Know Your Environment. Protect Your Health.

1,4-Dioxane

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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.

Click here to read more about 1,4-dioxane.

 

16

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.600 ppb110.600 ppb
20151.46 ppb111.46 ppb
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
20190.240 ppb21ND - 0.480 ppb
20200.365 ppb21ND - 0.730 ppb
20210.180 ppb41ND - 0.720 ppb
2022ND30ND
20230.403 ppb330.170 ppb - 0.530 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
2014-08-18267465010.600 ppb
2015-02-24281878011.46 ppb
2019-08-1346172401ND
2019-11-041910F58-0010.480 ppb
2020-07-062007399-001AND
2020-10-052010271-001A0.730 ppb
2021-02-012102095-001A0.720 ppb
2021-04-052104337-001AND
2021-09-062109509-001AND
2021-12-062112564-001AND
2022-01-172201B57-001AND
2022-04-182204E26-001AND
2022-07-182207D35-001AND
2023-01-102301589-001A0.170 ppb
2023-08-082308716-001A0.510 ppb
2023-10-242310J10-001A0.530 ppb