1,4-Dioxane
Cliffdale West
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.0589 ppb | 53 | 16 | ND - 1.10 ppb |
| 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 |
|---|---|---|
| 2014-03-10 | 201403110248AM | ND |
| 2014-03-10 | 201403110485AM | 1.10 ppb |
| 2014-03-10 | 201403110492AM | ND |
| 2014-03-10 | 201403110323AM | ND |
| 2014-03-11 | 201403120601AM | 0.1000 ppb |
| 2014-03-11 | 201403120770AM | ND |
| 2014-03-11 | 201403121138AM | ND |
| 2014-03-11 | 201403120774AM | ND |
| 2014-03-12 | 201403130412AM | ND |
| 2014-03-12 | 201403130416AM | ND |
| 2014-03-12 | 201403130414AM | ND |
| 2014-03-13 | 201403130209AM | 0.110 ppb |
| 2014-03-13 | 201403140275AM | 0.110 ppb |
| 2014-03-13 | 201403140170AM | 0.0840 ppb |
| 2014-03-13 | 201403140164AM | 0.140 ppb |
| 2014-03-17 | 201403180201AM | ND |
| 2014-03-17 | 201403180203AM | 0.220 ppb |
| 2014-03-17 | 201403180227AM | ND |
| 2014-03-18 | 201403190659AM | ND |
| 2014-03-18 | 201403190705AM | ND |
| 2014-03-19 | 201403200581AM | ND |
| 2014-03-31 | 201404010147AM | ND |
| 2014-04-08 | 201404090755AM | ND |
| 2014-04-08 | 201404090604AM | 0.170 ppb |
| 2014-04-08 | 201404090616AM | ND |
| 2014-04-08 | 201404090599AM | ND |
| 2014-09-09 | 201409100871AM | 0.160 ppb |
| 2014-09-09 | 201409100869AM | ND |
| 2014-09-09 | 201409110337AM | ND |
| 2014-09-09 | 201409110315 | ND |
| 2014-09-09 | 201409100887AM | 0.180 ppb |
| 2014-09-09 | 201409101002AM | 0.150 ppb |
| 2014-09-09 | 201409100791AM | 0.1000 ppb |
| 2014-09-09 | 201409100817AM | 0.110 ppb |
| 2014-09-10 | 201409110661AM | ND |
| 2014-09-10 | 201409110838AM | 0.140 ppb |
| 2014-09-10 | 201409110590AM | ND |
| 2014-09-10 | 201409110637AM | ND |
| 2014-09-10 | 201409110794AM | ND |
| 2014-09-11 | 201409120829AM | 0.150 ppb |
| 2014-09-11 | 201409120590AM | ND |
| 2014-09-11 | 201409120582AM | ND |
| 2014-09-15 | 201409180321AM | ND |
| 2014-09-16 | 201409170728AM | 0.0970 ppb |
| 2014-09-17 | 201409190242AM | ND |
| 2014-09-17 | 201409180633AM | ND |
| 2014-09-17 | 201409190284AM | ND |
| 2014-09-17 | 201409190313AM | ND |
| 2014-09-18 | 201409190445AM | ND |
| 2014-10-29 | 201410300421AM | ND |
| 2014-11-13 | 201411150172AM | ND |
| 2014-11-13 | 201411150168AM | ND |
| 2014-11-13 | 201411150169AM | ND |