1,4-Dioxane
Rancho California Water District
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 | ND | 34 | 0 | ND |
| 2015 | ND | 42 | 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 |
|---|---|---|
| 2014-10-06 | B4J0481-01 | ND |
| 2014-10-07 | B4J0640-13 | ND |
| 2014-10-07 | B4J0640-10 | ND |
| 2014-10-07 | B4J0640-04 | ND |
| 2014-10-07 | B4J0640-01 | ND |
| 2014-10-07 | B4J0640-07 | ND |
| 2014-10-08 | B4J0845-13 | ND |
| 2014-10-08 | B4J0845-16 | ND |
| 2014-10-08 | B4J0845-04 | ND |
| 2014-10-08 | B4J0845-07 | ND |
| 2014-10-08 | B4J0845-01 | ND |
| 2014-10-08 | B4J0845-10 | ND |
| 2014-10-08 | B4J0845-19 | ND |
| 2014-10-09 | B4J1091-05 | ND |
| 2014-10-09 | B4J1091-11 | ND |
| 2014-10-09 | B4J1091-08 | ND |
| 2014-10-09 | B4J1091-14 | ND |
| 2014-10-13 | B4J1329-13 | ND |
| 2014-10-13 | B4J1329-19 | ND |
| 2014-10-13 | B4J1329-04 | ND |
| 2014-10-13 | B4J1329-22 | ND |
| 2014-10-13 | B4J1329-25 | ND |
| 2014-10-13 | B4J1329-01 | ND |
| 2014-10-13 | B4J1329-16 | ND |
| 2014-10-13 | B4J1329-07 | ND |
| 2014-10-13 | B4J1329-10 | ND |
| 2014-10-14 | B4J1493-07 | ND |
| 2014-10-14 | B4J1493-13 | ND |
| 2014-10-14 | B4J1493-10 | ND |
| 2014-10-14 | B4J1493-01 | ND |
| 2014-10-14 | B4J1493-04 | ND |
| 2014-10-15 | B4J1671-01 | ND |
| 2014-11-04 | B4K0339-01 | ND |
| 2014-11-14 | B4K1419-01 | ND |
| 2015-01-15 | B5A1539-01 | ND |
| 2015-02-03 | B5B0305-01 | ND |
| 2015-03-30 | B5C2852-04 | ND |
| 2015-03-30 | B5C2852-01 | ND |
| 2015-04-02 | B5D0198-04 | ND |
| 2015-04-02 | B5D0198-01 | ND |
| 2015-04-13 | B5D1204-01 | ND |
| 2015-04-13 | B5D1204-22 | ND |
| 2015-04-13 | B5D1204-16 | ND |
| 2015-04-13 | B5D1204-10 | ND |
| 2015-04-13 | B5D1204-04 | ND |
| 2015-04-13 | B5D1204-19 | ND |
| 2015-04-13 | B5D1204-13 | ND |
| 2015-04-13 | B5D1204-07 | ND |
| 2015-04-14 | B5D1346-04 | ND |
| 2015-04-14 | B5D1346-01 | ND |
| 2015-04-15 | B5D1533-28 | ND |
| 2015-04-15 | B5D1533-16 | ND |
| 2015-04-15 | B5D1533-31 | ND |
| 2015-04-15 | B5D1533-01 | ND |
| 2015-04-15 | B5D1533-10 | ND |
| 2015-04-15 | B5D1533-13 | ND |
| 2015-04-15 | B5D1533-19 | ND |
| 2015-04-15 | B5D1533-25 | ND |
| 2015-04-15 | B5D1533-22 | ND |
| 2015-04-15 | B5D1533-04 | ND |
| 2015-04-15 | B5D1533-34 | ND |
| 2015-04-15 | B5D1533-07 | ND |
| 2015-04-16 | B5D1685-16 | ND |
| 2015-04-16 | B5D1685-07 | ND |
| 2015-04-16 | B5D1685-13 | ND |
| 2015-04-16 | B5D1685-10 | ND |
| 2015-04-16 | B5D1685-01 | ND |
| 2015-04-16 | B5D1685-04 | ND |
| 2015-04-22 | B5D2227-04 | ND |
| 2015-04-22 | B5D2227-01 | ND |
| 2015-04-29 | B5D2887-04 | ND |
| 2015-04-29 | B5D2887-01 | ND |
| 2015-07-21 | B5G2279-04 | ND |
| 2015-07-21 | B5G2279-01 | ND |
| 2015-08-20 | B5H2092-01 | ND |
| 2015-08-20 | B5H2092-04 | ND |