1,4-Dioxane
City of Scottsdale
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 | 0.0593 ppb | 21 | 4 | ND - 0.550 ppb |
| 2015 | 0.270 ppb | 1 | 1 | 0.270 ppb |
| 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 |
|---|---|---|
| 2014-02-10 | 201402100091AM | ND |
| 2014-02-10 | 201402100089AM | ND |
| 2014-02-10 | 201402100087AM | ND |
| 2014-02-10 | 201402100085AM | 0.540 ppb |
| 2014-02-11 | 201402120493AM | ND |
| 2014-02-12 | 201402120499AM | ND |
| 2014-02-13 | 201402130341AM | ND |
| 2014-02-13 | 201402130339AM | ND |
| 2014-05-14 | 201405140663AM | ND |
| 2014-05-14 | 201405140673AM | ND |
| 2014-08-05 | 201408050563AM | 0.550 ppb |
| 2014-08-05 | 201408050592AM | ND |
| 2014-08-05 | 201408050565AM | ND |
| 2014-08-07 | 201408070363AM | ND |
| 2014-08-07 | 201408070361AM | ND |
| 2014-08-14 | 201408140538AM | ND |
| 2014-08-21 | 201408220384AM | ND |
| 2014-08-26 | 201408260309AM | ND |
| 2014-08-27 | 201408270707AM | 0.0710 ppb |
| 2014-11-10 | 201411100071AM | 0.0850 ppb |
| 2014-11-10 | 201411100059AM | ND |
| 2015-03-05 | 201503050032AM | 0.270 ppb |