1,4-Dioxane
City of Seal Beach
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 | 7 | 0 | ND |
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
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 |
|---|---|---|
| 2013-02-06 | 3010041802 | ND |
| 2013-02-06 | 3010041804 | ND |
| 2013-02-07 | 3010041806 | ND |
| 2013-06-10 | 3010041805-2 | ND |
| 2013-08-07 | 3010041804-2 | ND |
| 2013-08-07 | 3010041806-2 | ND |
| 2013-09-03 | 3010041805-3 | ND |
| 2014-01-30 | 4417-009-0955 | ND |
| 2014-01-30 | 4417-001-0930 | ND |
| 2014-01-30 | 4417-002-0900 | ND |
| 2014-02-25 | 4417-003-0740 | ND |
| 2015-01-20 | 4417-002-0830 | ND |
| 2015-01-20 | 4417-009-0805 | ND |
| 2016-01-27 | 4417-002-0930 | ND |
| 2016-01-27 | 4417-009-0910 | ND |
| 2017-01-12 | 4417-009-0835 | ND |
| 2017-01-12 | 4417-002-0815 | ND |
| 2018-01-16 | 4417-009-1100 | ND |
| 2018-01-16 | 4417-002-1030 | ND |
| 2018-02-27 | 4417-001-0930 | ND |
| 2018-05-16 | 4417-001-1100 | ND |
| 2019-01-24 | 4417-002-0905 | ND |
| 2019-01-24 | 4417-001-1005 | ND |
| 2019-03-14 | 4417-009-1335 | ND |