1,4-Dioxane
Swta - Main System
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | 0.0393 ppb | 9 | 4 | ND - 0.0990 ppb |
2014 | 0.0415 ppb | 13 | 6 | ND - 0.0990 ppb |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2013-12-10 | 1062890001 | ND |
2013-12-10 | 1062890016 | 0.0900 ppb |
2013-12-10 | 1062890007 | 0.0770 ppb |
2013-12-10 | 1062890019 | ND |
2013-12-10 | 1062890010 | ND |
2013-12-10 | 1062890004 | ND |
2013-12-10 | 1062890025 | 0.0990 ppb |
2013-12-10 | 1062890022 | ND |
2013-12-10 | 1062890013 | 0.0880 ppb |
2014-03-14 | 1076356003 | 0.0890 ppb |
2014-03-14 | 1076354003 | 0.0910 ppb |
2014-06-13 | 2012492028 | ND |
2014-06-13 | 2012492023 | ND |
2014-06-13 | 2012492043 | 0.0930 ppb |
2014-06-13 | 2012492033 | ND |
2014-06-13 | 2012492038 | 0.0990 ppb |
2014-06-13 | 2012492013 | ND |
2014-06-13 | 2012492003 | ND |
2014-06-13 | 2012492008 | ND |
2014-06-13 | 2012492018 | 0.0920 ppb |
2014-10-03 | 2032672007 | 0.0760 ppb |
2014-10-03 | 2032672003 | ND |