1,4-Dioxane
California American Water Company - Coronado
NOTE: California American Water Company - Coronado purchases water from City of San Diego which is required to test for 1,4-dioxane. Sample information shown below was taken by City of San Diego.
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 | 4 | 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 | ND | 1 | 0 | ND |
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
NOTE: California American Water Company - Coronado purchases water from City of San Diego which is required to test for 1,4-dioxane. Sample information shown below was taken by City of San Diego.
Date | Lab ID | Result |
---|---|---|
2013-08-19 | 1308683-001D | ND |
2013-08-20 | 1308735-001D | ND |
2013-08-21 | 1308767-001D | ND |
2013-11-12 | 1311404-001D | ND |
2013-11-12 | 1311402-001D | ND |
2013-11-13 | 1311448-001D | ND |
2014-02-10 | 1402421-001D | ND |
2014-02-10 | 1402418-001D | ND |
2014-02-11 | 1402513-001D | ND |
2014-05-12 | 1405468-001D | ND |
2014-05-12 | 1405511-001D | ND |
2014-05-13 | 1405607-001D | ND |
2018-02-07 | 9437-030-0000 | ND |