1,4-Dioxane
Hempstead
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 | 2.13 ppb | 4 | 2 | ND - 4.50 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 | N/A | 0 | 0 | N/A |
| 2019 | 4.75 ppb | 16 | 16 | 0.0460 ppb - 10.5 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 |
|---|---|---|
| 2013-06-18 | 91027 CLINTON ST | 4.50 ppb |
| 2013-06-18 | 91028 | ND |
| 2013-12-25 | 91027 | 4.00 ppb |
| 2013-12-25 | 91028 IF0709 | ND |
| 2019-01-23 | 7077380004 | 0.0460 ppb |
| 2019-01-23 | 7077380005 | 6.30 ppb |
| 2019-01-23 | 7077380003 | 0.170 ppb |
| 2019-01-23 | 7077380001 | 9.60 ppb |
| 2019-01-23 | 70777380002 | 2.80 ppb |
| 2019-01-29 | 7077827002-PRI | 4.10 ppb |
| 2019-01-29 | 7077827001-PRI | 7.80 ppb |
| 2019-02-05 | 7078466002 | 10.5 ppb |
| 2019-02-05 | 7078466001 | 6.90 ppb |
| 2019-11-08 | EHS1900056176-SR | 3.27 ppb |
| 2019-11-08 | EHS1900056177-SR | 4.50 ppb |
| 2019-11-08 | EHS1900056171-SR | 6.67 ppb |
| 2019-11-08 | EHS1900056174-SR | 2.49 ppb |
| 2019-11-08 | EHS1900056172-SR | 5.37 ppb |
| 2019-11-08 | EHS1900056178-SR | 4.93 ppb |
| 2019-11-08 | EHS1900056175-SR | 0.578 ppb |