1,4-Dioxane
City of Glendale
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 | 0.0185 ppb | 26 | 2 | ND - 0.240 ppb |
| 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 |
|---|---|---|
| 2013-06-03 | 201306030205AM | ND |
| 2013-06-03 | 201306030201AM | ND |
| 2013-06-03 | 201306030203AM | ND |
| 2013-06-03 | 201306030207AM | 0.240 ppb |
| 2013-06-05 | 201306050320AM | ND |
| 2013-06-05 | 201306050318AM | ND |
| 2013-06-12 | 201306120309AM | ND |
| 2013-06-12 | 201306120311AM | ND |
| 2013-06-12 | 201306120313AM | ND |
| 2013-06-24 | 201306240072AM | ND |
| 2013-09-03 | 201309030164AM | ND |
| 2013-09-03 | 201309030166AM | ND |
| 2013-09-03 | 201309030162AM | ND |
| 2013-09-12 | 201309120358AM | ND |
| 2013-09-26 | 201309260282AM | ND |
| 2013-12-02 | 201312020138AM | ND |
| 2013-12-02 | 201312020136AM | ND |
| 2013-12-02 | 201312020140AM | ND |
| 2013-12-04 | 201312040826AM | ND |
| 2013-12-04 | 201312040824AM | ND |
| 2013-12-04 | 201312040820AM | 0.240 ppb |
| 2013-12-04 | 201312040822AM | ND |
| 2013-12-09 | 201312090096AM | ND |
| 2013-12-10 | 201312100490AM | ND |
| 2013-12-10 | 201312100488AM | ND |
| 2013-12-10 | 201312100492AM | ND |
| 2014-01-16 | 201401160466AM | ND |
| 2014-03-03 | 201403030040AM | ND |
| 2014-03-03 | 201403030038AM | ND |
| 2014-03-27 | 201403270383AM | ND |