trans-1,2-Dichloroethylene

City of Colton

1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.

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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
2013	N/A	0	N/A
2014	ND	3	ND
2015	ND	1	ND
2016	ND	12	ND
2017	N/A	0	N/A
2018	ND	2	ND
2019	ND	10	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 60 ppb

The EWG Health Guideline of 60 ppb for trans-1,2-dichloroethylene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for trans-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-19	3761-030-0740	ND
2014-05-08	3761-030-0740	ND
2014-08-19	3761-030-0930	ND
2015-08-20	3761-010-0640	ND
2016-06-13	3761-016-1030	ND
2016-09-07	3761-008-0800	ND
2016-09-07	3761-024-1325	ND
2016-09-07	3761-021-0845	ND
2016-09-07	3761-011-0810	ND
2016-09-07	3761-017-0705	ND
2016-09-07	3761-030-0900	ND
2016-09-07	3761-016-0925	ND
2016-09-07	3761-015-0745	ND
2016-09-07	3761-014-0730	ND
2016-09-07	3761-010-1535	ND
2016-12-14	3761-023-1020	ND
2018-06-12	3761-023-1000	ND
2018-09-06	3761-012-1330	ND
2019-07-30	3761-017-0830	ND
2019-09-12	3761-030-0955	ND
2019-09-12	3761-017-1040	ND
2019-09-12	3761-021-1100	ND
2019-09-12	3761-016-1020	ND
2019-09-12	3761-011-1320	ND
2019-09-16	3761-023-0000	ND
2019-09-16	3761-015-0000	ND
2019-09-16	3761-010-0000	ND
2019-09-16	3761-012-0000	ND