1,4-Dioxane
Ridgewood Water
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 | 0.0368 ppb | 49 | 18 | ND - 0.140 ppb |
| 2015 | 0.115 ppb | 5 | 4 | ND - 0.210 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 |
|---|---|---|
| 2014-06-25 | 201406260460AM | ND |
| 2014-06-25 | 201406260440AM | ND |
| 2014-06-25 | 201406260486AM | 0.0990 ppb |
| 2014-06-25 | 201406260462AM | 0.130 ppb |
| 2014-06-25 | 201406260490AM | 0.0780 ppb |
| 2014-06-25 | 201406260471AM | 0.1000 ppb |
| 2014-06-25 | 201406260450AM | ND |
| 2014-06-25 | 201406260464AM | 0.0700 ppb |
| 2014-06-25 | 201406260430AM | ND |
| 2014-06-25 | 201406260442AM | 0.120 ppb |
| 2014-06-25 | 201406260488AM | ND |
| 2014-06-25 | 201406260368AM | 0.0790 ppb |
| 2014-06-25 | 201406260484AM | 0.110 ppb |
| 2014-06-25 | 201406260454AM | 0.1000 ppb |
| 2014-06-25 | 201406260438AM | ND |
| 2014-06-25 | 201406260482AM | 0.0840 ppb |
| 2014-06-30 | 201407010140AM | ND |
| 2014-06-30 | 201407010155AM | ND |
| 2014-06-30 | 201407010192AM | 0.110 ppb |
| 2014-06-30 | 201407010210AM | ND |
| 2014-06-30 | 201407010212AM | ND |
| 2014-06-30 | 201407010185AM | ND |
| 2014-06-30 | 201407010208AM | ND |
| 2014-06-30 | 201407010200AM | ND |
| 2014-06-30 | 201407010206AM | ND |
| 2014-06-30 | 201407010202AM | ND |
| 2014-08-06 | 201408070359AM | ND |
| 2014-12-15 | 201412160614AM | 0.0980 ppb |
| 2014-12-15 | 201412160731AM | ND |
| 2014-12-15 | 201412160710AM | 0.0870 ppb |
| 2014-12-15 | 201412160712AM | 0.0990 ppb |
| 2014-12-15 | 201412160703AM | ND |
| 2014-12-15 | 201412160366AM | ND |
| 2014-12-15 | 201412160626AM | ND |
| 2014-12-15 | 201412160312AM | 0.110 ppb |
| 2014-12-17 | 201412180364AM | ND |
| 2014-12-17 | 201412180398AM | ND |
| 2014-12-17 | 201412180307AM | 0.0880 ppb |
| 2014-12-17 | 201412180335AM | ND |
| 2014-12-17 | 201412180314AM | ND |
| 2014-12-17 | 201412180430AM | ND |
| 2014-12-17 | 201412180416AM | ND |
| 2014-12-28 | 201412300450AM | ND |
| 2014-12-29 | 201412300394AM | 0.140 ppb |
| 2014-12-29 | 201412300468AM | ND |
| 2014-12-29 | 201412300480AM | ND |
| 2014-12-29 | 201412300488AM | 0.1000 ppb |
| 2014-12-29 | 201412300448AM | ND |
| 2014-12-29 | 201412300485AM | ND |
| 2015-06-04 | 201506050454AM | 0.0870 ppb |
| 2015-06-04 | 201506050442AM | ND |
| 2015-06-04 | 201506050201AM | 0.130 ppb |
| 2015-06-04 | 201506050379AM | 0.150 ppb |
| 2015-09-23 | 201509240493AM | 0.210 ppb |