1,4-Dioxane
Robeson County 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | ND | 13 | 0 | ND |
| 2014 | ND | 13 | 0 | ND |
| 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 |
|---|---|---|
| 2013-12-03 | 761613-10408 | ND |
| 2013-12-03 | 761607-10408 | ND |
| 2013-12-03 | 761590-10408 | ND |
| 2013-12-03 | 761588-10408 | ND |
| 2013-12-03 | 761611-10408 | ND |
| 2013-12-03 | 761594-10408 | ND |
| 2013-12-03 | 761609-10408 | ND |
| 2013-12-09 | 762384-10458 | ND |
| 2013-12-09 | 762370-10433 | ND |
| 2013-12-09 | 762368-10433 | ND |
| 2013-12-09 | 762374-10433 | ND |
| 2013-12-09 | 762372-10433 | ND |
| 2013-12-09 | 762386-10458 | ND |
| 2014-05-19 | 790782-11496 | ND |
| 2014-05-19 | 792048-11496 | ND |
| 2014-05-19 | 790778-11496 | ND |
| 2014-05-19 | 790776-11496 | ND |
| 2014-05-19 | 790780-11496 | ND |
| 2014-05-20 | 792050-11539 | ND |
| 2014-05-20 | 790799-11539 | ND |
| 2014-05-20 | 790797-11539 | ND |
| 2014-05-20 | 792078-11539 | ND |
| 2014-05-20 | 790772-11539 | ND |
| 2014-05-20 | 792084-11539 | ND |
| 2014-05-20 | 792080-11539 | ND |
| 2014-05-20 | 792086-11539 | ND |