1,4-Dioxane
Rockland Mobile Home Park
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 | 0.929 ppb | 2 | 2 | 0.898 ppb - 0.960 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 0.940 ppb | 1 | 1 | 0.940 ppb |
| 2020 | 0.692 ppb | 5 | 5 | 0.0900 ppb - 1.04 ppb |
| 2021 | 0.0233 ppb | 3 | 1 | ND - 0.0700 ppb |
| 2022 | 0.180 ppb | 4 | 1 | ND - 0.720 ppb |
| 2023 | 0.848 ppb | 4 | 4 | 0.820 ppb - 0.890 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 |
|---|---|---|
| 2014-02-05 | 104861P | 0.960 ppb |
| 2014-08-19 | 108854Q | 0.898 ppb |
| 2019-09-16 | 1908245-001 | 0.940 ppb |
| 2020-01-13 | 46785601 | 0.700 ppb |
| 2020-01-28 | 47837401 | 0.710 ppb |
| 2020-04-27 | 2004B01-001A | 0.0900 ppb |
| 2020-09-15 | 2008N24-001A | 1.04 ppb |
| 2020-12-08 | 2011A91-001A | 0.920 ppb |
| 2021-03-30 | 2103R11-001A | ND |
| 2021-06-29 | 2106U01-001A | 0.0700 ppb |
| 2021-12-17 | 2111K36-001A | ND |
| 2022-03-30 | 2109R21-001A | ND |
| 2022-03-30 | 2203S94-001A | ND |
| 2022-06-15 | 2205B98-001A | 0.720 ppb |
| 2022-09-15 | 2209D73-001A | ND |
| 2023-03-16 | 2303F44-001A | 0.850 ppb |
| 2023-06-28 | 2306O39-001A | 0.890 ppb |
| 2023-07-19 | 2307F51-001A | 0.820 ppb |
| 2023-10-17 | 2310E70-001A | 0.830 ppb |