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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

Hicksville 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

 

140

Samples

0

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20133.10 ppb1513ND - 33.0 ppb
20140.590 ppb220.560 ppb - 0.620 ppb
2015N/A00N/A
201619.1 ppb3313.1 ppb - 30.0 ppb
20175.00 ppb115.00 ppb
20187.95 ppb664.10 ppb - 15.5 ppb
20192.26 ppb113108ND - 13.9 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
2013-06-17075625.60 ppb
2013-06-1809463ND
2013-06-18075611.10 ppb
2013-06-19087780.500 ppb
2013-06-24105550.300 ppb
2013-06-25061900.920 ppb
2013-07-01815740.450 ppb
2013-08-0806192 - HICKSVIL1.000 ppb
2013-12-1709463 (T09463)ND
2013-12-1781574 (T81574)0.290 ppb
2013-12-1808778 (T8778)0.730 ppb
2013-12-1807561 (T07561)0.760 ppb
2013-12-1808526 (T08526)33.0 ppb
2013-12-1906192 (T06192)0.950 ppb
2013-12-1906190 (T06190)0.920 ppb
2014-11-1910555 1120140.620 ppb
2014-11-1907562 1120140.560 ppb
2016-03-141603A96-00130.0 ppb
2016-12-1970721400114.3 ppb
2016-12-1970721400213.1 ppb
2017-12-117037780002-POCS5.00 ppb
2018-03-20704579400115.5 ppb
2018-03-20704579400213.5 ppb
2018-06-267056269002-POCS5.30 ppb
2018-06-267056269001-POCS4.20 ppb
2018-09-127064540006-POCS4.10 ppb
2018-09-127064540005-POCS5.10 ppb
2019-01-1170764070013.10 ppb
2019-01-1170764070021.80 ppb
2019-01-2270772870018.50 ppb
2019-04-1070853690012.60 ppb
2019-04-1070853660011.10 ppb
2019-04-1070853660021.000 ppb
2019-04-1070853690021.20 ppb
2019-04-1170855470010.0880 ppb
2019-04-1170855470040.440 ppb
2019-04-1570858250010.930 ppb
2019-04-1570858250061.20 ppb
2019-04-1570858250020.820 ppb
2019-04-1770862140011.20 ppb
2019-04-17708621400413.2 ppb
2019-04-22708678100110.6 ppb
2019-05-1370892340012.80 ppb
2019-05-1370892340021.60 ppb
2019-05-2070901420021.000 ppb
2019-05-20709014200113.3 ppb
2019-05-2270903970010.0910 ppb
2019-05-2270903970020.500 ppb
2019-05-2370906890021.000 ppb
2019-05-2370906890030.790 ppb
2019-05-2370906890010.800 ppb
2019-05-2870910630030.0890 ppb
2019-05-28709106300110.8 ppb
2019-06-1070929280020.320 ppb
2019-06-1070929280010.0300 ppb
2019-06-1270933120040.0870 ppb
2019-06-1270933120010.0860 ppb
2019-06-18709412200110.7 ppb
2019-06-2070945170011.60 ppb
2019-06-2070945170023.00 ppb
2019-06-247094943001-POCS0.0850 ppb
2019-06-25709511300111.9 ppb
2019-06-2570951130021.20 ppb
2019-07-1070968550020.160 ppb
2019-07-1070968550019.80 ppb
2019-07-117097186001-POCS2.90 ppb
2019-07-117097186004-POCS1.30 ppb
2019-07-1570974670010.0970 ppb
2019-07-157097467002-POCS0.540 ppb
2019-07-2270983570020.730 ppb
2019-07-2270983570011.10 ppb
2019-07-227098356002-POCS0.0880 ppb
2019-07-2270983570030.790 ppb
2019-07-2370985550031.10 ppb
2019-07-267099063002ND
2019-07-2670990630010.0900 ppb
2019-07-3070992990019.30 ppb
2019-07-3170994930021.000 ppb
2019-08-13701010820011.30 ppb
2019-08-14701012810013.10 ppb
2019-08-14701011940010.140 ppb
2019-08-1470101281002ND
2019-08-14701011940020.510 ppb
2019-08-19701018880060.870 ppb
2019-08-19701018880010.990 ppb
2019-08-19701018880020.800 ppb
2019-08-20701020440010.130 ppb
2019-08-227010245000111.2 ppb
2019-08-22701024500031.30 ppb
2019-08-26701027010010.230 ppb
2019-08-26701027030011.30 ppb
2019-08-2670102703002ND
2019-09-05701038800020.940 ppb
2019-09-057010388000113.7 ppb
2019-09-1070104328001 POC1.60 ppb
2019-09-1070104328002 POC1.40 ppb
2019-09-1670105031002 POC0.630 ppb
2019-09-1670105031001 POC0.160 ppb
2019-09-1870105415001 POC0.190 ppb
2019-09-1970105641002 POC2.80 ppb
2019-09-1970105641001 POC0.660 ppb
2019-09-1970105603002 POC0.120 ppb
2019-09-1970105638001 POC9.60 ppb
2019-09-2470106094001 PRI1.10 ppb
2019-10-09701078610080.110 ppb
2019-10-09701078610010.970 ppb
2019-10-09701078610030.980 ppb
2019-10-09701078610090.560 ppb
2019-10-09701078610021.000 ppb
2019-10-16701086180011.10 ppb
2019-10-167010861800213.9 ppb
2019-10-17701088190011.50 ppb
2019-10-17701088190021.30 ppb
2019-10-21701091250049.30 ppb
2019-10-21701091250013.00 ppb
2019-10-21701091250020.620 ppb
2019-10-22701092760010.260 ppb
2019-10-24701096210010.110 ppb
2019-10-29701099850011.000 ppb
2019-11-06701108280030.270 ppb
2019-11-06701108280010.130 ppb
2019-11-07701110770010.0970 ppb
2019-11-07701110770020.730 ppb
2019-11-12701115370021.10 ppb
2019-11-1411/14/20191.10 ppb
2019-11-14701119600021.000 ppb
2019-11-14701119600031.10 ppb
2019-11-18701122130022.20 ppb
2019-11-18701122130010.420 ppb
2019-11-20701125260021.40 ppb
2019-11-20701125260011.70 ppb
2019-12-0470114019001ND
2019-12-04701140170018.30 ppb
2019-12-09701145600021.10 ppb
2019-12-09701145600011.000 ppb
2019-12-09701145600031.10 ppb
2019-12-11701149920021.40 ppb
2019-12-11701149920011.70 ppb
2019-12-1270115194004ND
2019-12-12701151940010.670 ppb