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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Golden State Water Company (GSWC) - San Dimas

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.

 

16

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
2013N/A00N/A
2014N/A00N/A
2015ND160ND
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
2015-01-215A21031-11AND
2015-01-215A21031-09AND
2015-01-215A21031-03AND
2015-01-215A21031-05AND
2015-01-215A21031-01AND
2015-01-215A21031-07AND
2015-04-175D17033-03AND
2015-04-175D17033-01AND
2015-07-215G21057-11AND
2015-07-215G21057-09AND
2015-07-215G21057-05AND
2015-07-215G21057-01AND
2015-07-215G21057-03AND
2015-07-215G21057-07AND
2015-10-205J21034-01AND
2015-10-205J21034-03AND