1,4-Dioxane
Sacramento County Water Authority - Laguna/Vineyard
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 | ND | 18 | 0 | ND |
| 2014 | ND | 20 | 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 |
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 |
|---|---|---|
| 2013-10-16 | A3J0785-41A | ND |
| 2013-10-16 | A3J0785-53A | ND |
| 2013-10-16 | A3J0785-65A | ND |
| 2013-10-16 | A3J0785-69A | ND |
| 2013-10-16 | A3J0785-09A | ND |
| 2013-10-16 | A3J0785-61A | ND |
| 2013-10-16 | A3J0785-13A | ND |
| 2013-10-16 | A3J0785-29A | ND |
| 2013-10-16 | A3J0785-37A | ND |
| 2013-10-16 | A3J0785-49A | ND |
| 2013-10-16 | A3J0785-33A | ND |
| 2013-10-16 | A3J0785-45A | ND |
| 2013-10-16 | A3J0785-17A | ND |
| 2013-10-16 | A3J0785-25A | ND |
| 2013-10-16 | A3J0785-21A | ND |
| 2013-10-17 | A3J0785-57A | ND |
| 2013-10-17 | A3J0785-05A | ND |
| 2013-10-17 | A3J0785-01A | ND |
| 2014-03-26 | A4C1008-01A | ND |
| 2014-04-15 | A4D0298-46A | ND |
| 2014-04-15 | A4D0298-81A | ND |
| 2014-04-15 | A4D0298-21A | ND |
| 2014-04-15 | A4D0298-31A | ND |
| 2014-04-15 | A4D0298-51A | ND |
| 2014-04-15 | A4D0298-26A | ND |
| 2014-04-15 | A4D0298-36A | ND |
| 2014-04-15 | A4D0298-06A | ND |
| 2014-04-15 | A4D0298-56A | ND |
| 2014-04-15 | A4D0298-01A | ND |
| 2014-04-15 | A4D0298-41A | ND |
| 2014-04-15 | A4D0298-71A | ND |
| 2014-04-15 | A4D0298-16A | ND |
| 2014-04-15 | A4D0298-76A | ND |
| 2014-04-15 | A4D0298-11A | ND |
| 2014-04-15 | A4D0298-61A | ND |
| 2014-04-15 | A4D0298-66A | ND |
| 2014-04-16 | A4C2254-01A | ND |
| 2014-07-09 | A4F1957-01A | ND |