1,4-Dioxane
WA of Great Neck North
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 | 0.315 ppb | 16 | 12 | ND - 1.24 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 | 0.254 ppb | 34 | 29 | ND - 1.30 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 |
|---|---|---|
| 2014-04-08 | 201809158 | 0.230 ppb |
| 2014-04-08 | 201809334 | 0.120 ppb |
| 2014-04-08 | 201809151 | 0.570 ppb |
| 2014-04-08 | 201809166 | 0.290 ppb |
| 2014-04-08 | 201809126 | 1.24 ppb |
| 2014-04-23 | 201809134 | 0.140 ppb |
| 2014-04-23 | 201809143 | 0.1000 ppb |
| 2014-04-23 | 201809119 | ND |
| 2014-09-04 | 201809335 | ND |
| 2014-09-04 | 201809167 | 0.240 ppb |
| 2014-09-04 | 201809118 | ND |
| 2014-09-04 | 201809142 | ND |
| 2014-09-05 | 201809135 | 0.110 ppb |
| 2014-09-05 | 201809150 | 0.650 ppb |
| 2014-09-05 | 201809159 | 0.200 ppb |
| 2014-11-20 | 201809127 | 1.15 ppb |
| 2019-02-20 | 7080145001 | 0.520 ppb |
| 2019-02-20 | 7080145002 | 0.0740 ppb |
| 2019-03-06 | 7081473002 | 0.780 ppb |
| 2019-03-06 | 7081473001 | 0.0980 ppb |
| 2019-03-13 | 7082245001 | 0.0560 ppb |
| 2019-03-13 | 7082245002 | 0.110 ppb |
| 2019-03-13 | 7082245003 | ND |
| 2019-06-05 | 7092235003 | 0.120 ppb |
| 2019-06-05 | 7092235004 | 0.520 ppb |
| 2019-06-19 | 7094334002 | 1.30 ppb |
| 2019-06-19 | 7094334004 | 0.0650 ppb |
| 2019-06-19 | 7094334001 | ND |
| 2019-06-26 | 7095342001 | 0.250 ppb |
| 2019-06-26 | 7095342002 | ND |
| 2019-08-07 | 70100286001 | 0.0330 ppb |
| 2019-08-21 | 70102287001 | ND |
| 2019-08-21 | 70102287002 | 1.20 ppb |
| 2019-08-21 | 70102287004 | 0.0920 ppb |
| 2019-09-04 | 70103674003 | 0.130 ppb |
| 2019-09-04 | 70103674004 | 0.440 ppb |
| 2019-09-11 | 70104595003 | 0.0560 ppb |
| 2019-09-11 | 70104595002 | 0.270 ppb |
| 2019-09-11 | 70104595001 | 0.170 ppb |
| 2019-09-11 | 70104595007 | 0.0230 ppb |
| 2019-10-29 | 70110024003 | 0.0600 ppb |
| 2019-10-29 | 70110024002 | ND |
| 2019-11-06 | 70110881003 | 0.0740 ppb |
| 2019-11-06 | 70110881004 | 0.420 ppb |
| 2019-11-06 | 70110881001 | 0.0410 ppb |
| 2019-11-13 | 70111731002 | 0.200 ppb |
| 2019-11-13 | 70111731003 | 0.0670 ppb |
| 2019-11-13 | 70111731001 | 0.110 ppb |
| 2019-11-20 | 70112589001 | 1.20 ppb |
| 2019-11-27 | 70113513001 | 0.170 ppb |