1,4-Dioxane
Pico Rivera 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 |
|---|---|---|---|---|
| 2013 | 0.704 ppb | 12 | 12 | 0.200 ppb - 2.70 ppb |
| 2014 | 1.01 ppb | 11 | 11 | 0.420 ppb - 2.40 ppb |
| 2015 | 1.85 ppb | 4 | 4 | 1.80 ppb - 2.00 ppb |
| 2016 | 1.65 ppb | 4 | 4 | 1.60 ppb - 1.70 ppb |
| 2017 | 1.40 ppb | 1 | 1 | 1.40 ppb |
| 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 |
|---|---|---|
| 2013-01-24 | 440-36162-5 | 0.260 ppb |
| 2013-01-24 | 440-36162-3 | 0.200 ppb |
| 2013-01-24 | 440-36162-9 | 0.350 ppb |
| 2013-01-24 | 440-36162-7 | 0.460 ppb |
| 2013-01-24 | 440-36162-11 | 0.450 ppb |
| 2013-01-24 | 440-36162-1 | 1.80 ppb |
| 2013-07-30 | 2868984 | 0.590 ppb |
| 2013-07-30 | 2869011 | 0.490 ppb |
| 2013-07-30 | 2869020 | 0.210 ppb |
| 2013-07-30 | 2868993 | 0.480 ppb |
| 2013-07-30 | 2869002 | 0.460 ppb |
| 2013-07-30 | 2869032 | 2.70 ppb |
| 2014-01-30 | 9588-012-1020 | 1.80 ppb |
| 2014-01-31 | 4A31062-01A | 0.500 ppb |
| 2014-04-24 | 9588-012-1029 | 2.40 ppb |
| 2014-06-04 | 4F04050-01A | 0.490 ppb |
| 2014-06-19 | 4F19089-01A | 0.640 ppb |
| 2014-07-30 | 4G30066-01A | 0.980 ppb |
| 2014-07-30 | 4G30066-03A | 0.540 ppb |
| 2014-12-17 | 4L17087-05A | 0.640 ppb |
| 2014-12-17 | 4L17087-03A | 0.420 ppb |
| 2014-12-17 | 4L17087-01A | 0.960 ppb |
| 2014-12-18 | 9588-012-1050 | 1.70 ppb |
| 2015-03-05 | 9588-012-0906 | 1.80 ppb |
| 2015-04-29 | 9588-012-0940 | 1.80 ppb |
| 2015-07-28 | 9588-012-1109 | 2.00 ppb |
| 2015-10-14 | 9588-012-1033 | 1.80 ppb |
| 2016-03-24 | 9588-012-0940 | 1.70 ppb |
| 2016-05-09 | 9588-012-1115 | 1.60 ppb |
| 2016-07-21 | 9588-012-1105 | 1.70 ppb |
| 2016-11-09 | 9588-012-0943 | 1.60 ppb |
| 2017-02-09 | 9588-012-0945 | 1.40 ppb |