1,4-Dioxane
City of Morgan Hill
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 |
|---|---|---|---|---|
| 2013 | ND | 15 | 0 | ND |
| 2014 | ND | 14 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2013-09-04 | A3H1842-01A | ND |
| 2013-09-04 | A3H1842-10A | ND |
| 2013-09-04 | A3H1842-06A | ND |
| 2013-09-09 | A3H1863-14A | ND |
| 2013-09-09 | A3H1863-10A | ND |
| 2013-09-09 | A3H1863-06A | ND |
| 2013-09-09 | A3H1863-01A | ND |
| 2013-09-23 | A3H2437-06A | ND |
| 2013-09-23 | A3H2437-01A | ND |
| 2013-09-23 | A3H2437-10A | ND |
| 2013-09-23 | A3H2437-14A | ND |
| 2013-09-30 | A3H1989-14A | ND |
| 2013-09-30 | A3H1989-06A | ND |
| 2013-09-30 | A3H1989-01A | ND |
| 2013-09-30 | A3H1989-10A | ND |
| 2014-03-03 | A4B1492-06A | ND |
| 2014-03-10 | A4B1500-06A | ND |
| 2014-03-10 | A4B1500-01A | ND |
| 2014-03-10 | A4B1500-10A | ND |
| 2014-03-10 | A4B1500-14A | ND |
| 2014-03-17 | A4B1509-01A | ND |
| 2014-03-17 | A4B1509-10A | ND |
| 2014-03-17 | A4B1509-06A | ND |
| 2014-03-17 | A4B1509-14A | ND |
| 2014-03-24 | A4B1510-06A | ND |
| 2014-03-24 | A4B1510-10A | ND |
| 2014-03-24 | A4B1510-14A | ND |
| 2014-03-24 | A4B1510-01A | ND |
| 2014-06-30 | A4F1444-01A | ND |