1,4-Dioxane
City of Porterville
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 | 0.0684 ppb | 32 | 8 | ND - 0.730 ppb |
| 2014 | 0.0364 ppb | 32 | 7 | ND - 0.400 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2013-09-16 | B3I1567-13 | ND |
| 2013-09-16 | B3I1567-04 | ND |
| 2013-09-16 | B3I1567-10 | 0.0810 ppb |
| 2013-09-16 | B3I1567-07 | ND |
| 2013-09-16 | B3I1567-16 | ND |
| 2013-09-16 | B3I1567-01 | ND |
| 2013-09-17 | B3I1806-28 | ND |
| 2013-09-17 | B3I1806-19 | 0.510 ppb |
| 2013-09-17 | B3I1806-01 | ND |
| 2013-09-17 | B3I1806-25 | 0.120 ppb |
| 2013-09-17 | B3I1806-13 | 0.0780 ppb |
| 2013-09-17 | B3I1806-04 | 0.730 ppb |
| 2013-09-17 | B3I1806-16 | ND |
| 2013-09-17 | B3I1806-22 | ND |
| 2013-09-17 | B3I1806-10 | ND |
| 2013-09-17 | B3I1806-07 | 0.410 ppb |
| 2013-09-18 | B3I1853-16 | 0.140 ppb |
| 2013-09-18 | B3I1853-19 | ND |
| 2013-09-18 | B3I1853-07 | ND |
| 2013-09-18 | B3I1853-22 | ND |
| 2013-09-18 | B3I1853-01 | ND |
| 2013-09-18 | B3I1853-13 | ND |
| 2013-09-18 | B3I1853-10 | ND |
| 2013-09-18 | B3I1853-25 | ND |
| 2013-09-18 | B3I1853-04 | ND |
| 2013-09-19 | B3I1957-13 | ND |
| 2013-09-19 | B3I1957-01 | ND |
| 2013-09-19 | B3I1957-07 | ND |
| 2013-09-19 | B3I1957-04 | ND |
| 2013-09-19 | B3I1957-10 | ND |
| 2013-09-26 | B3I2610-01 | 0.120 ppb |
| 2013-09-26 | B3I2610-04 | ND |
| 2014-03-10 | B4C1040-01 | ND |
| 2014-03-10 | B4C1040-04 | ND |
| 2014-03-10 | B4C1040-10 | ND |
| 2014-03-10 | B4C1040-07 | ND |
| 2014-03-11 | B4C1205-01 | ND |
| 2014-03-11 | B4C1201-10 | 0.400 ppb |
| 2014-03-11 | B4C1205-04 | 0.120 ppb |
| 2014-03-11 | B4C1201-01 | ND |
| 2014-03-11 | B4C1205-07 | ND |
| 2014-03-11 | B4C1201-07 | ND |
| 2014-03-11 | B4C1201-04 | ND |
| 2014-03-12 | B4C1357-04 | ND |
| 2014-03-12 | B4C1357-07 | ND |
| 2014-03-12 | B4C1362-01 | ND |
| 2014-03-12 | B4C1357-01 | 0.140 ppb |
| 2014-03-12 | B4C1357-10 | ND |
| 2014-03-13 | B4C1432-01 | ND |
| 2014-03-13 | B4C1432-07 | ND |
| 2014-03-13 | B4C1432-04 | 0.190 ppb |
| 2014-03-17 | B4C1726-01 | ND |
| 2014-03-17 | B4C1726-11 | 0.0870 ppb |
| 2014-03-17 | B4C1726-08 | ND |
| 2014-03-17 | B4C1726-05 | 0.140 ppb |
| 2014-03-18 | B4C1886-01 | 0.0870 ppb |
| 2014-03-18 | B4C1885-10 | ND |
| 2014-03-18 | B4C1885-01 | ND |
| 2014-03-18 | B4C1885-04 | ND |
| 2014-03-18 | B4C1885-07 | ND |
| 2014-03-20 | B4C2126-12 | ND |
| 2014-03-20 | B4C2126-05 | ND |
| 2014-03-20 | B4C2126-09 | ND |
| 2014-03-20 | B4C2126-01 | ND |