1,4-Dioxane
Mineola
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 | 0.296 ppb | 5 | 4 | ND - 0.650 ppb |
| 2014 | 0.207 ppb | 3 | 2 | ND - 0.390 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 0.718 ppb | 8 | 6 | ND - 3.90 ppb |
| 2019 | 0.358 ppb | 29 | 24 | ND - 1.70 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 |
|---|---|---|
| 2013-10-18 | 91004 | 0.300 ppb |
| 2013-10-21 | 90097 | 0.200 ppb |
| 2013-10-22 | 91002 | 0.330 ppb |
| 2013-10-22 | 91003 | ND |
| 2013-10-25 | 91001 | 0.650 ppb |
| 2014-04-22 | 90097 04/22/2014 | 0.230 ppb |
| 2014-04-24 | UCMR3 EP005 | ND |
| 2014-04-24 | UCMR3 EP006 | 0.390 ppb |
| 2018-07-31 | 7059954002 | ND |
| 2018-07-31 | 7059955001 | 0.290 ppb |
| 2018-07-31 | 7059954003 | 0.250 ppb |
| 2018-07-31 | 7059954001 | 3.90 ppb |
| 2018-11-27 | 7072119002 | ND |
| 2018-11-27 | 7072119003 | 0.310 ppb |
| 2018-11-27 | 7072119001 | 0.370 ppb |
| 2018-12-18 | 7073566001 | 0.620 ppb |
| 2019-02-19 | 7080025001 | 0.0230 ppb |
| 2019-03-26 | 7083451004 | 0.600 ppb |
| 2019-03-26 | 7083451002 | 0.320 ppb |
| 2019-03-26 | 7083451003 | 0.240 ppb |
| 2019-03-26 | 7083451001 | ND |
| 2019-04-30 | 7087692002 | ND |
| 2019-04-30 | 7087692003 | 0.0630 ppb |
| 2019-04-30 | 7087692001 | 0.240 ppb |
| 2019-05-07 | 7088477002 | ND |
| 2019-05-07 | 7088477001 | 0.310 ppb |
| 2019-05-07 | 7088477003 | 0.230 ppb |
| 2019-06-18 | 7094192001 | 0.0230 ppb |
| 2019-06-18 | 7094192003 | 0.650 ppb |
| 2019-06-18 | 7094192002 | 0.350 ppb |
| 2019-07-16 | 7097695001 | 0.880 ppb |
| 2019-07-30 | 7099367004 | 0.950 ppb |
| 2019-07-30 | 7099367003 | 0.290 ppb |
| 2019-07-30 | 7099367002 | 0.0260 ppb |
| 2019-07-30 | 7099367001 | 0.240 ppb |
| 2019-08-21 | 70102267003 | 0.330 ppb |
| 2019-08-21 | 70102267001 | 1.60 ppb |
| 2019-08-21 | 70102267005 | 0.320 ppb |
| 2019-08-21 | 70102267007 | ND |
| 2019-09-10 | 70104419003 | 0.390 ppb |
| 2019-09-10 | 70104419002 | 0.340 ppb |
| 2019-09-10 | 70104419001 | 1.70 ppb |
| 2019-09-10 | 70104419004 | 0.0330 ppb |
| 2019-11-06 | 70110908001 | ND |
| 2019-11-06 | 70110908002 | 0.240 ppb |