1,4-Dioxane
Mayfield
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 |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2021-01-18 | JH2100417-A-PFOA | ND |
| 2021-01-18 | JH2100417-B-PFOA | ND |
| 2021-05-14 | JH2103553-PFOA | ND |
| 2021-05-14 | JH2103554-PFOA | ND |
| 2021-09-10 | JH2108190-PFOA | ND |
| 2021-09-10 | JH2108191-PFOA | ND |
| 2022-03-28 | JH2202332-DIOXANE | ND |
| 2022-03-28 | JH2202333-DIOXANE | ND |
| 2022-05-31 | JH2204107-DIOXANE | ND |
| 2022-05-31 | JH2204108-DIOXANE | ND |
| 2022-08-26 | JH2207425-DIOXANE | ND |
| 2022-08-26 | JH2207424-DIOXANE | ND |
| 2022-11-14 | JH2209835-DIOXANE | ND |
| 2022-11-14 | JH2209836-DIOXANE | ND |
| 2023-03-17 | JH2301973-DIOXANE | ND |
| 2023-03-17 | JH2301974-DIOXANE | ND |