1,4-Dioxane
Manhasset Lakeville 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 |
|---|---|---|---|---|
| 2014 | 0.233 ppb | 11 | 6 | ND - 0.680 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 0.1000 ppb | 1 | 1 | 0.1000 ppb |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 0.0883 ppb | 6 | 1 | ND - 0.530 ppb |
| 2019 | 0.193 ppb | 6 | 3 | ND - 1.000 ppb |
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 |
|---|---|---|
| 2014-04-22 | UCMR3 T09308 | ND |
| 2014-04-22 | UCMR3 T13749 | ND |
| 2014-04-22 | UCMR3 T12802 | ND |
| 2014-04-22 | UCMR3 T13704 | 0.380 ppb |
| 2014-04-24 | UCMR3 T10889 | 0.680 ppb |
| 2014-04-24 | UCMR3 T7126T7892 | 0.0980 ppb |
| 2014-04-29 | UCMR3 T7651 | 0.360 ppb |
| 2014-06-23 | 11509 062014 | 0.470 ppb |
| 2014-06-30 | 01328 062014 | ND |
| 2014-12-30 | 01328 122014 | ND |
| 2014-12-30 | 11509 122014 | 0.570 ppb |
| 2016-09-27 | 1609N63-002A | 0.1000 ppb |
| 2018-03-01 | 7044254001 | ND |
| 2018-03-01 | 7044254002 | ND |
| 2018-08-22 | 7062467001 | 0.530 ppb |
| 2018-08-23 | 7062640001 | ND |
| 2018-08-23 | 7062640002 | ND |
| 2018-08-29 | 7063131005-POCS | ND |
| 2019-03-14 | 7082388003 | 0.0930 ppb |
| 2019-03-19 | 7082777002 | 0.0660 ppb |
| 2019-03-26 | 7083470001 | ND |
| 2019-03-26 | 7083470002 | ND |
| 2019-09-12 | 70104737003-POCS | 1.000 ppb |
| 2019-10-29 | 70110021006 | ND |