1,4-Dioxane
Loves Park
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.830 ppb | 10 | 2 | ND - 4.30 ppb |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | 4.67 ppb | 3 | 3 | 4.20 ppb - 5.00 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 |
---|---|---|
2014-03-10 | 774564-10940 | 4.00 ppb |
2014-03-17 | 775945-10985 | ND |
2014-03-17 | 775947-10985 | ND |
2014-03-17 | 775958-10985 | ND |
2014-03-17 | 775956-10985 | ND |
2014-09-15 | 819548-12429 | ND |
2014-09-15 | 819557-12429 | ND |
2014-09-15 | 819555-12429 | ND |
2014-09-15 | 819552-12429 | 4.30 ppb |
2014-09-15 | 819546-12429 | ND |
2019-05-13 | 9053019-01 | 4.20 ppb |
2019-07-15 | 9073379-01 | 5.00 ppb |
2019-10-15 | 9103216-01 | 4.80 ppb |