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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

Oklahoma University

NOTE: Oklahoma University purchases water from Norman which is required to test for 1,4-dioxane. Sample information shown below was taken by Norman.

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

 

54

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015ND30ND
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

NOTE: Oklahoma University purchases water from Norman which is required to test for 1,4-dioxane. Sample information shown below was taken by Norman.

Date Lab ID Result
2013-04-08713272-8632ND
2013-04-08713229-8585ND
2013-04-08713248-8585ND
2013-04-08713324-8632ND
2013-04-08713266-8585ND
2013-04-08713289-8632ND
2013-04-08713252-8585ND
2013-04-08713268-8585ND
2013-04-08713250-8585ND
2013-04-08713225-8585ND
2013-04-08713227-8585ND
2013-04-08713328-8632ND
2013-04-08713242-8585ND
2013-04-08713262-8585ND
2013-04-08713270-8585ND
2013-04-08713258-8585ND
2013-04-08713322-8632ND
2013-04-08713235-8585ND
2013-04-08713308-8632ND
2013-04-08713316-8632ND
2013-04-08713254-8585ND
2013-04-08713304-8632ND
2013-04-08713314-8632ND
2013-04-08713196-8585ND
2013-04-08713199-8585ND
2013-08-14738328-9674ND
2013-08-14738327-9674ND
2013-10-16753429-10160ND
2013-10-16753378-10154ND
2013-10-16753346-10154ND
2013-10-16753427-10160ND
2013-10-16753511-10160ND
2013-10-16753382-10154ND
2013-10-16753350-10154ND
2013-10-16753509-10160ND
2013-10-16753410-10154ND
2013-10-16753386-10154ND
2013-10-16753423-10160ND
2013-10-16753754-10160ND
2013-10-16753421-10160ND
2013-10-16753348-10154ND
2013-10-16753380-10154ND
2013-10-16753397-10154ND
2013-10-16753399-10154ND
2013-10-16753401-10154ND
2013-10-16753418-10154ND
2013-10-16753384-10154ND
2013-10-16753413-10154ND
2013-10-16753352-10154ND
2013-10-16753416-10154ND
2013-10-16753513-10160ND
2013-10-16753425-10160ND
2014-02-11770264-10747ND
2014-02-11770224-10747ND