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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

City of Garden Grove

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

 

138

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.330 ppb2516ND - 1.33 ppb
20140.0632 ppb191ND - 1.20 ppb
2015ND190ND
2016ND180ND
20170.0526 ppb191ND - 1.000 ppb
2018ND200ND
2019ND180ND

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
2013-03-043010062821ND
2013-03-053010062816ND
2013-05-1330100628050.280 ppb
2013-05-133010062802ND
2013-05-1330100628200.710 ppb
2013-05-1430100628130.550 ppb
2013-05-1430100628031.33 ppb
2013-05-1430100628070.700 ppb
2013-05-1530100628110.720 ppb
2013-05-1530100628150.210 ppb
2013-05-1530100628090.540 ppb
2013-06-103010062821-2ND
2013-06-103010062816-2ND
2013-09-033010062816-3ND
2013-09-033010062821-3ND
2013-11-133010062815-20.380 ppb
2013-11-133010062813-20.430 ppb
2013-11-133010062811-20.580 ppb
2013-11-133010062805-20.230 ppb
2013-11-133010062802-20.0700 ppb
2013-11-133010062809-20.460 ppb
2013-11-133010062806-20.480 ppb
2013-11-133010062820-20.580 ppb
2013-12-093010062816-4ND
2013-12-093010062821-4ND
2014-01-084417-009-0835ND
2014-01-084417-011-1100ND
2014-01-084417-012-0955ND
2014-01-084417-013-1435ND
2014-01-084417-014-0740ND
2014-01-084417-016-1220ND
2014-01-084417-018-1125ND
2014-01-084417-019-0810ND
2014-01-084417-020-0755ND
2014-01-084417-039-10401.20 ppb
2014-01-084417-061-0940ND
2014-01-084417-063-1015ND
2014-04-024417-006-1400ND
2014-04-024417-016-1125ND
2014-04-024417-039-1015ND
2014-07-234417-016-1135ND
2014-09-304417-039-1000ND
2014-10-154417-016-1140ND
2014-10-154417-039-0940ND
2015-01-074417-009-0815ND
2015-01-074417-011-1010ND
2015-01-074417-012-0900ND
2015-01-074417-013-1440ND
2015-01-074417-014-0920ND
2015-01-074417-016-1130ND
2015-01-074417-018-1105ND
2015-01-074417-019-0715ND
2015-01-074417-020-0755ND
2015-01-074417-039-1035ND
2015-01-074417-061-0840ND
2015-01-074417-063-0745ND
2015-04-014417-006-1400ND
2015-04-014417-016-1140ND
2015-04-014417-039-1000ND
2015-07-224417-016-1140ND
2015-07-224417-039-0940ND
2015-10-144417-016-1135ND
2015-10-144417-039-0940ND
2016-01-064417-009-0800ND
2016-01-064417-011-1005ND
2016-01-064417-012-0845ND
2016-01-064417-013-1150ND
2016-01-064417-014-0920ND
2016-01-064417-016-1045ND
2016-01-064417-018-1115ND
2016-01-064417-019-0735ND
2016-01-064417-020-0715ND
2016-01-064417-039-0940ND
2016-01-064417-061-0830ND
2016-01-064417-063-0700ND
2016-04-274417-016-1115ND
2016-04-274417-039-0950ND
2016-07-204417-016-1110ND
2016-07-204417-039-0950ND
2016-10-124417-016-1115ND
2016-10-124417-039-0940ND
2017-02-014417-009-0820ND
2017-02-014417-012-0915ND
2017-02-014417-013-1150ND
2017-02-014417-014-0935ND
2017-02-014417-016-1110ND
2017-02-014417-018-1045ND
2017-02-014417-019-0715ND
2017-02-014417-020-0800ND
2017-02-014417-039-1000ND
2017-02-014417-061-0855ND
2017-02-014417-063-0750ND
2017-03-014417-011-1020ND
2017-04-264417-016-1120ND
2017-04-264417-039-0955ND
2017-07-194417-016-11101.000 ppb
2017-07-194417-018-1035ND
2017-07-194417-039-0945ND
2017-10-114417-016-1100ND
2017-10-114417-039-0720ND
2018-01-314417-009-0820ND
2018-01-314417-011-0905ND
2018-01-314417-012-0735ND
2018-01-314417-013-1140ND
2018-01-314417-014-0935ND
2018-01-314417-016-1050ND
2018-01-314417-018-1030ND
2018-01-314417-019-0840ND
2018-01-314417-020-1010ND
2018-01-314417-039-0755ND
2018-01-314417-061-0705ND
2018-01-314417-063-0950ND
2018-02-214417-006-0950ND
2018-02-214417-006-1000ND
2018-04-254417-016-1110ND
2018-04-254417-039-0730ND
2018-07-184417-016-1105ND
2018-07-184417-039-0715ND
2018-10-104417-016-1110ND
2018-10-104417-039-0720ND
2019-01-304417-009-0805ND
2019-01-304417-011-0835ND
2019-01-304417-012-0740ND
2019-01-304417-013-1135ND
2019-01-304417-014-0910ND
2019-01-304417-016-1015ND
2019-01-304417-018-1110ND
2019-01-304417-019-0945ND
2019-01-304417-020-0920ND
2019-01-304417-039-0715ND
2019-01-304417-061-0700ND
2019-04-244417-016-1055ND
2019-04-244417-039-0725ND
2019-07-174417-016-1110ND
2019-07-174417-039-0715ND
2019-11-064417-016-1125ND
2019-11-064417-039-0755ND
2019-11-064417-063-1020ND