1,4-Dioxane
Pomona 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 | 0.211 ppb | 15 | 10 | ND - 0.540 ppb |
| 2014 | 0.112 ppb | 5 | 2 | ND - 0.450 ppb |
| 2015 | 1.56 ppb | 5 | 5 | 0.190 ppb - 2.50 ppb |
| 2016 | 1.70 ppb | 4 | 4 | 1.20 ppb - 2.10 ppb |
| 2017 | 1.60 ppb | 3 | 3 | 1.40 ppb - 1.80 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 |
|---|---|---|
| 2013-05-08 | 201305080584AM | 0.260 ppb |
| 2013-05-08 | 201305080590AM | ND |
| 2013-05-08 | 201305080586AM | 0.460 ppb |
| 2013-05-08 | 201305080594AM | 0.120 ppb |
| 2013-05-08 | 201305080588AM | 0.490 ppb |
| 2013-05-08 | 201305080592AM | ND |
| 2013-08-08 | 201308080474AM | ND |
| 2013-08-08 | 201308080472AM | 0.460 ppb |
| 2013-08-08 | 201308080470AM | 0.130 ppb |
| 2013-10-02 | 201310020264AM | ND |
| 2013-11-05 | 201311050734AM | ND |
| 2013-11-05 | 201311050730AM | 0.540 ppb |
| 2013-11-05 | 201311050728AM | 0.200 ppb |
| 2013-11-05 | 201311050732AM | 0.410 ppb |
| 2013-11-05 | 201311050736AM | 0.0900 ppb |
| 2014-02-04 | 201402040634AM | ND |
| 2014-02-04 | 201402040632AM | 0.450 ppb |
| 2014-02-04 | 201402040630AM | 0.110 ppb |
| 2014-08-28 | 9590-027-0930 | ND |
| 2014-09-16 | 201409170324AM | ND |
| 2015-01-21 | 9590-040-0900 | 1.70 ppb |
| 2015-03-17 | 201503170763AM | 0.190 ppb |
| 2015-04-16 | 9590-040-0810 | 1.30 ppb |
| 2015-07-14 | 9590-040-0835 | 2.50 ppb |
| 2015-10-08 | 9590-040-1256 | 2.10 ppb |
| 2016-01-06 | 9590-040-0830 | 2.10 ppb |
| 2016-04-07 | 9590-040-0822 | 1.20 ppb |
| 2016-07-13 | 9590-040-1025 | 1.70 ppb |
| 2016-10-20 | 9590-040-1145 | 1.80 ppb |
| 2017-01-18 | 9590-040-1133 | 1.80 ppb |
| 2017-04-13 | 9590-040-0900 | 1.60 ppb |
| 2017-07-20 | 9590-040-1431 | 1.40 ppb |