1,4-Dioxane
City of Tulare
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 | 0.00537 ppb | 54 | 2 | ND - 0.190 ppb |
| 2015 | ND | 1 | 0 | ND |
| 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 |
|---|---|---|
| 2014-01-22 | A4A0159-09A | ND |
| 2014-01-22 | A4A0159-05A | ND |
| 2014-01-22 | A4A0173-09A | ND |
| 2014-01-22 | A4A0173-01A | ND |
| 2014-01-22 | A4A0167-09A | ND |
| 2014-01-22 | A4A0167-05A | ND |
| 2014-01-22 | A4A0173-05A | ND |
| 2014-01-22 | A4A0167-01A | ND |
| 2014-01-22 | A4A0159-01A | ND |
| 2014-01-23 | A4A0152-09A | ND |
| 2014-01-23 | A4A0152-05A | ND |
| 2014-01-23 | A4A0174-05A | ND |
| 2014-01-23 | A4A0171-01A | ND |
| 2014-01-23 | A4A0171-05A | 0.190 ppb |
| 2014-01-23 | A4A0152-01A | ND |
| 2014-01-23 | A4A0174-01A | ND |
| 2014-01-23 | A4A0174-09A | ND |
| 2014-01-23 | A4A0174-13A | ND |
| 2014-01-23 | A4A0171-09A | ND |
| 2014-01-24 | A4A0175-01A | ND |
| 2014-01-24 | A4A0161-05A | ND |
| 2014-01-24 | A4A0175-05A | ND |
| 2014-01-24 | A4A0161-01A | ND |
| 2014-01-24 | A4A0175-09A | ND |
| 2014-01-24 | A4A0175-13A | ND |
| 2014-01-24 | A4A0172-01A | ND |
| 2014-01-24 | A4A0172-05A | ND |
| 2014-07-15 | A4G0617-06A | ND |
| 2014-07-15 | A4G0620-11A | ND |
| 2014-07-15 | A4G0620-01A | ND |
| 2014-07-15 | A4G0608-06A | ND |
| 2014-07-15 | A4G0608-11A | ND |
| 2014-07-15 | A4G0617-01A | ND |
| 2014-07-15 | A4G0620-06A | ND |
| 2014-07-15 | A4G0617-11A | ND |
| 2014-07-15 | A4G0608-01A | ND |
| 2014-07-16 | A4G1343-11A | ND |
| 2014-07-16 | A4G1349-01A | ND |
| 2014-07-16 | A4G1353-01A | ND |
| 2014-07-16 | A4G1353-06A | ND |
| 2014-07-16 | A4G1349-06A | 0.1000 ppb |
| 2014-07-16 | A4G1343-01A | ND |
| 2014-07-16 | A4G1353-11A | ND |
| 2014-07-16 | A4G1353-16A | ND |
| 2014-07-17 | A4G1382-01A | ND |
| 2014-07-17 | A4G1363-01A | ND |
| 2014-07-17 | A4G1343-06A | ND |
| 2014-07-17 | A4G1388-06A | ND |
| 2014-07-17 | A4G1382-11A | ND |
| 2014-07-17 | A4G1388-01A | ND |
| 2014-07-17 | A4G1363-06A | ND |
| 2014-07-17 | A4G1388-16A | ND |
| 2014-07-17 | A4G1382-06A | ND |
| 2014-07-17 | A4G1388-11A | ND |
| 2015-11-30 | A5K0996-01A | ND |