1,4-Dioxane
Hynes Estates Mutual Water Company
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 | ND | 2 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
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 |
|---|---|---|
| 2014-01-15 | 4417-001-1235 | ND |
| 2014-01-15 | 4417-002-1300 | ND |
| 2015-01-15 | 4417-002-0940 | ND |
| 2015-03-18 | 4417-001-1120 | ND |
| 2015-04-20 | 4417-001-1120 | ND |
| 2016-01-13 | 4417-002-1040 | ND |
| 2016-04-04 | 4417-001-1025 | ND |
| 2017-01-04 | 4417-001-1030 | ND |
| 2017-03-13 | 4417-002-1000 | ND |
| 2017-07-25 | 4417-001-0905 | ND |
| 2018-01-04 | 4417-001-0900 | ND |
| 2019-01-08 | 4417-001-1130 | ND |
| 2019-07-10 | 4417-005-1130 | ND |
| 2019-11-07 | 4417-005-1310 | ND |