1,4-Dioxane
Iredell Water Corporation
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 | 0.00438 ppb | 16 | 1 | ND - 0.0700 ppb |
| 2014 | 0.0358 ppb | 24 | 7 | ND - 0.210 ppb |
| 2015 | 0.0101 ppb | 23 | 3 | ND - 0.0800 ppb |
| 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 |
|---|---|---|
| 2013-04-23 | 201304250510AM | ND |
| 2013-04-23 | 201304250512AM | ND |
| 2013-04-23 | 201304250427AM | ND |
| 2013-04-23 | 201304250497AM | ND |
| 2013-04-23 | 201304250464AM | ND |
| 2013-04-23 | 201304250500AM | ND |
| 2013-04-23 | 201304250466AM | ND |
| 2013-04-23 | 201304250457AM | ND |
| 2013-10-21 | 201310220234AM | ND |
| 2013-10-21 | 201310220149AM | ND |
| 2013-10-21 | 201310220072AM | ND |
| 2013-10-21 | 201310220063AM | 0.0700 ppb |
| 2013-10-21 | 201310220238AM | ND |
| 2013-10-21 | 201310220199AM | ND |
| 2013-10-21 | 201310220213AM | ND |
| 2013-10-21 | 201310220221AM | ND |
| 2014-04-28 | 201404290278AM | ND |
| 2014-04-28 | 201404290268AM | ND |
| 2014-04-28 | 201404290227AM | 0.140 ppb |
| 2014-04-28 | 201404300415AM | ND |
| 2014-04-28 | 201404290222AM | ND |
| 2014-04-28 | 201404290284AM | ND |
| 2014-04-28 | 201404290270AM | ND |
| 2014-04-28 | 201404290263AM | ND |
| 2014-04-28 | 201404290241AM | 0.0740 ppb |
| 2014-04-28 | 201404290225AM | ND |
| 2014-04-28 | 201404290292AM | 0.110 ppb |
| 2014-04-28 | 201404290276AM | ND |
| 2014-10-28 | 201410290495AM | ND |
| 2014-10-28 | 201410290450AM | ND |
| 2014-10-28 | 201410290539AM | 0.0850 ppb |
| 2014-10-28 | 201410290517AM | ND |
| 2014-10-28 | 201410290436AM | ND |
| 2014-10-28 | 201410290549AM | ND |
| 2014-10-28 | 201410290528AM | ND |
| 2014-10-28 | 201410290493AM | 0.110 ppb |
| 2014-10-28 | 201410290397AM | ND |
| 2014-10-28 | 201410290474AM | 0.130 ppb |
| 2014-10-28 | 201410290452AM | 0.210 ppb |
| 2014-10-28 | 201410290417AM | ND |
| 2015-04-13 | 201504140759AM | ND |
| 2015-04-13 | 201504140775AM | ND |
| 2015-04-13 | 201504140625AM | ND |
| 2015-04-13 | 201504140610AM | ND |
| 2015-04-13 | 201504140693AM | ND |
| 2015-04-13 | 201504140689AM | ND |
| 2015-04-14 | 201504150443AM | ND |
| 2015-04-14 | 201504150541AM | 0.0720 ppb |
| 2015-04-14 | 201504150407AM | ND |
| 2015-04-14 | 201504150526AM | 0.0800 ppb |
| 2015-04-14 | 201504150517AM | ND |
| 2015-04-14 | 201504150376AM | ND |
| 2015-10-28 | 201510290392AM | ND |
| 2015-10-28 | 201510290342AM | ND |
| 2015-10-28 | 201510290416AM | ND |
| 2015-10-28 | 201510290362AM | ND |
| 2015-10-28 | 201510300260AM | ND |
| 2015-10-28 | 201510300303AM | ND |
| 2015-10-29 | 201510300332AM | ND |
| 2015-10-29 | 201510300309AM | ND |
| 2015-10-29 | 201510300264AM | ND |
| 2015-10-29 | 201510300267AM | 0.0800 ppb |
| 2015-10-29 | 201510300307AM | ND |