1,4-Dioxane
La Verne WD
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 | 0.0905 ppb | 14 | 6 | ND - 0.440 ppb |
2015 | ND | 2 | 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 |
---|---|---|
2014-02-20 | 4790-008-0911 | ND |
2014-02-20 | 4790-009-1021 | ND |
2014-02-20 | 4790-010-0901 | 0.270 ppb |
2014-02-20 | 4790-012-1100 | 0.310 ppb |
2014-02-20 | 4790-016-0955 | 0.440 ppb |
2014-02-20 | 4790-032-0930 | ND |
2014-02-20 | 4790-039-0828 | ND |
2014-03-12 | 4790-046-1139 | ND |
2014-04-21 | B4D2156-03 | 0.1000 ppb |
2014-04-21 | B4D2156-01 | ND |
2014-07-21 | B4G2219-03 | 0.0700 ppb |
2014-07-21 | B4G2219-01 | ND |
2014-10-13 | B4J1322-03 | 0.0770 ppb |
2014-10-13 | B4J1322-01 | ND |
2015-01-12 | B5A1037-03 | ND |
2015-01-12 | B5A1037-01 | ND |