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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

City of Mesa

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.00947 ppb571ND - 0.540 ppb
2014ND30ND
2015ND10ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A

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
2013-01-15201301160554AMND
2013-01-15201301160548AMND
2013-01-16201301160564AMND
2013-01-16201301160562AMND
2013-01-16201301160566AMND
2013-01-22201301240152AMND
2013-01-22201301240172AMND
2013-02-12201302140546AMND
2013-02-12201302140542AMND
2013-02-12201302140544AMND
2013-02-13201302140531AMND
2013-02-13201302140535AMND
2013-02-13201302140529AMND
2013-02-13201302140533AMND
2013-04-09201304100481AMND
2013-04-09201304100479AMND
2013-04-09201304100477AMND
2013-04-10201304110544AMND
2013-04-10201304110546AMND
2013-04-10201304110542AMND
2013-04-10201304110540AMND
2013-04-17201304170695AMND
2013-05-09201305100040AMND
2013-05-09201305100038AMND
2013-05-09201305100042AMND
2013-05-09201305100044AMND
2013-05-09201305100046AMND
2013-05-20201305200127AMND
2013-05-20201305200068AMND
2013-07-16201307170508AMND
2013-07-16201307170504AMND
2013-07-16201307170510AMND
2013-07-16201307170506AMND
2013-07-17201307170520AMND
2013-07-17201307170518AMND
2013-07-17201307170516AMND
2013-07-23201307240531AMND
2013-07-24201307240544AMND
2013-08-06201308070586AMND
2013-08-06201308070584AM0.540 ppb
2013-08-06201308070588AMND
2013-08-07201308070590AMND
2013-08-14201308140392AMND
2013-08-14201308140394AMND
2013-10-08201310080614AMND
2013-10-08201310080612AMND
2013-10-08201310080616AMND
2013-10-08201310080610AMND
2013-10-09201310090511AMND
2013-10-09201310090513AMND
2013-10-15201310150503AMND
2013-11-05201311050403AMND
2013-11-05201311050401AMND
2013-11-06201311070298AMND
2013-11-06201311070294AMND
2013-11-06201311070296AMND
2013-11-06201311070300AMND
2014-03-25201403250419AMND
2014-06-04201406040576AMND
2014-09-02201409020217AMND
2015-01-21201501220204AMND