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EWG's Tap Water Database — 2019 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.

 

133

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.321 ppb195ND - 1.30 ppb
20130.192 ppb4316ND - 1.33 ppb
20140.0667 ppb181ND - 1.20 ppb
2015ND180ND
2016ND170ND
20170.0556 ppb181ND - 1.000 ppb

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
2012-01-114417-009-0815ND
2012-01-114417-011-1035ND
2012-01-114417-012-0835ND
2012-01-114417-013-1410ND
2012-01-114417-014-0730ND
2012-01-114417-016-1115ND
2012-01-114417-018-1015ND
2012-01-114417-019-0800ND
2012-01-114417-020-0900ND
2012-01-114417-039-0955ND
2012-01-114417-061-0940ND
2012-04-044417-006-0935ND
2012-04-044417-016-11351.30 ppb
2012-05-024417-016-11251.30 ppb
2012-05-024417-016-11351.10 ppb
2012-07-254417-016-1110ND
2012-07-254417-039-1250ND
2012-10-174417-016-11301.20 ppb
2012-10-174417-039-09451.20 ppb
2013-01-094417-009-0840ND
2013-01-094417-011-1010ND
2013-01-094417-012-0905ND
2013-01-094417-013-1440ND
2013-01-094417-014-0800ND
2013-01-094417-016-1150ND
2013-01-094417-018-1035ND
2013-01-094417-019-0820ND
2013-01-094417-020-0740ND
2013-01-094417-039-1130ND
2013-01-094417-061-0945ND
2013-03-043010062821ND
2013-03-053010062816ND
2013-04-034417-006-1400ND
2013-04-034417-016-1145ND
2013-04-034417-039-0955ND
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
2013-07-244417-016-1140ND
2013-07-244417-039-0955ND
2013-09-033010062816-3ND
2013-09-033010062821-3ND
2013-10-164417-016-1050ND
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
2013-12-114417-039-1000ND
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
2014-04-024417-006-1400ND
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
2015-04-014417-006-1400ND
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
2016-04-274417-016-1115ND
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
2017-03-014417-011-1020ND
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