1,4-Dioxane
Westbury 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.403 ppb | 10 | 7 | ND - 1.10 ppb |
| 2014 | 0.324 ppb | 10 | 7 | ND - 0.830 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 0.609 ppb | 11 | 10 | ND - 1.50 ppb |
| 2019 | N/A | 0 | 0 | N/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 |
|---|---|---|
| 2013-07-22 | 07353 | 0.580 ppb |
| 2013-07-22 | 13192 | 0.0940 ppb |
| 2013-07-22 | 08007 | ND |
| 2013-07-22 | 05007 | 0.360 ppb |
| 2013-07-23 | 05654 | 0.360 ppb |
| 2013-07-23 | 02602 | ND |
| 2013-07-23 | 08497 | 0.440 ppb |
| 2013-10-01 | 07785 | 1.10 ppb |
| 2013-10-01 | 10451 | ND |
| 2013-10-01 | 00101 | 1.10 ppb |
| 2014-01-30 | UCMR3 10451 | ND |
| 2014-01-30 | UCMR3 13192 | 0.0860 ppb |
| 2014-01-30 | UCMR3 08497 | 0.310 ppb |
| 2014-01-30 | UCMR3 05007 | 0.360 ppb |
| 2014-01-30 | UCMR3 02602 | ND |
| 2014-01-30 | UCMR3 07353 | 0.540 ppb |
| 2014-01-30 | UCMR3 07785 | 0.800 ppb |
| 2014-01-30 | UCMR3 05654 | 0.310 ppb |
| 2014-03-30 | UCMR3 00101 | 0.830 ppb |
| 2014-08-21 | 08007 082014 | ND |
| 2018-10-18 | 7068333009 | 0.0840 ppb |
| 2018-10-18 | 7068333003 | 0.600 ppb |
| 2018-10-18 | 7068333004 | 0.680 ppb |
| 2018-10-18 | 7068333001 | 1.10 ppb |
| 2018-10-18 | 7068333002 | 1.50 ppb |
| 2018-10-18 | 7068333008 | 0.0230 ppb |
| 2018-10-18 | 7068333006 | 0.0850 ppb |
| 2018-10-18 | 7068333007 | 0.860 ppb |
| 2018-10-18 | 7068333005 | 1.40 ppb |
| 2018-10-19 | 7068475002 | 0.370 ppb |
| 2018-10-19 | 7068475001 | ND |