1,4-Dioxane
City of Bakersfield
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 | 0.0930 ppb | 36 | 10 | ND - 0.800 ppb |
| 2015 | 0.0399 ppb | 38 | 5 | ND - 0.520 ppb |
| 2016 | ND | 1 | 0 | ND |
| 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 |
|---|---|---|
| 2014-01-06 | A3L1553-05A | 0.300 ppb |
| 2014-02-10 | A4A1447-09A | ND |
| 2014-02-11 | A4A1447-01A | 0.800 ppb |
| 2014-02-20 | A4A1452-09A | ND |
| 2014-03-04 | A4B1894-01A | ND |
| 2014-04-25 | A4C1062-01A | ND |
| 2014-06-09 | A4E0751-01A | 0.110 ppb |
| 2014-06-10 | A4E0751-05A | ND |
| 2014-06-16 | A4E0751-09A | 0.180 ppb |
| 2014-07-07 | A4F1981-01A | ND |
| 2014-07-07 | A4F1983-01A | 0.220 ppb |
| 2014-07-09 | A4F1980-01A | ND |
| 2014-07-18 | A4F2507-01A | 0.110 ppb |
| 2014-07-18 | A4F2498-01A | ND |
| 2014-07-21 | A4G0686-01A | ND |
| 2014-08-11 | A4H0106-01A | ND |
| 2014-08-13 | A4G2293-01A | 0.0970 ppb |
| 2014-08-14 | A4H0105-03A | ND |
| 2014-08-15 | A4H0217-01A | ND |
| 2014-08-18 | A4H0216-01A | ND |
| 2014-08-18 | A4H0214-01A | ND |
| 2014-08-22 | A4G2295-01A | 0.210 ppb |
| 2014-08-22 | A4H0215-01A | ND |
| 2014-08-25 | A4H0212-01A | 0.800 ppb |
| 2014-08-26 | A4G2154-01A | ND |
| 2014-09-05 | A4H1747-01A | 0.520 ppb |
| 2014-09-11 | A4H2687-01A | ND |
| 2014-09-12 | A4I0218-01A | ND |
| 2014-09-17 | A4I0214-01A | ND |
| 2014-10-07 | A4I0215-01A | ND |
| 2014-10-13 | A4I2289-01A | ND |
| 2014-10-24 | A4I0216-01A | ND |
| 2014-10-27 | A4H2686-01A | ND |
| 2014-10-27 | A4I0212-01A | ND |
| 2014-12-04 | A4K2144-01A | ND |
| 2014-12-04 | A4K2145-01A | ND |
| 2015-01-05 | A4L2538-01A | ND |
| 2015-01-05 | A4L2537-01A | 0.110 ppb |
| 2015-01-07 | A4L2533-01A | ND |
| 2015-01-20 | A5A0607-01A | ND |
| 2015-01-23 | A4K2142-01A | 0.500 ppb |
| 2015-01-30 | A5A1062-01A | ND |
| 2015-01-30 | A5A1891-01A | 0.0770 ppb |
| 2015-01-30 | A5A1957-01A | ND |
| 2015-01-30 | A5A1956-01A | ND |
| 2015-02-09 | A5A1893-01A | 0.520 ppb |
| 2015-03-16 | 201503180681AM | ND |
| 2015-03-25 | 201503270370AM | 0.310 ppb |
| 2015-04-07 | 201504090605AM | ND |
| 2015-04-07 | 201504090269AM | ND |
| 2015-05-05 | 201505070557AM | ND |
| 2015-05-05 | 201505070402AM | ND |
| 2015-05-05 | 201505070585AM | ND |
| 2015-05-11 | 201505130736AM | ND |
| 2015-06-02 | 201506040458AM | ND |
| 2015-06-02 | 201506040469AM | ND |
| 2015-06-02 | 201506040627AM | ND |
| 2015-07-15 | 201507170441AM | ND |
| 2015-07-15 | 201507170432AM | ND |
| 2015-07-16 | 201507210508AM | ND |
| 2015-07-17 | 201507210400AM | ND |
| 2015-07-27 | 201507290536AM | ND |
| 2015-07-27 | 201507290617AM | ND |
| 2015-08-12 | 201508180529AM | ND |
| 2015-09-11 | 201509170816AM | ND |
| 2015-09-11 | 201509170450AM | ND |
| 2015-09-11 | 201509150392AM | ND |
| 2015-09-11 | 201509150402AM | ND |
| 2015-09-11 | 201509150496AM | ND |
| 2015-09-29 | 201510020483AM | ND |
| 2015-10-05 | 201510090435AM | ND |
| 2015-10-20 | 201510230203AM | ND |
| 2015-11-02 | 201511060312AM | ND |
| 2015-11-06 | 201511100691AM | ND |
| 2016-01-14 | 201601200631AM | ND |