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 |
|---|---|---|---|---|
| 2018 | 2.15 ppb | 4 | 4 | 1.90 ppb - 2.40 ppb |
| 2019 | 2.28 ppb | 4 | 4 | 1.90 ppb - 2.80 ppb |
| 2020 | 2.33 ppb | 4 | 4 | 2.20 ppb - 2.50 ppb |
| 2021 | 2.00 ppb | 4 | 4 | 1.80 ppb - 2.20 ppb |
| 2022 | 2.23 ppb | 4 | 4 | 2.00 ppb - 2.40 ppb |
| 2023 | 1.80 ppb | 4 | 4 | 1.60 ppb - 2.00 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-01-09 | CA1910018_028_028-201801091100 | 2.30 ppb |
| 2018-04-16 | CA1910018_028_028-201804160920 | 1.90 ppb |
| 2018-07-26 | CA1910018_028_028-201807261050 | 2.40 ppb |
| 2018-10-29 | CA1910018_028_028-201810291025 | 2.00 ppb |
| 2019-01-16 | CA1910018_028_028-201901161120 | 2.80 ppb |
| 2019-04-16 | CA1910018_028_028-201904160915 | 1.90 ppb |
| 2019-09-16 | CA1910018_028_028-201909160935 | 2.10 ppb |
| 2019-11-14 | CA1910018_028_028-201911141005 | 2.30 ppb |
| 2020-01-30 | CA1910018_028_028-202001301014 | 2.20 ppb |
| 2020-05-27 | CA1910018_028_028-202005271004 | 2.30 ppb |
| 2020-07-30 | CA1910018_028_028-202007301002 | 2.50 ppb |
| 2020-11-19 | CA1910018_028_028-202011190916 | 2.30 ppb |
| 2021-01-25 | CA1910018_028_028-202101251007 | 2.10 ppb |
| 2021-04-19 | CA1910018_028_028-202104190938 | 1.90 ppb |
| 2021-07-28 | CA1910018_028_028-202107280916 | 1.80 ppb |
| 2021-10-27 | CA1910018_028_028-202110270930 | 2.20 ppb |
| 2022-01-26 | CA1910018_028_028-202201260937 | 2.40 ppb |
| 2022-04-25 | CA1910018_028_028-202204251045 | 2.00 ppb |
| 2022-07-25 | CA1910018_028_028-202207251050 | 2.30 ppb |
| 2022-10-17 | CA1910018_028_028-202210171044 | 2.20 ppb |
| 2023-01-26 | CA1910018_028_028-202301260904 | 1.80 ppb |
| 2023-04-17 | CA1910018_028_028-202304170940 | 2.00 ppb |
| 2023-07-24 | CA1910018_028_028-202307240944 | 1.60 ppb |
| 2023-10-17 | CA1910018_028_028-202310170908 | 1.80 ppb |