1,4-Dioxane
City of Beloit
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 | 0.0882 ppb | 12 | 3 | ND - 0.676 ppb |
2014 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2013-03-11 | 709338-8500 | ND |
2013-03-11 | 709312-8500 | ND |
2013-03-11 | 709310-8500 | 0.676 ppb |
2013-03-11 | 709330-8500 | ND |
2013-03-11 | 709336-8500 | 0.208 ppb |
2013-03-11 | 709326-8500 | ND |
2013-09-16 | 745335-9937 | ND |
2013-09-16 | 745327-9937 | ND |
2013-09-16 | 745329-9937 | 0.175 ppb |
2013-09-16 | 745331-9937 | ND |
2013-09-16 | 745333-9937 | ND |
2013-11-04 | 756576-10227 | ND |