1,4-Dioxane
Colbert County Rural Water 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 |
---|---|---|---|---|
2014 | 0.298 ppb | 14 | 8 | ND - 1.000 ppb |
2015 | 0.125 ppb | 6 | 3 | ND - 0.300 ppb |
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 |
---|---|---|
2014-06-30 | 2015851001 | 0.440 ppb |
2014-09-08 | 2028862002 | 0.670 ppb |
2014-09-08 | 2028862003 | ND |
2014-09-08 | 2028862015 | 0.440 ppb |
2014-09-16 | 2030134004 | ND |
2014-09-16 | 2030134003 | ND |
2014-09-16 | 2030134005 | 0.470 ppb |
2014-12-10 | 2044799024 | 0.450 ppb |
2014-12-10 | 2044799026 | ND |
2014-12-10 | 2044799014 | 0.310 ppb |
2014-12-10 | 2044799020 | 1.000 ppb |
2014-12-10 | 2044799022 | 0.390 ppb |
2014-12-10 | 2044799016 | ND |
2014-12-10 | 2044799018 | ND |
2015-03-23 | 2061790015 | ND |
2015-03-23 | 2061790019 | 0.260 ppb |
2015-03-23 | 2061790013 | 0.190 ppb |
2015-03-23 | 2061790023 | ND |
2015-03-23 | 2061790021 | 0.300 ppb |
2015-03-23 | 2061790017 | ND |