1,4-Dioxane
Greenlawn 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.328 ppb | 19 | 17 | ND - 1.30 ppb |
| 2014 | 1.60 ppb | 1 | 1 | 1.60 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 |
|---|---|---|
| 2013-06-25 | 78175 | 0.120 ppb |
| 2013-06-25 | 78181 | 0.110 ppb |
| 2013-06-25 | 78268 | ND |
| 2013-06-25 | 78260 | 0.870 ppb |
| 2013-06-25 | 78167 | 0.140 ppb |
| 2013-06-26 | 78178 | 0.320 ppb |
| 2013-06-26 | 78263 | 1.30 ppb |
| 2013-06-26 | 78183 | 0.330 ppb |
| 2013-06-26 | 78266 | 0.370 ppb |
| 2013-06-26 | 78170 | 0.250 ppb |
| 2013-12-12 | 78170 (DECEMBER) | 0.270 ppb |
| 2013-12-12 | 78175 (DECEMBER) | 0.0900 ppb |
| 2013-12-12 | 78181 (DECEMBER) | 0.210 ppb |
| 2013-12-12 | 78178 (DECEMBER) | 0.300 ppb |
| 2013-12-12 | 78167 (DECEMBER) | 0.1000 ppb |
| 2013-12-16 | 78266 (EP009) | 0.320 ppb |
| 2013-12-16 | 78268 (EP010) | ND |
| 2013-12-16 | 78183 (EP006) | 0.350 ppb |
| 2013-12-16 | 78260 (EP007) | 0.780 ppb |
| 2014-11-17 | 78263 112014 | 1.60 ppb |