1,4-Dioxane
Collingswood Water Depar
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 | 1.78 ppb | 4 | 4 | 1.20 ppb - 2.40 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 1.81 ppb | 18 | 18 | 1.31 ppb - 2.87 ppb |
| 2017 | 1.93 ppb | 17 | 17 | 0.900 ppb - 3.46 ppb |
| 2018 | 2.07 ppb | 17 | 17 | 0.550 ppb - 3.28 ppb |
| 2019 | 1.30 ppb | 2 | 2 | 1.20 ppb - 1.40 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 |
|---|---|---|
| 2014-03-28 | 1078865006 | 2.40 ppb |
| 2014-03-28 | 1078865003 | 1.40 ppb |
| 2014-09-26 | 2031570003 | 1.20 ppb |
| 2014-09-26 | 2031570006 | 2.10 ppb |
| 2016-06-07 | 32894007 | 1.31 ppb |
| 2016-06-07 | 32894005 | 1.66 ppb |
| 2016-06-07 | 32894008 | 2.32 ppb |
| 2016-06-07 | 32894002 | 2.76 ppb |
| 2016-06-07 | 32894001 | 1.39 ppb |
| 2016-06-07 | 32894006 | 1.41 ppb |
| 2016-09-13 | 33626606 | 2.82 ppb |
| 2016-09-13 | 33626603 | 1.31 ppb |
| 2016-09-13 | 33626602 | 2.87 ppb |
| 2016-09-13 | 33626605 | 1.78 ppb |
| 2016-09-13 | 33626601 | 1.42 ppb |
| 2016-09-13 | 33626604 | 1.45 ppb |
| 2016-12-13 | 34396703 | 1.56 ppb |
| 2016-12-13 | 34396702 | 1.39 ppb |
| 2016-12-13 | 34396701 | 1.37 ppb |
| 2016-12-13 | 34396705 | 1.54 ppb |
| 2016-12-13 | 34396706 | 2.62 ppb |
| 2016-12-13 | 34396704 | 1.57 ppb |
| 2017-03-13 | 35447601 | 1.83 ppb |
| 2017-03-13 | 35448001 | 1.21 ppb |
| 2017-03-13 | 35447701 | 1.32 ppb |
| 2017-03-13 | 35448101 | 0.900 ppb |
| 2017-03-13 | 35447901 | 1.12 ppb |
| 2017-03-13 | 35447501 | 1.40 ppb |
| 2017-09-25 | 37705606 | 3.12 ppb |
| 2017-09-25 | 37705604 | 1.59 ppb |
| 2017-09-25 | 37705601 | 1.63 ppb |
| 2017-09-25 | 37705602 | 1.64 ppb |
| 2017-09-25 | 37705605 | 2.98 ppb |
| 2017-09-25 | 37705603 | 1.94 ppb |
| 2017-12-26 | 38668205 | 3.46 ppb |
| 2017-12-26 | 38668201 | 1.84 ppb |
| 2017-12-26 | 38668204 | 3.44 ppb |
| 2017-12-26 | 38668203 | 1.76 ppb |
| 2017-12-26 | 38668202 | 1.68 ppb |
| 2018-03-16 | 39510804 | 2.98 ppb |
| 2018-03-16 | 39510803 | 1.50 ppb |
| 2018-03-16 | 39510801 | 1.29 ppb |
| 2018-03-16 | 39510805 | 3.10 ppb |
| 2018-03-16 | 39510802 | 1.59 ppb |
| 2018-06-26 | 40707502 | 2.64 ppb |
| 2018-06-26 | 40707501 | 1.97 ppb |
| 2018-06-26 | 40707505 | 3.27 ppb |
| 2018-06-26 | 40707504 | 1.73 ppb |
| 2018-06-26 | 40707503 | 2.50 ppb |
| 2018-06-27 | 40707506 | 0.550 ppb |
| 2018-09-20 | 41942802 | 1.40 ppb |
| 2018-09-20 | 41942805 | 2.53 ppb |
| 2018-09-20 | 41942804 | 1.41 ppb |
| 2018-09-20 | 41942803 | 1.79 ppb |
| 2018-09-20 | 41942806 | 3.28 ppb |
| 2018-09-20 | 41942801 | 1.68 ppb |
| 2019-07-10 | 3045293001 | 1.20 ppb |
| 2019-10-16 | 3064863001 | 1.40 ppb |