Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

1,4-Dioxane

City of Tucson

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.

MORE ABOUT THIS CONTAMINANT

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.00458 ppb481ND - 0.220 ppb
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/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
2013-04-15201304160052AMND
2013-04-15201304160050AMND
2013-04-15201304160054AMND
2013-04-15201304160056AMND
2013-04-16201304180590AM0.220 ppb
2013-04-16201304180588AMND
2013-04-16201304180586AMND
2013-04-17201304190462AMND
2013-04-17201304190460AMND
2013-04-17201304190458AMND
2013-04-22201304240203AMND
2013-04-22201304240201AMND
2013-04-22201304240197AMND
2013-04-22201304240199AMND
2013-04-23201304250523AMND
2013-04-23201304250525AMND
2013-04-23201304250529AMND
2013-04-23201304250527AMND
2013-04-24201304260164AMND
2013-04-24201304260162AMND
2013-04-24201304260166AMND
2013-04-29201305010449AMND
2013-04-29201305020190AMND
2013-04-29201305010451AMND
2013-10-08201310110331AMND
2013-10-08201310120150AMND
2013-10-08201310110333AMND
2013-10-08201310110337AMND
2013-10-08201310110335AMND
2013-10-08201310120152AMND
2013-10-09201310120160AMND
2013-10-09201310120156AMND
2013-10-09201310120154AMND
2013-10-09201310120158AMND
2013-10-09201310120162AMND
2013-10-14201310150058AMND
2013-10-14201310150054AMND
2013-10-14201310150052AMND
2013-10-14201310150056AMND
2013-10-16201310170122AMND
2013-10-16201310170124AMND
2013-10-16201310170118AMND
2013-10-16201310170126AMND
2013-10-16201310170120AMND
2013-10-17201310180357AMND
2013-10-17201310180359AMND
2013-10-17201310180355AMND
2013-10-29201310300082AMND