1,4-Dioxane
Montebello-city, Water Department
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 | N/A | 0 | 0 | N/A |
| 2015 | 0.600 ppb | 2 | 1 | ND - 1.20 ppb |
| 2016 | 0.300 ppb | 4 | 1 | ND - 1.20 ppb |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
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 |
|---|---|---|
| 2015-04-28 | 9588-004-1145 | ND |
| 2015-07-24 | 9588-004-1120 | 1.20 ppb |
| 2016-01-26 | 9588-004-1001 | ND |
| 2016-04-27 | 9588-004-1115 | 1.20 ppb |
| 2016-07-29 | 9588-004-0905 | ND |
| 2016-10-18 | 9588-004-0952 | ND |
| 2017-01-27 | 9588-004-1050 | ND |
| 2017-04-28 | 9588-004-1215 | ND |
| 2017-07-25 | 9588-004-1040 | ND |
| 2017-10-23 | 9588-004-0940 | ND |
| 2018-01-10 | 9588-004-1100 | ND |
| 2018-04-18 | 9588-004-1001 | ND |
| 2018-07-10 | 9588-004-0810 | ND |
| 2018-10-10 | 9588-004-0930 | ND |
| 2019-01-15 | 9588-004-1331 | ND |
| 2019-04-09 | 9588-004-0846 | ND |
| 2019-07-16 | 9588-004-1000 | ND |
| 2019-10-08 | 9588-004-1022 | ND |