1,4-Dioxane
Bellflower Home Gardens 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 |
|---|---|---|---|---|
| 2018 | 2.18 ppb | 20 | 20 | 1.60 ppb - 3.20 ppb |
| 2019 | 2.09 ppb | 19 | 19 | 1.50 ppb - 2.90 ppb |
| 2020 | 1.87 ppb | 20 | 20 | 1.10 ppb - 2.30 ppb |
| 2021 | 1.67 ppb | 19 | 18 | ND - 2.50 ppb |
| 2022 | 1.97 ppb | 20 | 20 | 1.30 ppb - 2.90 ppb |
| 2023 | 1.66 ppb | 15 | 15 | 0.990 ppb - 2.10 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 |
|---|