Know Your Environment. Protect Your Health.

cis-1,2-Dichloroethylene

El Oso Water Supply Corporation

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND40ND
2021ND20ND
2022ND20ND
2023ND30ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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 Lab ID Result
2018-01-24AE10200ND
2018-01-24AE10234ND
2019-02-19AE54844ND
2019-02-19AE54850ND
2020-06-09AF14659ND
2020-06-09AF14661ND
2020-09-11AF27359ND
2020-11-13AF34597ND
2021-01-26AF41115ND
2021-01-26AF41117ND
2022-03-10AF88679ND
2022-03-10AF88683ND
2023-02-16AG29365ND
2023-02-16AG29367ND
2023-03-29AG34750ND