1,4-Dioxane
North Alamo Water Supply Company
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 | ND | 22 | 0 | ND |
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 |
---|---|---|
2013-03-27 | 1303952-021B | ND |
2013-03-27 | 1303952-023B | ND |
2013-03-27 | 1303952-017B | ND |
2013-03-27 | 1303952-015B | ND |
2013-03-27 | 1303952-025B | ND |
2013-03-27 | 1303952-019B | ND |
2013-06-17 | Q1302491001 | ND |
2013-06-17 | Q1302491005 | ND |
2013-06-17 | Q1302491003 | ND |
2013-06-17 | Q1302491007 | ND |
2013-06-17 | Q1302491009 | ND |
2013-09-19 | Q1307746005 | ND |
2013-09-19 | Q1307746011 | ND |
2013-09-19 | Q1307746007 | ND |
2013-09-19 | Q1307746001 | ND |
2013-09-19 | Q1307746003 | ND |
2013-09-19 | Q1307746009 | ND |
2013-12-10 | Q1316886003 | ND |
2013-12-10 | Q1316886001 | ND |
2013-12-10 | Q1316886007 | ND |
2013-12-10 | Q1316886009 | ND |
2013-12-10 | Q1316886005 | ND |