1,4-Dioxane
Roslyn 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 | 0.204 ppb | 11 | 5 | ND - 0.860 ppb |
| 2015 | 0.176 ppb | 7 | 2 | ND - 0.730 ppb |
| 2016 | 0.440 ppb | 4 | 4 | 0.280 ppb - 0.530 ppb |
| 2017 | 0.319 ppb | 7 | 7 | 0.130 ppb - 0.510 ppb |
| 2018 | 0.381 ppb | 11 | 9 | ND - 0.560 ppb |
| 2019 | 0.418 ppb | 4 | 4 | 0.320 ppb - 0.480 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 |
|---|---|---|
| 2014-06-24 | 1406H35-002-POCS | ND |
| 2014-07-08 | 1407446-002 | 0.140 ppb |
| 2014-08-14 | 08010 082014 | 0.860 ppb |
| 2014-08-15 | 02400 082014 | ND |
| 2014-08-18 | 07104 082014 | ND |
| 2014-08-20 | 04265 082014 | ND |
| 2014-08-20 | 07873 082014 | ND |
| 2014-08-25 | 01870 082014 | 0.300 ppb |
| 2014-08-27 | 05852 082014 | ND |
| 2014-11-10 | 1411665-002-POCS | 0.220 ppb |
| 2014-11-21 | 1411E96-002-POCS | 0.720 ppb |
| 2015-02-10 | 07104 022015 | ND |
| 2015-02-10 | 08010 022015 | 0.730 ppb |
| 2015-02-18 | 04265 022015 | ND |
| 2015-02-18 | 05852 022015 | ND |
| 2015-02-23 | 02400 022015 | ND |
| 2015-05-22 | 07873 052015 | ND |
| 2015-05-28 | 1505K32-002-POCS | 0.500 ppb |
| 2016-06-01 | 1606082-001-PRI | 0.430 ppb |
| 2016-07-18 | 1607D67-002 | 0.520 ppb |
| 2016-07-19 | 1607E94-002 | 0.280 ppb |
| 2016-10-25 | 702896002-SOCS | 0.530 ppb |
| 2017-01-04 | 708255002-SOC | 0.390 ppb |
| 2017-04-06 | 7015144002 | 0.510 ppb |
| 2017-04-19 | 7016340004-PRI | 0.200 ppb |
| 2017-04-19 | 7016340004-POC | 0.200 ppb |
| 2017-07-20 | 7024744002-POCS | 0.130 ppb |
| 2017-07-21 | 7024907002-POC | 0.410 ppb |
| 2017-10-12 | 7032735002-POC | 0.390 ppb |
| 2018-01-11 | 7040222002-POC | ND |
| 2018-02-27 | 7043967002-POC | 0.560 ppb |
| 2018-03-08 | 7044819001 | 0.520 ppb |
| 2018-04-05 | 7047399001-POC | 0.540 ppb |
| 2018-05-30 | 7053122001-SEC | 0.500 ppb |
| 2018-05-31 | 7053353002 | 0.260 ppb |
| 2018-07-09 | 7057445002 | ND |
| 2018-07-26 | 7059540002-POC | 0.460 ppb |
| 2018-08-03 | 7060299002-POC | 0.420 ppb |
| 2018-10-17 | 7068227002 | 0.500 ppb |
| 2018-10-25 | 7069045002 | 0.430 ppb |
| 2019-01-08 | 7075818002 | 0.480 ppb |
| 2019-04-11 | 7085552002 | 0.320 ppb |
| 2019-09-25 | 70106263001 | 0.390 ppb |
| 2019-11-13 | 70111657002 | 0.480 ppb |