1,4-Dioxane
Mount Kisco Water Department
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 | ND | 6 | 0 | ND |
| 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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 17 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | 0.00917 ppb | 6 | 2 | ND - 0.0340 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 |
|---|---|---|
| 2014-03-11 | 105945P | ND |
| 2014-03-11 | 105946P | ND |
| 2014-06-09 | 107617P | ND |
| 2014-09-17 | 109093P | ND |
| 2014-09-17 | 109092P | ND |
| 2014-12-10 | 110736P | ND |
| 2020-09-30 | L2042060-01-PFAS | ND |
| 2020-12-14 | L2056481-03-PFAS | ND |
| 2020-12-14 | L2056481-05-PFAS | ND |
| 2020-12-14 | L2056481-01-PFAS | ND |
| 2020-12-14 | L2056481-06-PFAS | ND |
| 2020-12-14 | L2056481-04-PFAS | ND |
| 2021-03-29 | L2116246-06-PFAS | ND |
| 2021-03-29 | L2116246-05-PFAS | ND |
| 2021-03-29 | L2116246-04-PFAS | ND |
| 2021-03-29 | L2116246-02-PFAS | ND |
| 2021-03-29 | L2116246-01-PFAS | ND |
| 2021-05-12 | L212522-05-PFAS | ND |
| 2021-05-12 | L2125221-03-PFAS | ND |
| 2021-05-12 | L2125221-04-PFAS | ND |
| 2021-05-12 | L212522-06-PFAS | ND |
| 2021-08-24 | L2145595-07-PFAS | ND |
| 2021-08-24 | L2145595-01-PFAS | ND |
| 2021-08-24 | L2145595-05-PFAS | ND |
| 2021-08-24 | L21445595-06-PFAS | ND |
| 2021-11-15 | L2163351-06-PFAS | ND |
| 2021-11-15 | L2163351-07-PFAS | ND |
| 2021-11-15 | L216335-01-PFAS | ND |
| 2021-11-15 | L2163351-05-PFAS | ND |
| 2022-08-15 | 420-232326-6-PFAS | ND |
| 2022-08-15 | 420-232326-1-PFAS | ND |
| 2022-08-15 | 420-232326-7-PFAS | ND |
| 2022-08-15 | 420-232326-5-PFAS | ND |
| 2023-09-25 | AZ17750-PFAS | ND |
| 2023-09-25 | AZ17747-PFAS | 0.0210 ppb |
| 2023-09-25 | AZ17748-PFAS | ND |
| 2023-09-25 | AZ17749-PFAS | 0.0340 ppb |
| 2023-09-25 | AZ17746-PFAS | ND |
| 2023-12-11 | AZ22401-PFAS | ND |