1,4-Dioxane
San Bernardino City
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 | 0.0200 ppb | 23 | 5 | ND - 0.120 ppb |
| 2014 | 0.0203 ppb | 23 | 6 | ND - 0.0830 ppb |
| 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 |
|---|---|---|
| 2013-07-17 | 201307170652AM | 0.0990 ppb |
| 2013-07-17 | 201307170646AM | 0.0720 ppb |
| 2013-07-17 | 201307170654AM | 0.120 ppb |
| 2013-07-17 | 201307170686AM | ND |
| 2013-07-17 | 201307170684AM | ND |
| 2013-07-17 | 201307170676AM | ND |
| 2013-07-17 | 201307170648AM | ND |
| 2013-07-17 | 201307170656AM | ND |
| 2013-07-17 | 201307170682AM | ND |
| 2013-07-17 | 201307170658AM | 0.0850 ppb |
| 2013-07-17 | 201307170650AM | 0.0840 ppb |
| 2013-07-17 | 201307170678AM | ND |
| 2013-07-17 | 201307170680AM | ND |
| 2013-07-18 | 201307180867AM | ND |
| 2013-07-18 | 201307180859AM | ND |
| 2013-07-18 | 201307180857AM | ND |
| 2013-07-18 | 201307180863AM | ND |
| 2013-07-18 | 201307180871AM | ND |
| 2013-07-18 | 201307180873AM | ND |
| 2013-07-18 | 201307180865AM | ND |
| 2013-07-18 | 201307180855AM | ND |
| 2013-07-18 | 201307180861AM | ND |
| 2013-07-18 | 201307180869AM | ND |
| 2014-01-22 | 201401220695AM | 0.0750 ppb |
| 2014-01-22 | 201401220697AM | ND |
| 2014-01-22 | 201401220691AM | ND |
| 2014-01-22 | 201401220699AM | ND |
| 2014-01-22 | 201401220693AM | ND |
| 2014-01-22 | 201401220687AM | 0.0820 ppb |
| 2014-01-22 | 201401220685AM | 0.0760 ppb |
| 2014-01-22 | 201401220701AM | ND |
| 2014-01-22 | 201401220681AM | 0.0720 ppb |
| 2014-01-22 | 201401220689AM | 0.0790 ppb |
| 2014-01-22 | 201401220683AM | 0.0830 ppb |
| 2014-01-22 | 201401220703AM | ND |
| 2014-01-22 | 201401220705AM | ND |
| 2014-01-23 | 201401230649AM | ND |
| 2014-01-23 | 201401230657AM | ND |
| 2014-01-23 | 201401230626AM | ND |
| 2014-01-23 | 201401230620AM | ND |
| 2014-01-23 | 201401230628AM | ND |
| 2014-01-23 | 201401230653AM | ND |
| 2014-01-23 | 201401230655AM | ND |
| 2014-01-23 | 201401230624AM | ND |
| 2014-01-23 | 201401230651AM | ND |
| 2014-01-23 | 201401230622AM | ND |