Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

1,4-Dioxane

City of Scottsdale

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20140.0593 ppb214ND - 0.550 ppb
20150.270 ppb110.270 ppb
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
2014-02-10201402100091AMND
2014-02-10201402100089AMND
2014-02-10201402100087AMND
2014-02-10201402100085AM0.540 ppb
2014-02-11201402120493AMND
2014-02-12201402120499AMND
2014-02-13201402130341AMND
2014-02-13201402130339AMND
2014-05-14201405140663AMND
2014-05-14201405140673AMND
2014-08-05201408050563AM0.550 ppb
2014-08-05201408050592AMND
2014-08-05201408050565AMND
2014-08-07201408070363AMND
2014-08-07201408070361AMND
2014-08-14201408140538AMND
2014-08-21201408220384AMND
2014-08-26201408260309AMND
2014-08-27201408270707AM0.0710 ppb
2014-11-10201411100071AM0.0850 ppb
2014-11-10201411100059AMND
2015-03-05201503050032AM0.270 ppb