1,4-Dioxane
North Wales Water Authority
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 |
---|---|---|---|---|
2014 | 0.0395 ppb | 22 | 5 | ND - 0.240 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 |
---|---|---|
2014-02-04 | 14012246-02 | 0.150 ppb |
2014-02-04 | 14012246-01 | ND |
2014-02-04 | 14012246-03 | ND |
2014-02-04 | 14012246-06 | ND |
2014-02-04 | 14012246-07 | ND |
2014-02-04 | 14012246-04 | 0.190 ppb |
2014-02-04 | 14012246-09 | ND |
2014-02-04 | 14012246-08 | 0.0800 ppb |
2014-02-04 | 14012246-10 | ND |
2014-02-04 | 14012246-05 | ND |
2014-05-06 | 35138742016AM | ND |
2014-08-11 | 14080705-01 | ND |
2014-08-11 | 14080706-01 | ND |
2014-08-11 | 14080704-01 | ND |
2014-08-11 | 14080709-01 | ND |
2014-08-11 | 14080707-01 | ND |
2014-08-11 | 14080708-01 | ND |
2014-08-11 | 14080700-01 | ND |
2014-08-11 | 14080703-01 | 0.240 ppb |
2014-08-11 | 14080702-01 | ND |
2014-08-11 | 14080701-01 | 0.210 ppb |
2014-11-10 | 14103223-02 | ND |