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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Glendale Water Department

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.

 

45

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
20130.200 ppb61ND - 1.20 ppb
20140.0629 ppb72ND - 0.310 ppb
20150.0808 ppb135ND - 0.300 ppb
2016ND60ND
2017ND50ND

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
2012-01-109590-069-0905ND
2012-01-239590-069-0932ND
2012-04-119590-069-0940ND
2012-06-139590-069-0830ND
2012-07-119590-069-0746ND
2012-08-159590-069-0917ND
2012-10-109590-069-0740ND
2012-12-129590-069-1052ND
2013-02-119590-069-1130ND
2013-04-109590-069-0950ND
2013-06-139590-069-07501.20 ppb
2013-07-109590-069-0904ND
2013-09-119590-069-0835ND
2013-12-119590-069-0850ND
2014-02-129590-069-1048ND
2014-04-099590-069-1040ND
2014-06-119590-069-0933ND
2014-09-109590-069-0847ND
2014-10-20201410200337AM0.310 ppb
2014-10-20201410200329AMND
2014-10-21201410210424AM0.130 ppb
2015-01-06201501060846AM0.120 ppb
2015-01-149590-069-0941ND
2015-03-099590-069-0927ND
2015-04-20201504200148AMND
2015-04-20201504200152AM0.120 ppb
2015-04-20201504200156AM0.300 ppb
2015-04-27201504270136AM0.240 ppb
2015-05-139590-069-0837ND
2015-07-159590-069-0957ND
2015-09-089590-069-1011ND
2015-10-149590-069-0903ND
2015-10-15201510150093AM0.270 ppb
2015-11-109590-069-0715ND
2016-01-139590-069-0931ND
2016-03-099590-069-0927ND
2016-05-119590-069-0901ND
2016-07-139590-069-1017ND
2016-09-149590-069-1051ND
2016-11-109590-069-1057ND
2017-01-129588-069-1003ND
2017-04-139588-069-1017ND
2017-06-129588-069-0847ND
2017-08-109588-069-0921ND
2017-12-159588-069-0823ND