1,4-Dioxane
Carmel Water District 3
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 | 2 | 0 | ND |
| 2022 | 0.0662 ppb | 13 | 1 | ND - 0.860 ppb |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2021-05-19 | CI35142 | ND |
| 2021-07-07 | CI69415 | ND |
| 2022-04-27 | CL17972 | ND |
| 2022-07-06 | CL71012 | ND |
| 2022-07-06 | CL71014 | ND |
| 2022-07-27 | CL90397 | ND |
| 2022-10-05 | CM50196 | ND |
| 2022-10-05 | CM50201 | ND |
| 2022-10-05 | CM50203 | ND |
| 2022-10-05 | CM50198 | ND |
| 2022-10-05 | CM50197 | ND |
| 2022-10-19 | CM66326 | ND |
| 2022-10-19 | CM66325 | ND |
| 2022-10-19 | CM66324 | ND |
| 2022-11-01 | CM74682 | 0.860 ppb |
| 2023-01-11 | CN21618 | ND |
| 2023-01-11 | CN21616 | ND |
| 2023-01-25 | CN30096 | ND |
| 2023-05-17 | CO02886PFO | ND |
| 2023-05-17 | CO02888PFO | ND |
| 2023-05-31 | CO13337PFO | ND |
| 2023-06-01 | CO13339 | ND |
| 2023-08-09 | CO70650PFO | ND |
| 2023-08-17 | CO70648PFO | ND |
| 2023-09-06 | CO91842PFO | ND |