1,4-Dioxane
Bellflower Municipal Water System
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 | 2.37 ppb | 3 | 3 | 2.30 ppb - 2.40 ppb |
| 2015 | 2.30 ppb | 3 | 3 | 1.80 ppb - 2.60 ppb |
| 2016 | 2.23 ppb | 4 | 4 | 2.10 ppb - 2.60 ppb |
| 2017 | 2.30 ppb | 4 | 4 | 2.20 ppb - 2.50 ppb |
| 2018 | 2.15 ppb | 4 | 4 | 1.90 ppb - 2.40 ppb |
| 2019 | 2.28 ppb | 4 | 4 | 1.90 ppb - 2.80 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 |
|---|---|---|
| 2014-05-28 | 9588-028-1030 | 2.30 ppb |
| 2014-07-23 | 9588-028-1351 | 2.40 ppb |
| 2014-10-22 | 9588-028-1026 | 2.40 ppb |
| 2015-02-11 | 9588-028-0938 | 2.60 ppb |
| 2015-04-15 | 9588-028-1059 | 2.50 ppb |
| 2015-07-08 | 9588-028-1157 | 1.80 ppb |
| 2016-01-13 | 9588-028-1050 | 2.60 ppb |
| 2016-06-17 | 9588-028-1020 | 2.10 ppb |
| 2016-07-14 | 9588-028-1043 | 2.10 ppb |
| 2016-10-14 | 9588-028-0945 | 2.10 ppb |
| 2017-01-25 | 9588-028-1005 | 2.20 ppb |
| 2017-05-09 | 9588-028-0950 | 2.50 ppb |
| 2017-07-11 | 9588-028-1035 | 2.30 ppb |
| 2017-10-19 | 9588-028-1045 | 2.20 ppb |
| 2018-01-09 | 9588-028-1100 | 2.30 ppb |
| 2018-04-16 | 9588-028-0920 | 1.90 ppb |
| 2018-07-26 | 9588-028-1050 | 2.40 ppb |
| 2018-10-29 | 9588-028-1025 | 2.00 ppb |
| 2019-01-16 | 9588-028-1120 | 2.80 ppb |
| 2019-04-16 | 9588-028-0915 | 1.90 ppb |
| 2019-09-16 | 9588-028-0935 | 2.10 ppb |
| 2019-11-14 | 9588-028-1005 | 2.30 ppb |