1,4-Dioxane
Security Waster District
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 | 0.0734 ppb | 38 | 26 | ND - 0.170 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 | Result |
|---|---|
| 2014-01-14 | 0.0800 ppb |
| 2014-01-14 | 0.1000 ppb |
| 2014-01-14 | 0.1000 ppb |
| 2014-01-14 | ND |
| 2014-01-14 | 0.130 ppb |
| 2014-01-15 | ND |
| 2014-01-15 | ND |
| 2014-01-15 | ND |
| 2014-01-21 | 0.0800 ppb |
| 2014-01-21 | 0.1000 ppb |
| 2014-01-21 | 0.0900 ppb |
| 2014-01-21 | 0.0900 ppb |
| 2014-01-22 | ND |
| 2014-01-22 | 0.1000 ppb |
| 2014-01-22 | 0.0900 ppb |
| 2014-01-22 | 0.1000 ppb |
| 2014-01-29 | ND |
| 2014-04-21 | ND |
| 2014-04-22 | 0.110 ppb |
| 2014-07-15 | 0.120 ppb |
| 2014-07-29 | 0.170 ppb |
| 2014-07-29 | 0.140 ppb |
| 2014-07-29 | 0.1000 ppb |
| 2014-07-29 | 0.150 ppb |
| 2014-07-30 | 0.110 ppb |
| 2014-07-30 | ND |
| 2014-07-30 | ND |
| 2014-07-30 | ND |
| 2014-07-30 | 0.110 ppb |
| 2014-07-30 | 0.120 ppb |
| 2014-07-30 | 0.110 ppb |
| 2014-07-30 | 0.120 ppb |
| 2014-07-30 | 0.120 ppb |
| 2014-07-30 | 0.0800 ppb |
| 2014-07-31 | 0.0800 ppb |
| 2014-07-31 | ND |
| 2014-08-11 | 0.0900 ppb |
| 2014-10-27 | ND |