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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

North Penn Water Authority

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.

 

30

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
20150.0350 ppb308ND - 0.270 ppb
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
2015-01-133170079ND
2015-01-133170178ND
2015-01-133170223ND
2015-01-133170232ND
2015-01-133170205ND
2015-01-133170014ND
2015-01-1331702140.0800 ppb
2015-01-133170060ND
2015-01-133170035ND
2015-01-133170130ND
2015-01-1331701520.0800 ppb
2015-01-133169994ND
2015-01-133170192ND
2015-01-1331700960.230 ppb
2015-04-083220949ND
2015-07-143282182ND
2015-07-143282191ND
2015-07-143282124ND
2015-07-1432821550.130 ppb
2015-07-143282209ND
2015-07-1432822180.0700 ppb
2015-07-1432821420.0800 ppb
2015-07-143282133ND
2015-07-1432822410.110 ppb
2015-07-143282234ND
2015-07-1432822270.270 ppb
2015-07-143282200ND
2015-07-143282164ND
2015-07-143282173ND
2015-10-073336884ND