1,4-Dioxane
Plainview WD
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 | 1.98 ppb | 13 | 13 | 0.180 ppb - 5.80 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 2.45 ppb | 2 | 2 | 2.40 ppb - 2.50 ppb |
| 2019 | 2.22 ppb | 18 | 18 | 0.190 ppb - 11.0 ppb |
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 |
|---|---|---|
| 2014-05-13 | UCMR3 SRN10929 | 4.40 ppb |
| 2014-05-13 | UCMR3 SRN06580 | 0.180 ppb |
| 2014-05-13 | UCMR3 SRN10927 | 0.670 ppb |
| 2014-05-13 | UCMR3 SRN10930 | 3.70 ppb |
| 2014-05-14 | UCMR3 SRN10840 | 0.730 ppb |
| 2014-05-14 | UCMR3 SRN4095A | 0.710 ppb |
| 2014-05-30 | 34294 052014 | 2.20 ppb |
| 2014-11-05 | 96580 112014 | 1.20 ppb |
| 2014-11-05 | 04095 112014 | 0.860 ppb |
| 2014-11-12 | 10840 112014 | 0.690 ppb |
| 2014-11-12 | 10930 112014 | 5.80 ppb |
| 2014-11-12 | 10927 112014 | 0.740 ppb |
| 2014-11-13 | 10929 112014 | 3.80 ppb |
| 2018-03-27 | 701417001 | 2.50 ppb |
| 2018-03-27 | 7014174002 | 2.40 ppb |
| 2019-03-13 | 7082196003 | 0.650 ppb |
| 2019-03-13 | 7082196002 | 3.50 ppb |
| 2019-03-13 | 7082196001 | 1.20 ppb |
| 2019-03-13 | 7082196004 | 4.50 ppb |
| 2019-03-13 | 7082196006 | 0.710 ppb |
| 2019-03-13 | 7082196005 | 11.0 ppb |
| 2019-03-14 | 7082343004 | 0.700 ppb |
| 2019-03-14 | 7082343003 | 2.60 ppb |
| 2019-03-14 | 7082343001 | 0.190 ppb |
| 2019-03-14 | 7082343005 | 0.260 ppb |
| 2019-03-14 | 7082343002 | 0.230 ppb |
| 2019-03-21 | 7083070001 | 0.930 ppb |
| 2019-08-08 | 70100616005 | 0.290 ppb |
| 2019-08-08 | 70100616002 | 4.30 ppb |
| 2019-08-08 | 70100616004 | 0.740 ppb |
| 2019-08-08 | 70100616006 | 4.30 ppb |
| 2019-08-08 | 70100616001 | 2.00 ppb |
| 2019-10-28 | 70109882001 | 1.80 ppb |