1,4-Dioxane
Maywood Mutual Water Company #1
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 | 2.73 ppb | 4 | 4 | 2.40 ppb - 3.50 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 4.30 ppb | 1 | 1 | 4.30 ppb |
| 2017 | 2.30 ppb | 4 | 4 | 1.80 ppb - 3.60 ppb |
| 2018 | 2.91 ppb | 7 | 7 | 2.20 ppb - 3.90 ppb |
| 2019 | 3.23 ppb | 8 | 8 | 2.30 ppb - 4.60 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 |
|---|---|---|
| 2014-06-25 | 9588-003-0905 | 3.50 ppb |
| 2014-07-07 | 9588-003-0837 | 2.40 ppb |
| 2014-07-17 | 9588-003-1045 | 2.50 ppb |
| 2014-12-11 | 9588-003-1023 | 2.50 ppb |
| 2016-02-05 | 9588-003-0955 | 4.30 ppb |
| 2017-01-20 | 9588-003-1230 | 3.60 ppb |
| 2017-06-01 | 9588-002-0904 | 1.80 ppb |
| 2017-09-27 | 9588-002-0905 | 1.90 ppb |
| 2017-10-23 | 9588-002-0915 | 1.90 ppb |
| 2018-01-11 | 9588-002-1100 | 2.20 ppb |
| 2018-04-23 | 9588-002-0920 | 2.20 ppb |
| 2018-06-29 | 9588-003-0905 | 3.60 ppb |
| 2018-07-23 | 9588-002-0945 | 2.30 ppb |
| 2018-07-23 | 9588-003-0924 | 3.80 ppb |
| 2018-10-22 | 9588-003-0905 | 3.90 ppb |
| 2018-10-22 | 9588-002-0928 | 2.40 ppb |
| 2019-01-17 | 9588-003-0915 | 4.60 ppb |
| 2019-01-17 | 9588-002-0943 | 2.90 ppb |
| 2019-04-26 | 9588-003-0920 | 3.60 ppb |
| 2019-04-26 | 9588-002-1000 | 2.40 ppb |
| 2019-07-15 | 9588-003-0920 | 3.50 ppb |
| 2019-07-15 | 9588-002-0000 | 2.30 ppb |
| 2019-10-15 | 9588-003-0910 | 4.00 ppb |
| 2019-10-15 | 9588-002-0935 | 2.50 ppb |