1,4-Dioxane
Ontario Municipal Utilities 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 |
|---|---|---|---|---|
| 2013 | 0.0278 ppb | 51 | 5 | ND - 0.420 ppb |
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 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 |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2013-06-04 | B3F0340-03 | ND |
| 2013-06-04 | B3F0340-05 | ND |
| 2013-06-04 | B3F0340-01 | ND |
| 2013-06-04 | B3F0340-07 | ND |
| 2013-06-04 | B3F0340-11 | ND |
| 2013-06-04 | B3F0340-09 | ND |
| 2013-06-05 | B3F0557-07 | ND |
| 2013-06-05 | B3F0557-09 | ND |
| 2013-06-05 | B3F0557-05 | ND |
| 2013-06-05 | B3F0557-03 | ND |
| 2013-06-05 | B3F0557-01 | ND |
| 2013-06-06 | B3F0707-05 | ND |
| 2013-06-06 | B3F0707-09 | ND |
| 2013-06-06 | B3F0707-01 | 0.170 ppb |
| 2013-06-06 | B3F0707-03 | ND |
| 2013-06-06 | B3F0707-07 | ND |
| 2013-06-06 | B3F0707-13 | ND |
| 2013-06-06 | B3F0707-11 | ND |
| 2013-06-07 | B3F0790-03 | ND |
| 2013-06-07 | B3F0790-07 | 0.270 ppb |
| 2013-06-07 | B3F0790-05 | ND |
| 2013-06-07 | B3F0790-01 | ND |
| 2013-06-07 | B3F0790-11 | ND |
| 2013-06-07 | B3F0790-13 | ND |
| 2013-06-07 | B3F0790-09 | 0.320 ppb |
| 2013-09-10 | B3I0873-04 | ND |
| 2013-09-10 | B3I0873-01 | ND |
| 2013-12-03 | B3L0312-10 | ND |
| 2013-12-03 | B3L0312-13 | ND |
| 2013-12-03 | B3L0312-16 | ND |
| 2013-12-03 | B3L0312-01 | ND |
| 2013-12-03 | B3L0312-07 | ND |
| 2013-12-03 | B3L0312-04 | ND |
| 2013-12-04 | B3L0477-04 | ND |
| 2013-12-04 | B3L0477-13 | ND |
| 2013-12-04 | B3L0477-10 | ND |
| 2013-12-04 | B3L0477-07 | ND |
| 2013-12-04 | B3L0477-01 | ND |
| 2013-12-05 | B3L0587-13 | ND |
| 2013-12-05 | B3L0587-16 | ND |
| 2013-12-05 | B3L0587-07 | ND |
| 2013-12-05 | B3L0587-10 | ND |
| 2013-12-05 | B3L0587-01 | ND |
| 2013-12-05 | B3L0587-04 | ND |
| 2013-12-06 | B3L0671-01 | ND |
| 2013-12-06 | B3L0671-07 | ND |
| 2013-12-06 | B3L0671-04 | ND |
| 2013-12-06 | B3L0658-04 | ND |
| 2013-12-06 | B3L0658-01 | ND |
| 2013-12-06 | B3L0658-07 | 0.420 ppb |
| 2013-12-06 | B3L0658-10 | 0.240 ppb |
| 2014-03-04 | B4C0458-01 | ND |
| 2014-03-04 | B4C0458-04 | ND |
| 2015-07-16 | B5G1760-01 | ND |