Know Your Environment. Protect Your Health.

cis-1,2-Dichloroethylene

Littleton Water Department

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND70ND
2020ND70ND
2021ND90ND
2022ND90ND
2023ND110ND

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 Result
2018-04-11ND
2018-05-01ND
2018-05-01ND
2018-05-01ND
2018-05-07ND
2018-05-07ND
2018-06-19ND
2019-05-01ND
2019-05-01ND
2019-05-01ND
2019-05-01ND
2019-05-30ND
2019-06-05ND
2019-06-17ND
2020-05-14ND
2020-05-14ND
2020-05-26ND
2020-05-26ND
2020-05-26ND
2020-05-26ND
2020-06-16ND
2021-04-05ND
2021-04-05ND
2021-04-05ND
2021-04-05ND
2021-04-05ND
2021-04-12ND
2021-06-09ND
2021-07-26ND
2021-10-21ND
2022-02-16ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2023-05-25ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-06-16ND
2023-07-20ND
2023-10-04ND