1,4-Dioxane
Old Westbury
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 |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 0.0197 ppb | 6 | 3 | ND - 0.0440 ppb |
| 2020 | 0.0270 ppb | 20 | 12 | ND - 0.0610 ppb |
| 2021 | 0.0367 ppb | 11 | 9 | ND - 0.0670 ppb |
| 2022 | 0.0452 ppb | 11 | 10 | ND - 0.0780 ppb |
| 2023 | 0.0497 ppb | 11 | 10 | ND - 0.0810 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2019-11-12 | 70111490001 | ND |
| 2019-11-12 | 70111490002 | 0.0380 ppb |
| 2019-11-13 | 70111650001 | ND |
| 2019-11-13 | 70111650002 | 0.0440 ppb |
| 2019-11-14 | 70111791001 | ND |
| 2019-11-14 | 70111791002 | 0.0360 ppb |
| 2020-02-04 | 70120342002 | 0.0440 ppb |
| 2020-02-05 | 70120651001 | 0.0460 ppb |
| 2020-02-11 | 70121351001 | ND |
| 2020-02-18 | 70122151001 | 0.0470 ppb |
| 2020-02-24 | 70122752001 | ND |
| 2020-04-14 | 70128026001 | ND |
| 2020-04-16 | 70128227001 | 0.0480 ppb |
| 2020-04-27 | 70129218001 | ND |
| 2020-04-29 | 70129420001 | 0.0470 ppb |
| 2020-05-04 | 70129805001 | ND |
| 2020-05-04 | 70129805003 | 0.0550 ppb |
| 2020-08-25 | 70143187001 | ND |
| 2020-08-25 | 70143187002 | 0.0440 ppb |
| 2020-09-08 | 70144945001 | 0.0250 ppb |
| 2020-09-09 | 70145143001 | 0.0430 ppb |
| 2020-09-14 | 70145712001 | ND |
| 2020-09-21 | 70146589001 | ND |
| 2020-11-04 | 70152067002 | 0.0240 ppb |
| 2020-11-10 | 70152877001 | 0.0560 ppb |
| 2020-12-02 | 70155232001 | 0.0610 ppb |
| 2021-01-21 | 70160127002 | 0.0610 ppb |
| 2021-01-25 | 70160381001 | ND |
| 2021-05-05 | 70171626002 | 0.0670 ppb |
| 2021-05-12 | 70172680001 | 0.0390 ppb |
| 2021-05-26 | 70174518001 | 0.0270 ppb |
| 2021-08-11 | 70183644002 | 0.0370 ppb |
| 2021-08-18 | 70184479001 | ND |
| 2021-08-25 | 70185223002 | 0.0580 ppb |
| 2021-11-10 | 70194292001 | 0.0220 ppb |
| 2021-11-16 | 70194898001 | 0.0600 ppb |
| 2021-12-22 | 70198898001 | 0.0330 ppb |
| 2022-02-09 | 70203487001 | 0.0780 ppb |
| 2022-02-15 | 70204181001 | ND |
| 2022-03-09 | 70206884001 | 0.0500 ppb |
| 2022-04-27 | 70212478001-POCS | 0.0440 ppb |
| 2022-05-04 | 70213403001-POCS | 0.0310 ppb |
| 2022-05-25 | 70215952002 | 0.0620 ppb |
| 2022-08-17 | 70226250001 | 0.0220 ppb |
| 2022-08-24 | 70227004001 | 0.0410 ppb |
| 2022-11-14 | 70236636001-PFAS | 0.0710 ppb |
| 2022-11-16 | 70237103001-PFAS | 0.0630 ppb |
| 2022-12-21 | 70240933001-PFAS | 0.0350 ppb |
| 2023-02-08 | 70245579001-PFAS | 0.0440 ppb |
| 2023-02-15 | 70246419001 | 0.0810 ppb |
| 2023-02-22 | 70247119001 | 0.0520 ppb |
| 2023-04-19 | 70253384002 | 0.0720 ppb |
| 2023-05-03 | 70254928002 | 0.0250 ppb |
| 2023-05-10 | 70255820001 | 0.0530 ppb |
| 2023-08-16 | 70267149005 | 0.0470 ppb |
| 2023-08-17 | 70267372001 | ND |
| 2023-11-01 | 70276064002-PRI | 0.0710 ppb |
| 2023-11-08 | 70276911002-PRI | 0.0630 ppb |
| 2023-11-29 | 70279039002 | 0.0390 ppb |