1,4-Dioxane
Guymon
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 0.104 ppb | 12 | 5 | ND - 0.550 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 |
|---|---|---|
| 2015-01-12 | 201501150485AM | 0.1000 ppb |
| 2015-01-12 | 201501150507AM | ND |
| 2015-01-12 | 201501150491AM | ND |
| 2015-01-12 | 201501150511AM | ND |
| 2015-01-12 | 201501150583AM | ND |
| 2015-04-21 | 201504220380AM | 0.370 ppb |
| 2015-07-13 | 201506170699AM | 0.130 ppb |
| 2015-07-13 | 201506170697AM | ND |
| 2015-07-14 | 201506170701AM | ND |
| 2015-07-14 | 201506170705AM | 0.0990 ppb |
| 2015-07-14 | 201506170703AM | ND |
| 2015-10-13 | 201510050028AM | 0.550 ppb |