1,4-Dioxane
Oro Valley Water Utility
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 |
---|---|---|---|---|
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 32 | 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 |
---|---|---|
2015-02-04 | 3181529 | ND |
2015-02-04 | 3181518 | ND |
2015-02-05 | 3182360 | ND |
2015-02-05 | 3182332 | ND |
2015-02-05 | 3182377 | ND |
2015-02-05 | 3182408 | ND |
2015-02-05 | 3182341 | ND |
2015-02-11 | 3186689 | ND |
2015-02-11 | 3186743 | ND |
2015-02-12 | 3187538 | ND |
2015-02-12 | 3187579 | ND |
2015-02-12 | 3187550 | ND |
2015-02-12 | 3187588 | ND |
2015-02-12 | 3187529 | ND |
2015-02-17 | 3189604 | ND |
2015-02-18 | 3190593 | ND |
2015-08-04 | 3293084 | ND |
2015-08-04 | 3293071 | ND |
2015-08-06 | 3294701 | ND |
2015-08-06 | 3294728 | ND |
2015-08-06 | 3294815 | ND |
2015-08-06 | 3294761 | ND |
2015-08-10 | 3296061 | ND |
2015-08-10 | 3296110 | ND |
2015-08-12 | 3299593 | ND |
2015-08-12 | 3299483 | ND |
2015-08-13 | 3300728 | ND |
2015-08-13 | 3300712 | ND |
2015-08-13 | 3300746 | ND |
2015-08-13 | 3300737 | ND |
2015-08-18 | 3303949 | ND |
2015-08-18 | 3303998 | ND |