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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

City of Houston

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.

 

103

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
20130.00337 ppb522ND - 0.0910 ppb
20140.00867 ppb516ND - 0.0790 ppb
2015N/A00N/A
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
2013-07-0913070911-05ND
2013-07-0913070906-02ND
2013-07-0913070906-05ND
2013-07-0913070910-03ND
2013-07-0913070911-04ND
2013-07-0913070910-04ND
2013-07-0913070906-04ND
2013-07-0913070906-03ND
2013-07-0913070906-010.0910 ppb
2013-07-0913070910-05ND
2013-07-1013071008-03ND
2013-07-1013070911-01ND
2013-07-1013070911-02ND
2013-07-1013071007-02ND
2013-07-1013070911-03ND
2013-07-1013070910-01ND
2013-07-1013071008-02ND
2013-07-1013070910-02ND
2013-07-1013071008-01ND
2013-07-1013071007-01ND
2013-07-1613071606-06ND
2013-07-1613071611-03ND
2013-07-1613071606-01ND
2013-07-1613071608-01ND
2013-07-1613071607-01ND
2013-07-1613071611-01ND
2013-07-1613071606-04ND
2013-07-1613071607-02ND
2013-07-1613071607-05ND
2013-07-1613071607-04ND
2013-07-1613071608-02ND
2013-07-1613071608-06ND
2013-07-1613071606-05ND
2013-07-1613071606-03ND
2013-07-1613071606-07ND
2013-07-1613071611-04ND
2013-07-1613071608-05ND
2013-07-1613071606-02ND
2013-07-1613071608-04ND
2013-07-3013073009-05ND
2013-07-3013073012-03ND
2013-07-3113073108-02ND
2013-10-1513101510-03ND
2013-10-1513101509-01ND
2013-10-1513101509-02ND
2013-10-1513101506-02ND
2013-10-1513101511-010.0840 ppb
2013-10-1513101510-01ND
2013-10-1513101506-01ND
2013-10-1613101607-02ND
2013-10-1613101607-03ND
2013-10-1613101606-01ND
2014-01-2114012115-05ND
2014-01-2114012111-03ND
2014-01-2114012115-010.0740 ppb
2014-01-2114012116-02ND
2014-01-2114012116-05ND
2014-01-2114012115-04ND
2014-01-2114012116-04ND
2014-01-2114012115-020.0700 ppb
2014-01-2114012116-03ND
2014-01-2114012110-02ND
2014-01-2114012115-03ND
2014-01-2114012116-01ND
2014-01-2114012112-01ND
2014-01-2114012111-02ND
2014-01-2114012111-01ND
2014-01-2114012110-01ND
2014-01-2214012112-03ND
2014-01-2214012112-04ND
2014-01-2214012112-02ND
2014-01-2214012112-05ND
2014-02-0514020507-06ND
2014-02-0514020508-03ND
2014-02-0514020508-02ND
2014-02-0514020507-01ND
2014-02-0514020511-01ND
2014-02-0514020509-01ND
2014-02-0514020508-01ND
2014-02-0514020507-04ND
2014-02-0514020509-02ND
2014-02-0514020509-05ND
2014-02-0514020509-04ND
2014-02-0514020511-02ND
2014-02-0514020511-06ND
2014-02-0514020507-05ND
2014-02-0514020507-03ND
2014-02-0514020509-03ND
2014-02-0514020507-07ND
2014-02-0514020508-04ND
2014-02-0514020508-05ND
2014-02-0514020511-05ND
2014-02-0514020511-04ND
2014-02-0514020511-03ND
2014-04-2114042111-02ND
2014-05-2714052711-030.0710 ppb
2014-05-2714052707-010.0710 ppb
2014-05-2714052707-020.0790 ppb
2014-05-2714052706-02ND
2014-05-2714052710-010.0770 ppb
2014-05-2714052712-01ND
2014-05-2714052711-01ND
2014-05-2714052706-01ND