1,4-Dioxane
Candlewood Park Water District
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 | ND | 2 | 0 | ND |
| 2021 | ND | 8 | 0 | ND |
| 2022 | 0.00800 ppb | 3 | 1 | ND - 0.0240 ppb |
| 2023 | 0.1000 ppb | 2 | 1 | ND - 0.200 ppb |
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 |
|---|---|---|
| 2020-11-03 | 420-184418-4-PFAS | ND |
| 2020-11-17 | 420-185507-1-PFAS | ND |
| 2021-02-16 | L2107750-01-PFAS | ND |
| 2021-02-16 | L2107750-03-PFAS | ND |
| 2021-05-05 | L2123478-01-PFAS | ND |
| 2021-05-05 | L2123478-03-PFAS | ND |
| 2021-08-31 | L2147014-01-PFAS | ND |
| 2021-08-31 | L2147014-03-PFAS | ND |
| 2021-11-17 | L2163681-02-PFAS | ND |
| 2021-11-17 | L2163681-PFAS | ND |
| 2022-05-31 | 22F0195-01-PFAS | 0.0240 ppb |
| 2022-05-31 | 22F0195-03-PFAS | ND |
| 2022-08-09 | 420-231874-1-PFAS | ND |
| 2023-04-12 | CN82716-PFAS | 0.200 ppb |
| 2023-07-19 | CO54708-PFAS | ND |