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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

Bethpage WD

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.

MORE ABOUT THIS CONTAMINANT

 

66

Samples

0

Samples exceeding legal limit (MCL)

56

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20132.93 ppb10100.310 ppb - 8.50 ppb
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
20184.42 ppb33330.280 ppb - 12.1 ppb
20194.64 ppb2319ND - 11.9 ppb

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
2013-01-0490005 0120130.330 ppb
2013-01-0490007 0120130.920 ppb
2013-01-0490002 0120134.30 ppb
2013-01-0490003 0120138.20 ppb
2013-01-0490001 0120130.870 ppb
2013-07-2290003 PLANT68.50 ppb
2013-07-2290001 PLANT51.30 ppb
2013-07-2290005 PLANT-10.310 ppb
2013-07-2290002 PLANT43.60 ppb
2013-07-2290007 WELL BGD-11.000 ppb
2018-01-1870407260070.670 ppb
2018-01-1870407260038.50 ppb
2018-01-1870407260080.400 ppb
2018-01-1870407260029.60 ppb
2018-01-1870407260090.410 ppb
2018-01-1870407260068.00 ppb
2018-01-1870407260011.70 ppb
2018-01-18704072600510.9 ppb
2018-01-1870407260042.00 ppb
2018-04-0270468450029.80 ppb
2018-04-0270468450040.430 ppb
2018-04-0270468450030.740 ppb
2018-04-0270468450050.540 ppb
2018-04-02704684500111.0 ppb
2018-04-0370469690011.70 ppb
2018-04-0370469690022.20 ppb
2018-04-03704696900312.1 ppb
2018-04-0370469690049.60 ppb
2018-07-0570571340042.10 ppb
2018-07-0570571340011.40 ppb
2018-07-0570571340080.480 ppb
2018-07-0570571340060.280 ppb
2018-07-0570571340029.00 ppb
2018-07-0570571340070.380 ppb
2018-07-0570571340059.10 ppb
2018-10-0370667150039.90 ppb
2018-10-0370667150070.420 ppb
2018-10-0370667150080.600 ppb
2018-10-0370667150028.90 ppb
2018-10-0370667150058.40 ppb
2018-10-0370667150042.30 ppb
2018-10-0370667150011.50 ppb
2018-10-0370667150060.660 ppb
2019-01-2970777610019.30 ppb
2019-01-30707792500311.9 ppb
2019-01-3070779250029.80 ppb
2019-01-3070779250050.880 ppb
2019-01-3070779250042.80 ppb
2019-01-3070779250012.10 ppb
2019-01-3070779250070.770 ppb
2019-01-3070779250060.530 ppb
2019-05-0370176290026.70 ppb
2019-06-1170931180028.40 ppb
2019-06-117093118001ND
2019-07-1770977980018.60 ppb
2019-07-1770977980030.0530 ppb
2019-07-2470987560017.60 ppb
2019-07-2470987560030.0680 ppb
2019-07-3070993140030.0830 ppb
2019-07-3070993140018.50 ppb
2019-10-0370107205004ND
2019-10-03701072050029.90 ppb
2019-11-0170110397003ND
2019-11-01701103970019.50 ppb
2019-12-0370113799003ND
2019-12-03701137990019.20 ppb