1,4-Dioxane
Maywood Mutual Water Company #2
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 | 1.83 ppb | 4 | 4 | 1.50 ppb - 2.60 ppb |
| 2015 | 1.80 ppb | 4 | 4 | 1.60 ppb - 2.00 ppb |
| 2016 | 1.78 ppb | 4 | 4 | 1.50 ppb - 2.10 ppb |
| 2017 | 1.67 ppb | 3 | 3 | 1.50 ppb - 2.00 ppb |
| 2018 | 3.48 ppb | 4 | 4 | 1.20 ppb - 7.10 ppb |
| 2019 | 3.90 ppb | 4 | 3 | ND - 7.30 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 |
|---|---|---|
| 2014-03-21 | 9588-001-0941 | 1.50 ppb |
| 2014-04-10 | 9588-001-1045 | 1.50 ppb |
| 2014-07-03 | 9588-001-1136 | 1.70 ppb |
| 2014-11-06 | 9588-001-1120 | 2.60 ppb |
| 2015-01-08 | 9588-001-1200 | 1.80 ppb |
| 2015-04-03 | 9588-001-1020 | 1.60 ppb |
| 2015-07-10 | 9588-001-1145 | 1.80 ppb |
| 2015-10-01 | 9588-001-1550 | 2.00 ppb |
| 2016-01-07 | 9588-001-1145 | 1.80 ppb |
| 2016-04-07 | 9588-001-1059 | 2.10 ppb |
| 2016-07-07 | 9588-001-1041 | 1.70 ppb |
| 2016-10-06 | 9588-001-1048 | 1.50 ppb |
| 2017-01-05 | 9588-001-1055 | 2.00 ppb |
| 2017-04-06 | 9588-001-1106 | 1.50 ppb |
| 2017-07-06 | 9588-001-1105 | 1.50 ppb |
| 2018-01-05 | 9588-001-0942 | 4.00 ppb |
| 2018-05-04 | 9588-001-0920 | 1.60 ppb |
| 2018-07-06 | 9588-001-1025 | 7.10 ppb |
| 2018-10-05 | 9588-001-1050 | 1.20 ppb |
| 2019-02-08 | 9588-001-1009 | 7.20 ppb |
| 2019-05-03 | 9588-001-0917 | ND |
| 2019-07-12 | 9588-001-1015 | 1.10 ppb |
| 2019-10-04 | 9588-001-0950 | 7.30 ppb |