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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Missouri American St. Louis County & St. Charles County

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.0230 ppb204ND - 0.150 ppb
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A

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
2013-02-05210183010.150 ppb
2013-02-05210199010.0800 ppb
2013-02-0521020101ND
2013-02-0621016401ND
2013-02-0621017401ND
2013-05-0921801201ND
2013-05-0921801001ND
2013-05-0921799401ND
2013-05-0921798501ND
2013-05-09217975010.0900 ppb
2013-08-0823174601ND
2013-08-0823174401ND
2013-08-0823172801ND
2013-08-0823171901ND
2013-08-0823170901ND
2013-11-05239316010.140 ppb
2013-11-0523933501ND
2013-11-0623932601ND
2013-11-0623935101ND
2013-11-0623935301ND