1,4-Dioxane
Crescenta Valley CWD
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 | 0.134 ppb | 16 | 10 | ND - 0.281 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 |
---|---|---|
2013-03-20 | 201303200374AM | 0.270 ppb |
2013-03-20 | 201303200397AM | ND |
2013-03-20 | 201303200372AM | 0.281 ppb |
2013-03-20 | 201303200391AM | 0.271 ppb |
2013-03-20 | 201303200432AM | 0.260 ppb |
2013-03-20 | 201303200376AM | 0.194 ppb |
2013-04-23 | 201304230533AM | ND |
2013-06-03 | 201306040462AM | ND |
2013-09-17 | 201309170865AM | ND |
2013-09-17 | 201309170925AM | 0.250 ppb |
2013-09-17 | 201309170920AM | ND |
2013-09-17 | 201309170918AM | 0.220 ppb |
2013-09-17 | 201309170832AM | 0.110 ppb |
2013-09-17 | 201309170916AM | 0.200 ppb |
2013-09-17 | 201309170922AM | 0.0950 ppb |
2013-12-10 | 201312110520AM | ND |