Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

1,4-Dioxane

Los Angeles County WW District 4 & 34-Lancaster

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND160ND
2014ND180ND
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
2012-01-245442-002-0842ND
2012-01-245442-053-0903ND
2012-01-245442-054-0937ND
2012-11-085442-048-1010ND
2012-11-145442-054-1157ND
2013-11-14201311150378AMND
2013-11-18201311200611AMND
2013-11-18201311210815AMND
2013-11-18201311210801AMND
2013-11-18201311200623AMND
2013-11-19201311250078AMND
2013-11-19201311220608AMND
2013-11-19201311220610AMND
2013-11-19201311250062AMND
2013-11-20201311270082AMND
2013-11-20201311270080AMND
2013-11-20201312020193AMND
2013-11-20201312020184AMND
2013-11-25201312030252AMND
2013-11-25201312040648AMND
2013-11-25201312030254AMND
2014-02-13201402140365AMND
2014-05-13201405160381AMND
2014-05-13201405160379AMND
2014-05-13201405160338AMND
2014-05-14201405190271AMND
2014-05-14201405160334AMND
2014-05-14201405220244AMND
2014-05-14201405160332AMND
2014-05-14201405160336AMND
2014-05-14201405190269AMND
2014-05-20201405220248AMND
2014-05-20201405230366AMND
2014-05-21201405290634AMND
2014-05-21201405230368AMND
2014-05-21201405230356AMND
2014-05-27201405290654AMND
2014-05-27201405290650AMND
2014-08-07201408120547AMND