cis-1,2-Dichloroethylene

Riviera Beach Utility District

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	Detections	Range of results
2014	ND	1	0	ND
2015	0.671 ppb	16	5	ND - 5.20 ppb
2016	0.578 ppb	22	4	ND - 5.25 ppb
2017	ND	6	0	ND
2018	N/A	0	0	N/A
2019	0.184 ppb	2	2	0.117 ppb - 0.250 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 70 ppb

The legal limit for cis-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
2014-09-17	ND
2015-06-18	0.730 ppb
2015-09-22	ND
2015-09-23	ND
2015-09-23	1.12 ppb
2015-09-23	1.79 ppb
2015-09-23	1.89 ppb
2015-09-23	5.20 ppb
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-09-23	ND
2015-12-16	ND
2016-03-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	4.97 ppb
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-09-19	ND
2016-09-21	ND
2016-09-21	ND
2016-09-21	ND
2016-09-21	0.510 ppb
2016-09-21	ND
2016-09-21	1.98 ppb
2016-09-21	ND
2016-09-21	5.25 ppb
2017-03-06	ND
2017-03-06	ND
2017-03-06	ND
2017-06-19	ND
2017-11-13	ND
2017-12-05	ND
2019-06-07	0.117 ppb
2019-06-10	0.250 ppb