1,4-Dioxane
Dykeer 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.0239 ppb | 15 | 2 | ND - 0.200 ppb |
| 2022 | 0.0564 ppb | 14 | 8 | ND - 0.152 ppb |
| 2023 | 0.0939 ppb | 9 | 9 | 0.000110 ppb - 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 |
|---|---|---|
| 2021-01-07 | L2100951-04-PFAS | ND |
| 2021-01-07 | L2100951-03-PFAS | ND |
| 2021-01-07 | L2100951-05-PFAS | 0.200 ppb |
| 2021-01-07 | L2100951-02-PFAS | ND |
| 2021-05-04 | L2123105-04-PFAS | ND |
| 2021-05-04 | L2123105-02-PFAS | ND |
| 2021-05-04 | L2123105-03-PFAS | ND |
| 2021-05-04 | L2123105-05-PFAS | ND |
| 2021-07-20 | L2138909-05-PFAS | ND |
| 2021-07-20 | L2138909-03-PFAS | ND |
| 2021-07-20 | L2138909-04-PFAS | ND |
| 2021-07-20 | L2138909-02-PFAS | ND |
| 2021-12-01 | L2166855-03-PFAS | ND |
| 2021-12-01 | L2166855-02-PFAS | 0.158 ppb |
| 2021-12-01 | L2166855-04-PFAS | ND |
| 2022-02-15 | L2209126-01-PFAS | 0.152 ppb |
| 2022-02-15 | L2209126-02-PFAS | ND |
| 2022-02-15 | L2209126-03-PFAS | ND |
| 2022-06-19 | L2232816-02-PFAS | ND |
| 2022-06-19 | L2232816-01-PFAS | ND |
| 2022-06-19 | L2232816-03-PFAS | ND |
| 2022-08-09 | 70225337001-1,4-DIOX | 0.0840 ppb |
| 2022-08-09 | 70225337003-1,4-DIOX | 0.0770 ppb |
| 2022-08-09 | 70225337002-1,4-DIOX | 0.0670 ppb |
| 2022-12-14 | 22L1983-01-PFAS | 0.120 ppb |
| 2022-12-14 | 22L1983-09-PFAS | ND |
| 2022-12-14 | 22L1983-03-PFAS | 0.0800 ppb |
| 2022-12-14 | 22L1983-07-PFAS | 0.0900 ppb |
| 2022-12-14 | 22L1983-05-PFAS | 0.120 ppb |
| 2023-01-27 | 23A2749-02-1,4DIOXAN | 0.0770 ppb |
| 2023-07-19 | 23G2523-06-1,4DIOXAN | 0.0860 ppb |
| 2023-07-19 | 26G2523-01-1,4DIOXAN | 0.1000 ppb |
| 2023-07-19 | 23G2523-05-1,4DIOXAN | 0.200 ppb |
| 2023-07-19 | 23G2523-04-1,4DIOXAN | 0.000110 ppb |
| 2023-07-19 | 23G2523-03-1,4DIOXAN | 0.0680 ppb |
| 2023-07-19 | 23G2523-02-1,4DIOXAN | 0.0440 ppb |
| 2023-10-13 | 23J2006-10-1,4-DIOXA | 0.110 ppb |
| 2023-10-13 | 23J2006-09-1,4-DIOXA | 0.160 ppb |