1,4-Dioxane
Cucamonga Valley Water District
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 | 11 | 0 | ND |
| 2014 | ND | 11 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 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 |
|---|---|---|
| 2013-08-08 | B3H0931-13 | ND |
| 2013-08-08 | B3H0929-01 | ND |
| 2013-08-08 | B3H0931-17 | ND |
| 2013-08-08 | B3H0931-01 | ND |
| 2013-08-08 | B3H0931-05 | ND |
| 2013-08-08 | B3H0931-09 | ND |
| 2013-08-15 | B3H1538-01 | ND |
| 2013-08-15 | B3H1538-05 | ND |
| 2013-11-14 | B3K1254-08 | ND |
| 2013-11-14 | B3K1254-03 | ND |
| 2013-12-16 | B3L1447-01 | ND |
| 2014-02-12 | B4B1260-01 | ND |
| 2014-02-12 | B4B1264-04 | ND |
| 2014-02-13 | B4B1377-04 | ND |
| 2014-02-13 | B4B1377-01 | ND |
| 2014-02-13 | B4B1379-01 | ND |
| 2014-02-13 | B4B1377-10 | ND |
| 2014-02-13 | B4B1379-04 | ND |
| 2014-02-13 | B4B1377-07 | ND |
| 2014-05-15 | B4E1494-07 | ND |
| 2014-05-15 | B4E1494-01 | ND |
| 2014-05-15 | B4E1494-04 | ND |
| 2015-02-12 | B5B1253-01 | ND |
| 2015-05-13 | B5E1236-01 | ND |
| 2015-08-13 | B5H1346-01 | ND |
| 2015-11-19 | B5K1958-01 | ND |