1,4-Dioxane
Huntington Park 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 | 1.32 ppb | 11 | 10 | ND - 3.10 ppb |
| 2015 | 1.57 ppb | 10 | 9 | ND - 3.30 ppb |
| 2016 | 2.73 ppb | 3 | 3 | 2.50 ppb - 2.90 ppb |
| 2017 | 2.58 ppb | 4 | 4 | 2.40 ppb - 2.70 ppb |
| 2018 | 2.78 ppb | 4 | 4 | 2.60 ppb - 3.10 ppb |
| 2019 | 2.50 ppb | 4 | 4 | 2.20 ppb - 2.70 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 |
|---|---|---|
| 2014-01-09 | 9588-004-1055 | 2.60 ppb |
| 2014-04-01 | 9588-004-0948 | 2.60 ppb |
| 2014-07-01 | 9588-004-0958 | 3.10 ppb |
| 2014-08-26 | 4H26084-11A | 2.20 ppb |
| 2014-08-26 | 4H26084-09A | 0.0910 ppb |
| 2014-08-26 | 4H26084-07A | 0.220 ppb |
| 2014-08-26 | 4H26084-01A | 0.130 ppb |
| 2014-08-26 | 4H26084-05A | 0.360 ppb |
| 2014-08-26 | 4H26084-03A | ND |
| 2014-10-07 | 9588-004-1006 | 3.10 ppb |
| 2014-11-04 | 4K04111-01A | 0.130 ppb |
| 2015-01-06 | 9588-004-1015 | 2.80 ppb |
| 2015-02-03 | 5B03091-01A | 0.110 ppb |
| 2015-02-03 | 5B03091-09A | 2.80 ppb |
| 2015-02-03 | 5B03091-05A | 0.300 ppb |
| 2015-02-03 | 5B03091-07A | 0.210 ppb |
| 2015-02-03 | 5B03091-03A | 0.570 ppb |
| 2015-02-24 | 5B24072-01A | ND |
| 2015-04-07 | 9588-004-1040 | 2.80 ppb |
| 2015-07-07 | 9588-004-1053 | 3.30 ppb |
| 2015-10-06 | 9588-004-0930 | 2.80 ppb |
| 2016-01-05 | 9588-004-1118 | 2.90 ppb |
| 2016-04-05 | 9588-004-0000 | 2.50 ppb |
| 2016-07-05 | 9588-004-1030 | 2.80 ppb |
| 2017-03-31 | 9588-004-0904 | 2.70 ppb |
| 2017-04-04 | 9588-004-0932 | 2.40 ppb |
| 2017-07-07 | 9588-004-0955 | 2.60 ppb |
| 2017-10-03 | 9588-004-1000 | 2.60 ppb |
| 2018-01-02 | 9588-004-1008 | 2.70 ppb |
| 2018-04-03 | 9588-004-1000 | 3.10 ppb |
| 2018-07-10 | 9588-004-0950 | 2.60 ppb |
| 2018-12-27 | 9588-004-0911 | 2.70 ppb |
| 2019-01-28 | 9588-004-0935 | 2.70 ppb |
| 2019-04-02 | 9588-004-0924 | 2.50 ppb |
| 2019-07-09 | 9588-004-0940 | 2.20 ppb |
| 2019-10-01 | 9588-004-1000 | 2.60 ppb |