1,4-Dioxane

SJWTX Triple Peak Plant

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	ND	19	ND
2014	ND	1	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	N/A	0	N/A

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	Q1302518017	ND
2013-06-18	Q1302518009	ND
2013-06-18	Q1302518011	ND
2013-06-18	Q1302518001	ND
2013-06-18	Q1302518003	ND
2013-06-19	Q1302518015	ND
2013-06-19	Q1302518013	ND
2013-06-19	Q1302518005	ND
2013-06-19	Q1302518007	ND
2013-09-25	Q1308037001	ND
2013-12-16	Q1318114009	ND
2013-12-16	Q1318114007	ND
2013-12-16	Q1318114001	ND
2013-12-16	Q1318114003	ND
2013-12-16	Q1318114015	ND
2013-12-17	Q1318114005	ND
2013-12-17	Q1318114017	ND
2013-12-17	Q1318114011	ND
2013-12-17	Q1318114013	ND
2014-03-31	Q1410037001	ND