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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Edina

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.0550 ppb41ND - 0.220 ppb
20140.111 ppb32ND - 0.260 ppb
2015ND10ND
2016N/A00N/A
20170.372 ppb1311ND - 0.860 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
2013-07-251039552003ND
2013-07-251039552006ND
2013-07-2510395520090.220 ppb
2013-09-251310539-01ND
2014-01-2910695510090.260 ppb
2014-01-2910695510060.0740 ppb
2014-01-291069551003ND
2015-06-242079084001ND
2017-02-0717B0344-040.600 ppb
2017-02-0717B0344-030.510 ppb
2017-02-0717B0344-02ND
2017-02-0717B0344-010.230 ppb
2017-04-1317D0836-010.510 ppb
2017-04-1317D0836-02ND
2017-04-1317D0836-030.860 ppb
2017-05-1517E1214-010.120 ppb
2017-07-2617G1826-010.0980 ppb
2017-07-2617G1826-030.430 ppb
2017-07-2617G1826-040.520 ppb
2017-12-1917L0684-010.500 ppb
2017-12-1917L0684-020.460 ppb