1,4-Dioxane
Clear Lake City Water Authority
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | ND | 18 | 0 | ND |
2014 | ND | 4 | 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 |
---|---|---|
2013-04-09 | 713558-8688 | ND |
2013-04-09 | 713544-8688 | ND |
2013-04-09 | 713556-8688 | ND |
2013-04-09 | 713560-8688 | ND |
2013-04-09 | 713542-8632 | ND |
2013-04-09 | 713562-8688 | ND |
2013-04-09 | 713554-8688 | ND |
2013-08-15 | 738673-9674 | ND |
2013-08-15 | 738670-9674 | ND |
2013-08-15 | 738675-9674 | ND |
2013-08-15 | 738674-9674 | ND |
2013-10-08 | 751367-10065 | ND |
2013-10-08 | 751277-10065 | ND |
2013-10-08 | 751267-10065 | ND |
2013-10-08 | 751296-10065 | ND |
2013-10-08 | 751262-10035 | ND |
2013-10-08 | 751275-10065 | ND |
2013-10-08 | 751283-10065 | ND |
2014-01-08 | 765722-10556 | ND |
2014-01-08 | 765736-10566 | ND |
2014-01-08 | 765714-10556 | ND |
2014-01-08 | 765716-10556 | ND |