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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

City of Caldwell

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.

 

26

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
2014ND130ND
2015ND130ND
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
2014-11-24141201001-010ND
2014-11-24141201001-012ND
2014-11-24141201001-009ND
2014-11-24141201001-011ND
2014-11-24141201001-007ND
2014-11-24141201001-008ND
2014-11-24141201004-008ND
2014-11-24141201004-007ND
2014-11-24141201004-010ND
2014-11-25141201004-009ND
2014-11-25141201004-011ND
2014-11-25141201004-006ND
2014-12-01141202018-003ND
2015-05-26150528035-001ND
2015-05-26150528035-003ND
2015-05-26150528035-005ND
2015-05-26150528035-008ND
2015-05-26150528035-002ND
2015-05-27150528035-007ND
2015-05-27150528035-006ND
2015-05-27150528035-009ND
2015-05-27150528035-010ND
2015-05-27150528035-004ND
2015-05-28150529019-003ND
2015-05-28150529019-002ND
2015-05-28150529019-001ND