1,4-Dioxane
San Gabriel Valley Water Company - Fontana
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 |
|---|---|---|---|---|
| 2014 | ND | 32 | 0 | ND |
| 2015 | ND | 8 | 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 |
|---|---|---|
| 2014-04-17 | 4D17067-01A | ND |
| 2014-04-17 | 4D17067-05A | ND |
| 2014-04-17 | 4D17067-03A | ND |
| 2014-04-23 | 4D23055-05A | ND |
| 2014-04-23 | 4D23055-03A | ND |
| 2014-04-23 | 4D23055-07A | ND |
| 2014-04-23 | 4D23055-01A | ND |
| 2014-04-23 | 4D23055-09A | ND |
| 2014-04-24 | 4D24063-01A | ND |
| 2014-04-24 | 4D24063-07A | ND |
| 2014-04-24 | 4D24063-03A | ND |
| 2014-04-24 | 4D24063-05A | ND |
| 2014-07-10 | 4G10140-01A | ND |
| 2014-07-10 | 4G10140-03A | ND |
| 2014-07-10 | 4G10139-05A | ND |
| 2014-07-10 | 4G10139-03A | ND |
| 2014-07-10 | 4G10139-01A | ND |
| 2014-07-24 | 4G24064-01A | ND |
| 2014-07-24 | 4G24064-05A | ND |
| 2014-07-24 | 4G24064-03A | ND |
| 2014-10-06 | 4J06076-05A | ND |
| 2014-10-06 | 4J06076-03A | ND |
| 2014-10-06 | 4J06076-01A | ND |
| 2014-10-17 | 4J17097-09A | ND |
| 2014-10-17 | 4J17097-05A | ND |
| 2014-10-17 | 4J17097-03A | ND |
| 2014-10-17 | 4J17097-07A | ND |
| 2014-10-17 | 4J17097-01A | ND |
| 2014-10-20 | 4J20058-07A | ND |
| 2014-10-20 | 4J20058-03A | ND |
| 2014-10-20 | 4J20058-01A | ND |
| 2014-10-20 | 4J20058-05A | ND |
| 2015-01-08 | 5A08066-03A | ND |
| 2015-01-08 | 5A08066-01A | ND |
| 2015-01-08 | 5A08066-05A | ND |
| 2015-01-15 | 5A15052-05A | ND |
| 2015-01-15 | 5A15052-03A | ND |
| 2015-01-15 | 5A15052-01A | ND |
| 2015-01-22 | 5A23020-01A | ND |
| 2015-01-22 | 5A23020-03A | ND |