1,4-Dioxane
Maywood Mutual Water Company #3
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 | 4.20 ppb | 4 | 4 | 3.20 ppb - 4.90 ppb |
| 2015 | 4.35 ppb | 4 | 4 | 3.20 ppb - 4.90 ppb |
| 2016 | 3.88 ppb | 4 | 4 | 2.70 ppb - 4.70 ppb |
| 2017 | 3.02 ppb | 5 | 4 | ND - 4.40 ppb |
| 2018 | 3.65 ppb | 4 | 4 | 2.90 ppb - 4.30 ppb |
| 2019 | 3.83 ppb | 4 | 4 | 3.50 ppb - 4.40 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 |
|---|---|---|
| 2014-01-24 | 9588-009-1340 | 3.20 ppb |
| 2014-04-22 | 9588-009-0930 | 4.80 ppb |
| 2014-07-17 | 9588-009-0955 | 4.90 ppb |
| 2014-11-25 | 9588-009-1445 | 3.90 ppb |
| 2015-01-27 | 9588-009-0930 | 4.80 ppb |
| 2015-04-07 | 9588-009-1200 | 4.50 ppb |
| 2015-07-28 | 9588-009-1000 | 4.90 ppb |
| 2015-10-27 | 9588-009-0933 | 3.20 ppb |
| 2016-03-23 | 9588-009-1027 | 4.20 ppb |
| 2016-05-04 | 9588-009-0952 | 3.90 ppb |
| 2016-08-16 | 9588-009-0935 | 4.70 ppb |
| 2016-10-11 | 9588-009-1046 | 2.70 ppb |
| 2017-01-13 | 9588-009-0955 | 4.00 ppb |
| 2017-04-05 | 9588-004-0930 | ND |
| 2017-04-05 | 9588-009-0955 | 3.70 ppb |
| 2017-07-11 | 9588-009-0905 | 3.00 ppb |
| 2017-10-12 | 9588-009-0950 | 4.40 ppb |
| 2018-01-25 | 9588-009-0945 | 2.90 ppb |
| 2018-04-10 | 9588-009-0930 | 4.30 ppb |
| 2018-07-27 | 9588-009-0954 | 3.70 ppb |
| 2018-10-30 | 9588-009-0850 | 3.70 ppb |
| 2019-01-29 | 9588-009-0940 | 4.40 ppb |
| 2019-05-03 | 9588-009-0857 | 3.80 ppb |
| 2019-07-16 | 9588-009-1005 | 3.60 ppb |
| 2019-10-29 | 9588-009-1030 | 3.50 ppb |