1,4-Dioxane
Parsippany-Troy Hills Water Department
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 | 0.0936 ppb | 14 | 6 | ND - 0.460 ppb |
| 2015 | 0.118 ppb | 14 | 10 | ND - 0.380 ppb |
| 2016 | 0.370 ppb | 2 | 2 | 0.360 ppb - 0.380 ppb |
| 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 |
|---|---|---|
| 2014-08-18 | 201408200303AM | 0.150 ppb |
| 2014-08-18 | 201408210510AM | ND |
| 2014-08-18 | 201408200343AM | ND |
| 2014-08-18 | 201408210301AM | 0.1000 ppb |
| 2014-08-18 | 201408200322AM | ND |
| 2014-08-18 | 201408200330AM | ND |
| 2014-08-18 | 201408210478AM | 0.240 ppb |
| 2014-08-18 | 201408200284AM | 0.240 ppb |
| 2014-08-18 | 201408210412AM | 0.460 ppb |
| 2014-08-19 | 201408210311AM | ND |
| 2014-08-19 | 201408210225AM | ND |
| 2014-08-19 | 201408210474AM | 0.120 ppb |
| 2014-08-19 | 201408210498AM | ND |
| 2014-11-12 | 201411150203AM | ND |
| 2015-02-18 | 201502200289AM | 0.320 ppb |
| 2015-02-18 | 201502200373AM | 0.210 ppb |
| 2015-02-23 | 201502270176AM | 0.380 ppb |
| 2015-02-23 | 201502270197AM | ND |
| 2015-02-23 | 201502270159AM | 0.1000 ppb |
| 2015-02-23 | 201502270146AM | 0.0810 ppb |
| 2015-02-23 | 201502270168AM | ND |
| 2015-02-24 | 201502270135AM | 0.0960 ppb |
| 2015-02-24 | 201502270154AM | 0.170 ppb |
| 2015-02-24 | 201502270165AM | ND |
| 2015-02-24 | 201502270247AM | 0.120 ppb |
| 2015-02-25 | 201502270195AM | 0.0890 ppb |
| 2015-02-25 | 201502270162AM | 0.0920 ppb |
| 2015-05-06 | 201505080282AM | ND |
| 2016-09-13 | 201608290094 | 0.360 ppb |
| 2016-11-29 | 201612010366 | 0.380 ppb |