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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

California Water Service Company - Hermosa / Redondo Beach

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND20ND
2015ND120ND
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
2012-09-129590-001-0857ND
2012-09-129590-005-0950ND
2013-09-119590-001-1355ND
2013-09-119590-005-1422ND
2014-09-039590-001-1435ND
2014-09-039590-005-1351ND
2015-02-11201502120092AMND
2015-02-11201502120147AMND
2015-02-11201502120108AMND
2015-02-11201502110686AMND
2015-05-06201505070030AMND
2015-05-06201505070046AMND
2015-08-06201508060792AMND
2015-08-06201508060774AMND
2015-08-20201508200649AMND
2015-08-20201508200603AMND
2015-11-04201511040804AMND
2015-11-04201511040749AMND