1,4-Dioxane
Santa Clarita Water Division
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 | 26 | 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 |
|---|---|---|
| 2014-01-16 | 201401170103AM | ND |
| 2014-01-16 | 201401170105AM | ND |
| 2014-04-09 | 201404110132AM | ND |
| 2014-04-09 | 201404110118AM | ND |
| 2014-04-09 | 201404110130AM | ND |
| 2014-04-09 | 201404110093AM | ND |
| 2014-04-09 | 201404110126AM | ND |
| 2014-04-09 | 201404110128AM | ND |
| 2014-04-09 | 201404110068AM | ND |
| 2014-04-09 | 201404110120AM | ND |
| 2014-04-10 | 201404110110AM | ND |
| 2014-04-10 | 201404110099AM | ND |
| 2014-05-01 | 201405020138AM | ND |
| 2014-05-01 | 201405020137AM | ND |
| 2014-07-16 | 201407160902AM | ND |
| 2014-07-16 | 201407160886AM | ND |
| 2014-10-15 | 201410150597AM | ND |
| 2014-10-15 | 201410150577AM | ND |
| 2014-10-15 | 201410150595AM | ND |
| 2014-10-15 | 201410150579AM | ND |
| 2014-10-15 | 201410150583AM | ND |
| 2014-10-15 | 201410150593AM | ND |
| 2014-10-15 | 201410150599AM | ND |
| 2014-10-15 | 201410150581AM | ND |
| 2014-10-15 | 201410150585AM | ND |
| 2014-10-15 | 201410150591AM | ND |