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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

California Water Service Company - Dominguez

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.

 

54

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
2013ND90ND
2014ND300ND
2015ND50ND
2016ND20ND
2017ND10ND

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
2012-09-139590-024-0949ND
2012-09-139590-023-1059ND
2012-09-139590-004-1020ND
2012-09-139590-036-1121ND
2012-09-139590-016-1041ND
2012-09-139590-019-0927ND
2012-09-139590-018-1009ND
2013-09-109590-036-1340ND
2013-09-119590-050-1445ND
2013-09-119590-022-1445ND
2013-09-189590-018-1240ND
2013-09-189590-016-1335ND
2013-09-189590-019-1120ND
2013-09-189590-023-1420ND
2013-09-199590-004-1433ND
2013-09-259590-024-1100ND
2014-04-02201404030191AMND
2014-04-02201404030216AMND
2014-04-02201404030200AMND
2014-04-09201404100040AMND
2014-04-09201404100022AMND
2014-04-09201404100050AMND
2014-04-16201404161018AMND
2014-04-16201404161016AMND
2014-04-16201404161007AMND
2014-07-09201407100243AMND
2014-07-16201407160952AMND
2014-07-16201407160936AMND
2014-07-17201407170901AMND
2014-07-17201407170892AMND
2014-09-039590-050-1435ND
2014-09-039590-004-1135ND
2014-09-049590-036-1105ND
2014-09-049590-024-1020ND
2014-09-049590-023-1357ND
2014-09-049590-019-0940ND
2014-09-049590-018-1334ND
2014-09-249590-016-1424ND
2014-10-01201410010676AMND
2014-10-01201410010697AMND
2014-10-15201410160154AMND
2014-10-15201410160130AMND
2014-10-15201410160145AMND
2014-10-22201410220558AMND
2014-10-22201410220544AMND
2014-10-31201410310233AMND
2015-01-07201501070703AMND
2015-01-07201501080021AMND
2015-01-08201501080797AMND
2015-01-14201501141021AMND
2015-01-14201501141134AMND
2016-03-239590-018-1340ND
2016-12-289590-019-0930ND
2017-03-089590-019-1430ND