1,4-Dioxane
New York American Water - Lynbrook
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 | 0.0522 ppb | 37 | 5 | ND - 0.920 ppb |
| 2015 | 0.186 ppb | 5 | 3 | ND - 0.710 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 0.0967 ppb | 27 | 9 | ND - 1.20 ppb |
| 2018 | ND | 2 | 0 | ND |
| 2019 | 0.0785 ppb | 27 | 10 | ND - 1.27 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 |
|---|---|---|
| 2014-05-05 | 25664001 | ND |
| 2014-05-05 | 25666201 | ND |
| 2014-05-06 | 25665601 | 0.420 ppb |
| 2014-05-07 | 25664401 | ND |
| 2014-05-07 | 25666101 | ND |
| 2014-05-12 | 25665201 | ND |
| 2014-05-12 | 25664201 | ND |
| 2014-05-13 | 25664601 | ND |
| 2014-05-14 | 25662601 | ND |
| 2014-05-14 | 25663601 | ND |
| 2014-05-19 | 26051901 | 0.0700 ppb |
| 2014-05-19 | 25662401 | ND |
| 2014-05-19 | 25661701 | ND |
| 2014-05-20 | 25663801 | ND |
| 2014-05-20 | 25666401 | ND |
| 2014-05-22 | 25663401 | 0.920 ppb |
| 2014-06-18 | 25663001 | ND |
| 2014-06-18 | 25662801 | ND |
| 2014-06-18 | 25664801 | ND |
| 2014-06-30 | 25665801 | ND |
| 2014-06-30 | 25665401 | ND |
| 2014-11-06 | 27542601 | 0.410 ppb |
| 2014-11-07 | 27540201 | ND |
| 2014-11-07 | 27543201 | ND |
| 2014-11-12 | 27543101 | ND |
| 2014-11-13 | 27541201 | ND |
| 2014-11-13 | 27542201 | ND |
| 2014-11-14 | 27542401 | ND |
| 2014-11-14 | 27540801 | ND |
| 2014-11-20 | 27539801 | ND |
| 2014-11-20 | 27538801 | ND |
| 2014-11-21 | 27541601 | ND |
| 2014-11-21 | 27539601 | 0.110 ppb |
| 2014-12-02 | 27541001 | ND |
| 2014-12-03 | 27543401 | ND |
| 2014-12-03 | 27540601 | ND |
| 2014-12-04 | 27546001 | ND |
| 2015-09-11 | 30377901 | 0.120 ppb |
| 2015-09-14 | 30378101 | ND |
| 2015-10-09 | 27541801 | ND |
| 2015-11-13 | 30780401 | 0.710 ppb |
| 2015-12-14 | 30886901 | 0.1000 ppb |
| 2017-01-31 | 34824701 | 0.260 ppb |
| 2017-01-31 | 34824301 | 0.530 ppb |
| 2017-02-02 | 34824801 | ND |
| 2017-02-02 | 34824901 | 0.1000 ppb |
| 2017-03-09 | 34824401 | ND |
| 2017-03-09 | 34824501 | ND |
| 2017-03-09 | 34824601 | ND |
| 2017-03-24 | 35267501 | ND |
| 2017-03-24 | 35267301 | ND |
| 2017-03-24 | 35267201 | ND |
| 2017-03-24 | 34825101 | ND |
| 2017-03-24 | 35267401 | ND |
| 2017-05-04 | 35266801 | ND |
| 2017-05-04 | 35266901 | 0.120 ppb |
| 2017-05-11 | 35267001 | 0.0800 ppb |
| 2017-05-16 | 35267101 | 0.140 ppb |
| 2017-07-10 | 36320101 | 0.0800 ppb |
| 2017-07-10 | 36320201 | ND |
| 2017-07-10 | 36320301 | 1.20 ppb |
| 2017-07-10 | 36320001 | 0.1000 ppb |
| 2017-09-08 | 37078301 | ND |
| 2017-09-08 | 37078101 | ND |
| 2017-09-08 | 37078001 | ND |
| 2017-09-08 | 37078201 | ND |
| 2017-11-13 | 37535801 | ND |
| 2017-11-13 | 37535701 | ND |
| 2017-12-15 | 37535901 | ND |
| 2018-09-05 | 40988101 | ND |
| 2018-09-05 | 40988001 | ND |
| 2019-05-06 | 43882901 | 0.0700 ppb |
| 2019-05-06 | 43882401 | ND |
| 2019-05-06 | 43882801 | ND |
| 2019-05-06 | 43882601 | 0.0700 ppb |
| 2019-05-06 | 43882201 | 0.120 ppb |
| 2019-05-06 | 43883001 | 0.0700 ppb |
| 2019-05-06 | 43883101 | 0.1000 ppb |
| 2019-05-23 | 44652001 | ND |
| 2019-05-23 | 44807501 | ND |
| 2019-05-23 | 44807201 | ND |
| 2019-05-24 | 44807301 | 0.0700 ppb |
| 2019-05-28 | 44807601 | 0.0900 ppb |
| 2019-05-30 | 44651801 | 0.120 ppb |
| 2019-05-30 | 44651701 | ND |
| 2019-05-30 | 44807401 | ND |
| 2019-05-30 | 44651901 | ND |
| 2019-06-06 | 44652101 | ND |
| 2019-06-06 | 44652301 | ND |
| 2019-06-06 | 44652201 | ND |
| 2019-06-11 | 44652401 | 1.27 ppb |
| 2019-06-13 | 44652701 | ND |
| 2019-06-13 | 44652501 | 0.140 ppb |
| 2019-06-28 | 44652601 | ND |
| 2019-06-28 | 44652801 | ND |
| 2019-07-31 | 45960201 | ND |
| 2019-07-31 | 45960401 | ND |
| 2019-07-31 | 45960501 | ND |