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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

City of Newport 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.

 

100

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.35 ppb168ND - 4.80 ppb
20131.08 ppb206ND - 5.80 ppb
20141.14 ppb186ND - 6.20 ppb
20150.764 ppb143ND - 3.80 ppb
20160.763 ppb164ND - 4.00 ppb
20170.631 ppb164ND - 2.70 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
2012-02-224417-002-08004.80 ppb
2012-02-234417-003-0820ND
2012-02-234417-004-08001.40 ppb
2012-03-274417-005-0850ND
2012-05-174417-002-08303.10 ppb
2012-05-174417-005-0915ND
2012-05-244417-003-0900ND
2012-05-244417-004-09301.30 ppb
2012-08-214417-003-10451.10 ppb
2012-08-224417-002-07304.20 ppb
2012-08-224417-004-07101.20 ppb
2012-08-224417-005-0650ND
2012-10-304417-003-0950ND
2012-10-304417-004-0915ND
2012-10-304417-005-0930ND
2012-12-104417-002-10254.50 ppb
2013-03-043010023803ND
2013-03-194417-003-0800ND
2013-03-194417-004-0740ND
2013-03-204417-005-0735ND
2013-03-214417-002-08004.50 ppb
2013-05-284417-003-1300ND
2013-05-284417-004-1230ND
2013-05-294417-005-1140ND
2013-05-304417-002-08153.10 ppb
2013-06-103010023803-2ND
2013-08-124417-002-10355.80 ppb
2013-08-124417-003-10501.000 ppb
2013-08-124417-004-10151.50 ppb
2013-08-124417-005-1000ND
2013-09-033010023803-3ND
2013-11-194417-004-0845ND
2013-11-194417-005-0905ND
2013-11-204417-003-0945ND
2013-11-264417-002-07555.60 ppb
2013-12-093010023803-4ND
2014-01-073010023802-10.830 ppb
2014-03-034417-004-0810ND
2014-03-034417-005-0830ND
2014-03-044417-002-10206.20 ppb
2014-03-044417-003-0810ND
2014-05-154417-003-0840ND
2014-05-154417-004-0820ND
2014-05-154417-005-0810ND
2014-06-103010023802-21.81 ppb
2014-06-184417-002-13004.40 ppb
2014-08-214417-002-08403.20 ppb
2014-08-214417-003-0855ND
2014-08-214417-004-0910ND
2014-08-214417-005-0925ND
2014-11-174417-003-0930ND
2014-11-174417-004-0910ND
2014-11-174417-005-0850ND
2014-12-104417-002-12554.00 ppb
2015-03-024417-004-0815ND
2015-03-024417-005-0835ND
2015-03-044417-002-09253.80 ppb
2015-03-044417-003-0940ND
2015-05-044417-002-10503.60 ppb
2015-05-044417-003-1115ND
2015-05-044417-004-1025ND
2015-05-044417-005-1010ND
2015-08-114417-002-09453.30 ppb
2015-08-114417-003-0920ND
2015-08-114417-004-0840ND
2015-08-114417-005-0825ND
2015-11-234417-004-0855ND
2015-11-234417-005-0840ND
2016-02-234417-002-07354.00 ppb
2016-02-294417-003-0835ND
2016-02-294417-004-1045ND
2016-02-294417-005-0805ND
2016-05-094417-002-08402.80 ppb
2016-05-094417-003-0850ND
2016-05-094417-004-0805ND
2016-06-164417-005-1050ND
2016-08-094417-002-09203.00 ppb
2016-08-094417-003-0905ND
2016-08-094417-004-0845ND
2016-08-094417-005-0830ND
2016-11-014417-002-09152.40 ppb
2016-11-014417-003-0930ND
2016-11-014417-004-0850ND
2016-11-014417-005-0835ND
2017-02-094417-002-10302.60 ppb
2017-02-094417-003-1015ND
2017-02-094417-004-0950ND
2017-02-094417-005-0930ND
2017-05-034417-002-12352.70 ppb
2017-05-034417-003-1220ND
2017-05-034417-004-1200ND
2017-05-034417-005-1145ND
2017-08-034417-002-08102.50 ppb
2017-08-034417-003-0825ND
2017-08-034417-004-0730ND
2017-08-034417-005-0745ND
2017-11-024417-002-10402.30 ppb
2017-11-024417-003-1015ND
2017-11-024417-004-0945ND
2017-11-024417-005-1000ND