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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Mesa Water District

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

 

75

Samples

0

Samples exceeding legal limit (MCL)

44

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.697 ppm118ND - 1.29 ppm
20150.356 ppm94ND - 1.11 ppm
20160.565 ppm158ND - 1.26 ppm
20170.738 ppm1610ND - 1.85 ppm
20180.796 ppm107ND - 1.63 ppm
20190.519 ppm147ND - 1.20 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
2014-02-244417-008-10250.678 ppm
2014-02-244417-007-10450.858 ppm
2014-02-244417-006-08101.13 ppm
2014-05-054417-014-0930ND
2014-05-054417-012-0900ND
2014-05-054417-010-0945ND
2014-05-054417-008-08300.610 ppm
2014-05-054417-006-07500.983 ppm
2014-08-044417-007-09300.858 ppm
2014-08-044417-006-08051.29 ppm
2014-11-244417-006-07401.27 ppm
2015-02-094417-008-07450.678 ppm
2015-02-094417-007-08300.723 ppm
2015-03-244417-006-08301.11 ppm
2015-04-134417-014-0705ND
2015-04-134417-010-0715ND
2015-05-114417-012-0930ND
2015-05-114417-008-10100.694 ppm
2015-08-104417-014-0950ND
2015-08-104417-010-1010ND
2016-02-014417-006-09401.26 ppm
2016-02-084417-007-09450.810 ppm
2016-02-104417-010-1025ND
2016-05-094417-012-1015ND
2016-05-094417-010-1100ND
2016-05-094417-007-10350.880 ppm
2016-05-114417-014-0820ND
2016-06-064417-008-08150.740 ppm
2016-06-164417-014-0900ND
2016-06-164417-006-09401.22 ppm
2016-08-084417-006-10201.25 ppm
2016-08-154417-012-1050ND
2016-08-154417-012-1040ND
2016-09-204417-006-09151.18 ppm
2016-10-034417-006-07101.14 ppm
2017-02-094417-014-0745ND
2017-02-214417-040-08500.520 ppm
2017-03-154417-010-0815ND
2017-05-084417-010-1015ND
2017-05-084417-008-08100.880 ppm
2017-05-084417-040-09300.440 ppm
2017-05-084417-012-0850ND
2017-06-204417-006-08101.85 ppm
2017-07-124417-006-12351.55 ppm
2017-07-124417-006-11001.54 ppm
2017-08-104417-006-08001.44 ppm
2017-08-244417-040-0835ND
2017-10-024417-040-0810ND
2017-10-124417-007-08100.990 ppm
2017-10-304417-006-07401.67 ppm
2017-11-094417-007-07400.920 ppm
2018-03-074417-007-10350.870 ppm
2018-03-074417-006-09251.36 ppm
2018-03-074417-006-09401.36 ppm
2018-04-174417-006-08101.40 ppm
2018-04-174417-012-0910ND
2018-05-234417-014-0750ND
2018-05-314417-010-1430ND
2018-06-054417-006-08201.63 ppm
2018-08-084417-040-08150.460 ppm
2018-08-084417-008-08400.880 ppm
2019-02-114417-006-08251.20 ppm
2019-02-264417-012-0950ND
2019-05-134417-040-0840ND
2019-05-134417-012-0910ND
2019-05-204417-010-0955ND
2019-05-204417-007-09250.750 ppm
2019-05-204417-008-08501.09 ppm
2019-05-294417-014-0810ND
2019-06-274417-006-13001.19 ppm
2019-07-294417-008-08551.10 ppm
2019-07-294417-007-09300.740 ppm
2019-07-294417-012-0820ND
2019-07-294417-010-1005ND
2019-10-244417-006-08401.20 ppm