03-14AD72487ND
2016-03-14AD72486ND
2016-03-14AD72484ND
2016-03-14AD72483ND
2016-03-14AD72482ND
2016-03-14AD72481ND
2016-03-14AD72480ND
2017-01-26AD88867ND
2017-01-26AD88868ND
2017-01-26AD88859ND
2017-01-26AD88869ND
2017-01-26AD88856ND
2017-01-26AD88865ND
2017-01-26AD88858ND
2017-01-26AD88866ND
2017-01-26AD88864ND
2017-01-26AD88863ND
2017-01-26AD88857ND
2017-01-26AD88870ND
2018-02-15AE07886ND
2018-02-15AE07885ND
2018-02-15AE07884ND
2018-02-15AE07883ND
2018-11-14AE21360ND
2018-11-14AE21359ND
2018-11-14AE21358ND
2018-11-14AE21357ND
2018-11-14AE21356ND
2018-11-14AE21354ND
2018-11-14AE21355ND
2018-12-18AE23257ND
2019-01-24AE24552ND
2019-01-24AE24549ND
2019-01-24AE24550ND
2019-01-24AE24558ND
2019-01-24AE24557ND
2019-01-24AE24556ND
2019-01-24AE24555ND
2019-01-24AE24554ND
2019-01-24AE24553ND
2019-01-24AE24551ND
2019-02-22AE26216ND
2019-02-22AE26215ND