1,4-Dioxane
City of Sacramento Main
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 | 0.0175 ppb | 20 | 2 | ND - 0.190 ppb |
| 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 |
|---|---|---|
| 2014-01-06 | 4A07018-11A | ND |
| 2014-01-06 | 4A07018-01A | ND |
| 2014-01-06 | 4A07018-07A | 0.160 ppb |
| 2014-01-06 | 4A07018-09A | ND |
| 2014-01-06 | 4A07018-13A | ND |
| 2014-01-06 | 4A07018-03A | ND |
| 2014-01-06 | 4A07018-05A | ND |
| 2014-03-19 | A4C0914-01A | ND |
| 2014-04-03 | A4C1425-01A | ND |
| 2014-04-30 | A4D2284-01A | ND |
| 2014-07-01 | A4F1394-46A | ND |
| 2014-07-01 | A4F1394-11A | ND |
| 2014-07-01 | A4F1394-31A | 0.190 ppb |
| 2014-07-01 | A4F1394-26A | ND |
| 2014-07-01 | A4F1397-01A | ND |
| 2014-07-01 | A4F1397-06A | ND |
| 2014-07-01 | A4F1394-41A | ND |
| 2014-07-01 | A4F1394-61A | ND |
| 2014-10-01 | A4I1384-01A | ND |
| 2014-10-01 | A4I1384-06A | ND |