1,1,1,2-Tetrachloroethane

Seabrook Water Department

1,1,1,2-Tetrachloroethane is a synthetic chemical used in metal degreasing and as an intermediate in industrial chemical production.

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	N/A	0	N/A
2014	ND	5	ND
2015	ND	5	ND
2016	ND	5	ND
2017	ND	5	ND
2018	ND	5	ND
2019	ND	6	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppb

The EWG Health Guideline of 1 ppb for 1,1,1,2-tetrachloroethane 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
2014-02-11	1402-00181-001	ND
2014-05-08	1405-00260-001	ND
2014-07-29	1407-00835-001	ND
2014-08-07	1408-00253-001	ND
2014-08-07	1408-00255-001	ND
2015-01-21	1501-00978-001	ND
2015-05-07	1505-00682-001	ND
2015-08-24	1508-01935-001	ND
2015-08-31	1508-02458-001	ND
2015-08-31	1508-02455-001	ND
2016-01-25	1601-01693-001	ND
2016-06-02	1606-00330-001	ND
2016-07-26	1607-02666-001	ND
2016-07-26	1607-02671-001	ND
2016-07-26	1607-02675-001	ND
2017-02-02	1702-00228-001	ND
2017-04-14	1704-01361-001	ND
2017-07-17	1707-01722-001	ND
2017-07-17	1707-01726-001	ND
2017-07-17	1707-01732-001	ND
2018-03-27	1803-02184-001	ND
2018-05-15	1805-01978-001	ND
2018-08-07	1808-01032-001	ND
2018-08-07	1808-01033-001	ND
2018-08-07	1808-01034-001	ND
2019-02-05	1902-00312-001	ND
2019-05-07	1905-00838-001	ND
2019-07-11	1907-01450-001	ND
2019-07-11	1907-01457-001	ND
2019-07-11	1907-01506-001	ND
2019-07-23	1907-03271-001	ND