1,4-Dioxane
West Hempstead 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 |
|---|---|---|---|---|
| 2013 | 0.135 ppb | 4 | 2 | ND - 0.310 ppb |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 0.238 ppb | 20 | 13 | ND - 1.20 ppb |
| 2019 | 0.128 ppb | 6 | 3 | ND - 0.650 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 |
|---|---|---|
| 2013-02-21 | 90001 EST-BS | ND |
| 2013-02-21 | 90002 EST-7S | 0.310 ppb |
| 2013-08-15 | 90001 (EST-BS) | ND |
| 2013-08-15 | 90002 (EST-7S) | 0.230 ppb |
| 2018-01-29 | 7041549003 | 0.530 ppb |
| 2018-01-29 | 7041549005 | ND |
| 2018-05-22 | 7052421007 | 0.0370 ppb |
| 2018-05-22 | 7052421002 | 1.20 ppb |
| 2018-05-22 | 7052421005 | ND |
| 2018-05-22 | 7052421004 | ND |
| 2018-05-22 | 7052421006 | ND |
| 2018-05-22 | 7074454003 | 0.330 ppb |
| 2018-06-07 | 7054159001 | 0.0920 ppb |
| 2018-09-26 | 7065942003 | 1.20 ppb |
| 2018-09-26 | 7065942002 | 0.0250 ppb |
| 2018-09-26 | 7065942005 | ND |
| 2018-09-26 | 7065942004 | 0.120 ppb |
| 2018-09-26 | 7065942006 | 0.0290 ppb |
| 2018-09-26 | 7065942001 | ND |
| 2018-12-19 | 7074454001 | 0.0330 ppb |
| 2018-12-19 | 7074454002 | ND |
| 2018-12-19 | 7074454005 | 0.0210 ppb |
| 2018-12-19 | 7074454006 | 0.0490 ppb |
| 2018-12-19 | 7074454004 | 1.10 ppb |
| 2019-10-10 | 70108059005 | 0.0920 ppb |
| 2019-10-10 | 70108059006 | 0.650 ppb |
| 2019-10-10 | 70108059002 | ND |
| 2019-10-10 | 70108059007 | ND |
| 2019-10-10 | 70108059004 | ND |
| 2019-10-10 | 70108059003 | 0.0260 ppb |