1,4-Dioxane
Missouri American St. Louis County & St. Charles County
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | 0.0230 ppb | 20 | 4 | ND - 0.150 ppb |
2014 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2013-02-05 | 21019901 | 0.0800 ppb |
2013-02-05 | 21018301 | 0.150 ppb |
2013-02-05 | 21020101 | ND |
2013-02-06 | 21017401 | ND |
2013-02-06 | 21016401 | ND |
2013-05-09 | 21798501 | ND |
2013-05-09 | 21801001 | ND |
2013-05-09 | 21801201 | ND |
2013-05-09 | 21799401 | ND |
2013-05-09 | 21797501 | 0.0900 ppb |
2013-08-08 | 23174401 | ND |
2013-08-08 | 23172801 | ND |
2013-08-08 | 23171901 | ND |
2013-08-08 | 23174601 | ND |
2013-08-08 | 23170901 | ND |
2013-11-05 | 23931601 | 0.140 ppb |
2013-11-05 | 23933501 | ND |
2013-11-06 | 23935301 | ND |
2013-11-06 | 23932601 | ND |
2013-11-06 | 23935101 | ND |