trans-1,2-Dichloroethylene

Peoples Water Service Company

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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249

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	ND	40	0	ND
2015	ND	45	0	ND
2016	ND	37	0	ND
2017	ND	41	0	ND
2018	0.0284 ppb	44	5	ND - 0.250 ppb
2019	ND	42	0	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	Result
2014-01-13	ND
2014-01-13	ND
2014-01-14	ND
2014-01-14	ND
2014-02-13	ND
2014-02-13	ND
2014-02-13	ND
2014-02-19	ND
2014-03-12	ND
2014-03-12	ND
2014-03-12	ND
2014-05-14	ND
2014-05-14	ND
2014-05-14	ND
2014-05-14	ND
2014-06-11	ND
2014-06-11	ND
2014-06-11	ND
2014-07-14	ND
2014-07-14	ND
2014-07-14	ND
2014-07-14	ND
2014-07-14	ND
2014-08-13	ND
2014-08-13	ND
2014-08-13	ND
2014-09-11	ND
2014-09-11	ND
2014-09-11	ND
2014-10-09	ND
2014-10-09	ND
2014-10-09	ND
2014-10-09	ND
2014-10-09	ND
2014-11-12	ND
2014-11-12	ND
2014-11-12	ND
2014-12-10	ND
2014-12-10	ND
2014-12-10	ND
2015-01-13	ND
2015-01-13	ND
2015-01-13	ND
2015-01-13	ND
2015-01-13	ND
2015-02-08	ND
2015-02-11	ND
2015-02-11	ND
2015-02-11	ND
2015-03-09	ND
2015-03-09	ND
2015-03-09	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-05-13	ND
2015-05-13	ND
2015-05-13	ND
2015-06-15	ND
2015-06-15	ND
2015-06-15	ND
2015-07-06	ND
2015-07-06	ND
2015-07-06	ND
2015-07-06	ND
2015-07-06	ND
2015-08-12	ND
2015-08-12	ND
2015-08-12	ND
2015-09-08	ND
2015-09-08	ND
2015-09-08	ND
2015-10-12	ND
2015-10-12	ND
2015-10-12	ND
2015-10-12	ND
2015-11-11	ND
2015-11-11	ND
2015-11-11	ND
2015-11-12	ND
2015-12-07	ND
2015-12-07	ND
2015-12-07	ND
2016-01-05	ND
2016-01-05	ND
2016-01-05	ND
2016-01-05	ND
2016-01-05	ND
2016-02-08	ND
2016-02-08	ND
2016-03-08	ND
2016-03-08	ND
2016-03-08	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-04-06	ND
2016-05-02	ND
2016-05-02	ND
2016-05-02	ND
2016-06-07	ND
2016-06-07	ND
2016-06-07	ND
2016-07-12	ND
2016-07-12	ND
2016-07-12	ND
2016-07-12	ND
2016-07-12	ND
2016-08-15	ND
2016-09-06	ND
2016-09-06	ND
2016-09-06	ND
2016-10-11	ND
2016-10-11	ND
2016-10-11	ND
2016-10-11	ND
2016-10-11	ND
2016-12-13	ND
2016-12-13	ND
2017-01-16	ND
2017-01-16	ND
2017-01-16	ND
2017-02-01	ND
2017-02-01	ND
2017-03-06	ND
2017-03-06	ND
2017-03-06	ND
2017-03-28	ND
2017-04-10	ND
2017-04-10	ND
2017-04-10	ND
2017-04-10	ND
2017-04-10	ND
2017-05-08	ND
2017-05-08	ND
2017-05-08	ND
2017-06-14	ND
2017-06-14	ND
2017-06-14	ND
2017-07-11	ND
2017-07-11	ND
2017-07-11	ND
2017-07-11	ND
2017-07-19	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-09-18	ND
2017-09-18	ND
2017-09-18	ND
2017-10-11	ND
2017-10-11	ND
2017-10-11	ND
2017-10-11	ND
2017-10-11	ND
2017-11-08	ND
2017-11-08	ND
2017-11-08	ND
2017-12-12	ND
2017-12-12	ND
2018-01-10	ND
2018-01-10	ND
2018-01-10	ND
2018-01-10	ND
2018-01-10	ND
2018-02-14	ND
2018-02-14	ND
2018-02-14	ND
2018-03-14	ND
2018-03-14	ND
2018-04-11	0.250 ppb
2018-04-11	0.250 ppb
2018-04-11	0.250 ppb
2018-04-11	0.250 ppb
2018-04-11	0.250 ppb
2018-05-09	ND
2018-05-09	ND
2018-05-09	ND
2018-06-13	ND
2018-06-13	ND
2018-06-20	ND
2018-07-09	ND
2018-07-09	ND
2018-07-09	ND
2018-07-09	ND
2018-07-09	ND
2018-08-13	ND
2018-08-13	ND
2018-08-13	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-10-08	ND
2018-10-08	ND
2018-10-08	ND
2018-10-08	ND
2018-10-08	ND
2018-11-12	ND
2018-11-12	ND
2018-11-12	ND
2018-12-10	ND
2018-12-10	ND
2018-12-10	ND
2018-12-10	ND
2019-01-15	ND
2019-01-15	ND
2019-01-15	ND
2019-01-15	ND
2019-02-12	ND
2019-02-12	ND
2019-03-12	ND
2019-03-12	ND
2019-03-12	ND
2019-04-09	ND
2019-04-09	ND
2019-04-09	ND
2019-04-09	ND
2019-04-09	ND
2019-05-20	ND
2019-05-20	ND
2019-05-20	ND
2019-06-17	ND
2019-06-17	ND
2019-06-17	ND
2019-07-08	ND
2019-07-08	ND
2019-07-09	ND
2019-07-09	ND
2019-07-11	ND
2019-08-12	ND
2019-08-12	ND
2019-08-13	ND
2019-09-10	ND
2019-09-10	ND
2019-09-10	ND
2019-10-07	ND
2019-10-07	ND
2019-10-07	ND
2019-10-07	ND
2019-10-07	ND
2019-11-11	ND
2019-11-11	ND
2019-11-11	ND
2019-12-10	ND
2019-12-10	ND
2019-12-10	ND