1,4-Dioxane
City of League 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 |
|---|---|---|---|---|
| 2014 | ND | 9 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 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 |
|---|---|---|
| 2014-09-09 | Q1442411021 | ND |
| 2014-09-09 | Q1442411005 | ND |
| 2014-09-09 | Q1442411009 | ND |
| 2014-09-09 | Q1442411001 | ND |
| 2014-09-09 | Q1442411017 | ND |
| 2014-09-09 | Q1442411013 | ND |
| 2014-09-09 | Q1442411025 | ND |
| 2014-12-08 | Q1458833005 | ND |
| 2014-12-08 | Q1458833001 | ND |
| 2015-03-17 | Q1509730017 | ND |
| 2015-03-17 | Q1509730009 | ND |
| 2015-03-17 | Q1509730013 | ND |
| 2015-03-17 | Q1509730021 | ND |
| 2015-03-17 | Q1509730001 | ND |
| 2015-03-17 | Q1509730005 | ND |
| 2015-06-24 | Q1523686005 | ND |
| 2015-06-24 | Q1523686001 | ND |