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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

Mesa Water District

1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff. Read More.

Animal studies show that 1,4-dioxane can target the liver, kidneys and respiratory system, and that prenatal exposure can harm the developing fetus. The State of California has set a Public Heatlh Goal of no more than 1 part per billion of 1,4-dioxane in drinking water. The state of Massachusetts sets a legal limit of 0.3 ppb, and New Hampshire's limit is 3 parts per billion. There is no national drinking water standard for this contaminant.

Click here to read more about 1,4-dioxane.

MORE ABOUT THIS CONTAMINANT

 

134

Samples

0

Samples exceeding legal limit (MCL)

91

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND10ND
20142.58 ppb3224ND - 7.50 ppb
20152.30 ppb1712ND - 5.00 ppb
20161.78 ppb2014ND - 5.00 ppb
20171.90 ppb2215ND - 3.60 ppb
20181.55 ppb2114ND - 3.70 ppb
20191.57 ppb2114ND - 4.00 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.35 ppb

The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2013-09-033010004823-3ND
2014-01-063010004824-12.07 ppb
2014-01-063010004822-10.110 ppb
2014-01-063010004825-1ND
2014-01-063010004812-15.42 ppb
2014-01-063010004807-12.42 ppb
2014-01-063010004813-13.98 ppb
2014-02-244417-006-08102.00 ppb
2014-02-244417-007-10454.30 ppb
2014-02-244417-008-10256.20 ppb
2014-02-244417-010-1130ND
2014-04-244417-014-1145ND
2014-05-054417-006-07502.80 ppb
2014-05-054417-007-09154.80 ppb
2014-05-054417-008-08307.50 ppb
2014-05-054417-012-0900ND
2014-05-054417-014-0930ND
2014-06-093010004824-22.15 ppb
2014-06-093010004825-2ND
2014-06-093010004812-24.06 ppb
2014-06-093010004807-22.12 ppb
2014-06-093010004822-20.106 ppb
2014-06-093010004813-23.88 ppb
2014-08-044417-006-08051.80 ppb
2014-08-044417-007-09303.20 ppb
2014-08-044417-008-08254.10 ppb
2014-08-254417-008-08055.60 ppb
2014-08-254417-008-08205.20 ppb
2014-09-024417-014-1015ND
2014-09-154417-010-0905ND
2014-11-034417-007-10202.70 ppb
2014-11-034417-008-10053.90 ppb
2014-11-244417-006-07402.10 ppb
2015-02-094417-007-08303.20 ppb
2015-02-094417-008-07454.80 ppb
2015-02-094417-010-1035ND
2015-03-234417-014-0815ND
2015-03-244417-006-08301.60 ppb
2015-05-114417-006-10301.60 ppb
2015-05-114417-007-08503.50 ppb
2015-05-114417-008-10104.80 ppb
2015-05-114417-012-0930ND
2015-08-104417-006-08351.60 ppb
2015-08-104417-007-09203.60 ppb
2015-08-104417-008-08154.50 ppb
2015-08-104417-010-1010ND
2015-08-104417-014-0950ND
2015-11-024417-006-07501.50 ppb
2015-11-024417-007-08303.40 ppb
2015-11-024417-008-07305.00 ppb
2016-02-014417-006-09402.20 ppb
2016-02-014417-008-10354.30 ppb
2016-02-084417-007-09452.50 ppb
2016-02-104417-010-1025ND
2016-05-094417-006-09501.30 ppb
2016-05-094417-007-10352.60 ppb
2016-05-094417-008-09303.90 ppb
2016-05-094417-010-1100ND
2016-05-094417-012-1015ND
2016-05-114417-014-0820ND
2016-06-164417-006-09401.10 ppb
2016-08-084417-006-10201.10 ppb
2016-08-084417-007-10452.10 ppb
2016-08-084417-008-10053.30 ppb
2016-08-084417-010-1145ND
2016-08-084417-014-1130ND
2016-09-204417-006-09151.40 ppb
2016-10-034417-006-07101.50 ppb
2016-11-144417-007-08353.20 ppb
2016-11-144417-008-08005.00 ppb
2017-02-074417-007-08252.80 ppb
2017-02-074417-008-08003.60 ppb
2017-02-094417-014-0745ND
2017-02-214417-040-08503.60 ppb
2017-02-214417-040-08553.40 ppb
2017-03-014417-040-07103.60 ppb
2017-03-014417-040-07203.50 ppb
2017-03-154417-010-0815ND
2017-03-274417-010-0900ND
2017-05-084417-008-08103.40 ppb
2017-05-084417-010-1015ND
2017-05-084417-012-0850ND
2017-05-084417-040-09302.70 ppb
2017-06-204417-006-08101.60 ppb
2017-08-104417-006-08001.70 ppb
2017-08-104417-008-08352.20 ppb
2017-08-104417-014-0855ND
2017-08-244417-010-0805ND
2017-08-244417-040-08352.60 ppb
2017-10-024417-040-08102.30 ppb
2017-10-124417-007-08103.20 ppb
2017-10-304417-006-07401.60 ppb
2018-03-074417-006-09251.20 ppb
2018-03-074417-007-10352.20 ppb
2018-03-074417-014-1105ND
2018-03-154417-010-0810ND
2018-04-174417-006-08101.000 ppb
2018-04-174417-007-09302.00 ppb
2018-04-174417-012-0910ND
2018-05-234417-014-0750ND
2018-05-314417-010-1430ND
2018-06-054417-006-08201.10 ppb
2018-07-094417-006-08201.40 ppb
2018-08-084417-007-09402.30 ppb
2018-08-084417-008-08403.70 ppb
2018-08-084417-008-08453.50 ppb
2018-08-084417-014-0750ND
2018-08-084417-040-08153.00 ppb
2018-08-094417-010-1310ND
2018-10-224417-006-08151.40 ppb
2018-10-224417-007-09052.40 ppb
2018-10-314417-008-08203.60 ppb
2018-10-314417-008-08303.70 ppb
2019-02-114417-006-08251.30 ppb
2019-02-114417-007-09252.40 ppb
2019-02-114417-008-08003.60 ppb
2019-02-264417-012-0950ND
2019-03-144417-010-0750ND
2019-03-144417-014-0810ND
2019-05-204417-006-08201.30 ppb
2019-05-204417-007-09252.60 ppb
2019-05-204417-008-08504.00 ppb
2019-05-204417-010-0955ND
2019-05-294417-014-0810ND
2019-07-094417-006-09501.30 ppb
2019-07-294417-007-09302.10 ppb
2019-07-294417-008-08553.30 ppb
2019-07-294417-010-1010ND
2019-07-294417-040-07501.90 ppb
2019-09-054417-014-0810ND
2019-10-244417-006-08451.20 ppb
2019-10-294417-007-10252.30 ppb
2019-10-294417-008-10053.40 ppb
2019-10-314417-040-08302.30 ppb