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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

City of Seal Beach

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND90ND
2014ND40ND
2015ND20ND
2016ND20ND
2017ND20ND

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
2012-01-244417-002-0800ND
2012-01-244417-001-0820ND
2012-02-144417-009-0800ND
2012-05-094417-003-0740ND
2013-02-064417-002-0825ND
2013-02-074417-009-1410ND
2013-02-274417-001-0835ND
2013-06-103010041805-2ND
2013-08-073010041804-2ND
2013-08-073010041806-2ND
2013-09-033010041805-3ND
2013-10-304417-003-0800ND
2013-12-034417-003-0810ND
2014-01-304417-001-0930ND
2014-01-304417-002-0900ND
2014-01-304417-009-0955ND
2014-02-254417-003-0740ND
2015-01-204417-002-0830ND
2015-01-204417-009-0805ND
2016-01-274417-009-0910ND
2016-01-274417-002-0930ND
2017-01-124417-009-0835ND
2017-01-124417-002-0815ND