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EWG's Tap Water Database — 2021 UPDATE

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1,4-Dioxane

Bellflower - Somerset MWC

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

 

157

Samples

0

Samples exceeding legal limit (MCL)

156

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.98 ppb29291.40 ppb - 18.0 ppb
20153.50 ppb2625ND - 7.70 ppb
20163.33 ppb24241.70 ppb - 7.30 ppb
20173.08 ppb23231.60 ppb - 6.90 ppb
20183.18 ppb28281.60 ppb - 6.90 ppb
20193.12 ppb27271.50 ppb - 7.70 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
2014-01-159588-008-09283.80 ppb
2014-01-159588-021-094514.0 ppb
2014-01-159588-022-09183.80 ppb
2014-01-159588-026-09524.70 ppb
2014-01-159588-027-093615.0 ppb
2014-01-159588-029-091018.0 ppb
2014-04-149588-008-10322.20 ppb
2014-04-149588-009-11171.60 ppb
2014-04-149588-021-10006.60 ppb
2014-04-149588-022-10461.80 ppb
2014-04-149588-026-11001.40 ppb
2014-04-149588-027-10173.40 ppb
2014-04-149588-029-09485.50 ppb
2014-07-239588-008-12402.60 ppb
2014-07-239588-009-14401.90 ppb
2014-07-239588-011-14005.60 ppb
2014-07-239588-021-13347.10 ppb
2014-07-239588-022-11442.00 ppb
2014-07-239588-026-15071.70 ppb
2014-07-239588-029-11006.10 ppb
2014-08-019588-027-09203.60 ppb
2014-10-229588-008-09592.70 ppb
2014-10-229588-009-11131.80 ppb
2014-10-229588-011-10585.80 ppb
2014-10-229588-021-10347.30 ppb
2014-10-229588-022-10123.10 ppb
2014-10-229588-026-11281.80 ppb
2014-10-229588-027-10443.40 ppb
2014-10-229588-029-09416.20 ppb
2015-01-309588-008-12152.70 ppb
2015-01-309588-009-11202.10 ppb
2015-01-309588-011-11475.70 ppb
2015-01-309588-021-13196.60 ppb
2015-01-309588-022-10372.20 ppb
2015-01-309588-026-10101.90 ppb
2015-01-309588-027-1237ND
2015-04-159588-008-10102.60 ppb
2015-04-159588-009-10392.10 ppb
2015-04-159588-021-11086.90 ppb
2015-04-159588-022-09362.30 ppb
2015-04-159588-026-10262.30 ppb
2015-04-159588-027-09584.00 ppb
2015-07-089588-008-10303.00 ppb
2015-07-089588-009-11232.40 ppb
2015-07-089588-021-11007.70 ppb
2015-07-089588-022-10152.20 ppb
2015-07-089588-026-11392.00 ppb
2015-07-089588-027-10464.50 ppb
2015-07-109588-029-10145.80 ppb
2015-10-279588-008-09582.60 ppb
2015-10-279588-009-09362.10 ppb
2015-10-279588-021-10207.20 ppb
2015-10-279588-022-10102.00 ppb
2015-10-279588-026-09181.90 ppb
2015-10-279588-029-09106.30 ppb
2016-01-139588-008-09582.30 ppb
2016-01-139588-009-11102.00 ppb
2016-01-139588-021-10205.90 ppb
2016-01-139588-022-09321.70 ppb
2016-01-139588-026-11341.90 ppb
2016-01-139588-029-09185.40 ppb
2016-06-179588-008-09552.50 ppb
2016-06-179588-009-11002.30 ppb
2016-06-179588-021-10357.00 ppb
2016-06-179588-022-09352.00 ppb
2016-06-179588-026-11221.90 ppb
2016-06-179588-029-09155.60 ppb
2016-07-149588-008-10252.30 ppb
2016-07-149588-009-11202.00 ppb
2016-07-149588-021-11007.30 ppb
2016-07-149588-022-10051.90 ppb
2016-07-149588-026-11351.90 ppb
2016-07-149588-029-09405.40 ppb
2016-10-109588-022-09481.80 ppb
2016-10-109588-026-11041.80 ppb
2016-10-109588-029-09305.20 ppb
2016-11-169588-008-09251.80 ppb
2016-11-169588-009-10002.10 ppb
2016-11-169588-021-09406.00 ppb
2017-01-259588-008-09451.70 ppb
2017-01-259588-009-10301.80 ppb
2017-01-259588-022-09201.60 ppb
2017-01-259588-026-11052.20 ppb
2017-01-259588-029-09304.80 ppb
2017-05-099588-008-12051.90 ppb
2017-05-099588-009-11452.00 ppb
2017-05-099588-021-11056.40 ppb
2017-05-099588-022-10151.70 ppb
2017-05-099588-026-11201.70 ppb
2017-05-099588-029-10004.30 ppb
2017-07-119588-009-09582.30 ppb
2017-07-119588-021-10506.90 ppb
2017-07-119588-022-10221.80 ppb
2017-07-119588-026-09451.80 ppb
2017-07-119588-029-09305.10 ppb
2017-10-199588-008-10202.10 ppb
2017-10-199588-009-09402.40 ppb
2017-10-199588-021-10596.50 ppb
2017-10-199588-022-10321.70 ppb
2017-10-199588-026-09241.90 ppb
2017-10-199588-027-10053.40 ppb
2017-10-199588-029-09054.90 ppb
2018-01-099588-008-10422.20 ppb
2018-01-099588-009-10092.40 ppb
2018-01-099588-021-11106.90 ppb
2018-01-099588-022-09542.00 ppb
2018-01-099588-026-09402.00 ppb
2018-01-099588-027-10303.20 ppb
2018-01-099588-029-09255.10 ppb
2018-04-169588-008-09572.20 ppb
2018-04-169588-009-11003.20 ppb
2018-04-169588-021-09326.90 ppb
2018-04-169588-022-10121.60 ppb
2018-04-169588-026-10442.60 ppb
2018-04-169588-027-10272.90 ppb
2018-04-169588-029-09084.90 ppb
2018-07-269588-008-11052.00 ppb
2018-07-269588-009-09352.00 ppb
2018-07-269588-021-10356.40 ppb
2018-07-269588-022-10101.60 ppb
2018-07-269588-026-09551.90 ppb
2018-07-269588-027-11202.10 ppb
2018-07-269588-029-09134.60 ppb
2018-10-299588-008-10002.00 ppb
2018-10-299588-009-10452.10 ppb
2018-10-299588-021-09306.30 ppb
2018-10-299588-022-09451.60 ppb
2018-10-299588-029-09154.50 ppb
2018-11-139588-026-09241.80 ppb
2018-11-139588-027-09502.10 ppb
2019-01-169588-008-10352.60 ppb
2019-01-169588-009-10082.80 ppb
2019-01-169588-021-11307.70 ppb
2019-01-169588-022-10482.20 ppb
2019-01-169588-027-11002.90 ppb
2019-01-169588-029-09486.00 ppb
2019-05-089588-009-10052.10 ppb
2019-05-089588-021-10405.90 ppb
2019-05-089588-022-09351.60 ppb
2019-05-089588-026-10251.90 ppb
2019-05-089588-027-09501.90 ppb
2019-05-089588-029-11154.50 ppb
2019-05-209588-008-09451.80 ppb
2019-07-319588-008-09451.90 ppb
2019-07-319588-009-11002.00 ppb
2019-07-319588-021-10155.80 ppb
2019-07-319588-022-09331.50 ppb
2019-07-319588-026-10451.90 ppb
2019-07-319588-027-10002.50 ppb
2019-07-319588-029-10254.40 ppb
2019-10-179588-008-11202.00 ppb
2019-10-179588-009-10082.20 ppb
2019-10-179588-021-12005.90 ppb
2019-10-179588-022-10581.60 ppb
2019-10-179588-027-10452.30 ppb
2019-10-179588-029-12404.40 ppb
2019-11-149588-026-09352.00 ppb