1,4-Dioxane
Dtma 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.
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 | 0.191 ppb | 30 | 15 | ND - 2.11 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 |
|---|---|---|
| 2014-02-18 | 104902P | ND |
| 2014-02-18 | 104905P | 2.11 ppb |
| 2014-02-18 | 104908P | 0.136 ppb |
| 2014-02-18 | 104900P | 0.0972 ppb |
| 2014-02-18 | 104907P | ND |
| 2014-02-18 | 104906P | ND |
| 2014-02-19 | 104912P | ND |
| 2014-02-19 | 104899P | ND |
| 2014-02-19 | 104903P | 0.179 ppb |
| 2014-02-19 | 104904P | ND |
| 2014-02-19 | 104910P | 0.106 ppb |
| 2014-02-19 | 104909P | 0.0948 ppb |
| 2014-02-19 | 104911P | 0.0913 ppb |
| 2014-02-19 | 104901P | 0.0892 ppb |
| 2014-05-21 | 106963P | ND |
| 2014-08-18 | 108938P | 0.0900 ppb |
| 2014-08-18 | 108932P | ND |
| 2014-08-18 | 108937P | 0.130 ppb |
| 2014-08-18 | 108930P | 0.200 ppb |
| 2014-08-18 | 108935P | 0.240 ppb |
| 2014-08-19 | 108927P | 0.0800 ppb |
| 2014-08-19 | 108936P | ND |
| 2014-08-19 | 108934P | ND |
| 2014-08-19 | 108920P | 0.1000 ppb |
| 2014-08-19 | 108929P | ND |
| 2014-08-19 | 108928P | ND |
| 2014-08-19 | 108926P | ND |
| 2014-08-20 | 108931P | ND |
| 2014-08-20 | 108933P | 2.00 ppb |
| 2014-11-24 | 109694P | ND |