1,1,1,2-Tetrachloroethane

City of Watsonville

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

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	15	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	ND	14	ND
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 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
2014-02-19	9590-009-1430	ND
2014-03-19	9590-004-0800	ND
2014-03-19	9590-030-0900	ND
2014-03-19	9590-029-0845	ND
2014-03-19	9590-016-0900	ND
2014-03-19	9590-015-0805	ND
2014-03-19	9590-014-0740	ND
2014-03-19	9590-013-0835	ND
2014-03-19	9590-012-0920	ND
2014-03-19	9590-011-1000	ND
2014-03-19	9590-010-0915	ND
2014-03-19	9590-009-1100	ND
2014-03-19	9590-007-0840	ND
2014-03-19	9590-006-0800	ND
2014-03-19	9590-005-0745	ND
2017-03-15	9590-004-1040	ND
2017-03-15	9590-030-1100	ND
2017-03-15	9590-029-0830	ND
2017-03-15	9590-016-0840	ND
2017-03-15	9590-015-1010	ND
2017-03-15	9590-014-0825	ND
2017-03-15	9590-013-0945	ND
2017-03-15	9590-012-0935	ND
2017-03-15	9590-011-1010	ND
2017-03-15	9590-010-0955	ND
2017-03-15	9590-009-1030	ND
2017-03-15	9590-007-1100	ND
2017-03-15	9590-006-0910	ND
2017-03-15	9590-005-0905	ND