1,4-Dioxane
Horsham Water&sewer Authority
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 | 0.0660 ppb | 32 | 13 | ND - 0.570 ppb |
| 2015 | ND | 2 | 0 | ND |
| 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 |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 | 201406260467AM | 0.120 ppb |
| 2014-06-24 | 201406260370AM | ND |
| 2014-06-24 | 201406260436AM | ND |
| 2014-06-24 | 201406260448AM | 0.570 ppb |
| 2014-06-24 | 201406260452AM | 0.110 ppb |
| 2014-06-24 | 201406260446AM | ND |
| 2014-06-24 | 201406260444AM | ND |
| 2014-06-24 | 201406260469AM | ND |
| 2014-06-25 | 201406270329AM | ND |
| 2014-06-25 | 201406270395AM | ND |
| 2014-06-25 | 201406270399AM | 0.160 ppb |
| 2014-06-25 | 201406270331AM | ND |
| 2014-07-03 | 201407090718AM | ND |
| 2014-07-11 | 201407150382AM | ND |
| 2014-07-11 | 201407150391AM | 0.140 ppb |
| 2014-07-24 | 201407290118AM | 0.0860 ppb |
| 2014-09-24 | 201409270176AM | ND |
| 2014-09-24 | 201409270174AM | 0.120 ppb |
| 2014-12-05 | 201412090618AM | 0.0760 ppb |
| 2014-12-08 | 201412090349AM | ND |
| 2014-12-08 | 201412090620AM | 0.0940 ppb |
| 2014-12-08 | 201412090368AM | ND |
| 2014-12-09 | 201412120375AM | ND |
| 2014-12-09 | 201412120387AM | 0.0850 ppb |
| 2014-12-09 | 201412120378AM | 0.160 ppb |
| 2014-12-10 | 201412120275AM | 0.150 ppb |
| 2014-12-10 | 201412120280AM | ND |
| 2014-12-10 | 201412120285AM | ND |
| 2014-12-12 | 201412160291AM | ND |
| 2014-12-12 | 201412160303AM | ND |
| 2014-12-12 | 201412160297AM | ND |
| 2014-12-12 | 201412160287AM | 0.240 ppb |
| 2015-03-19 | 201503210033AM | ND |
| 2015-03-19 | 201503210035AM | ND |