Know Your Environment. Protect Your Health.

trans-1,2-Dichloroethylene

Whitworth Water District 2

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND130ND
2020N/A00N/A
2021ND30ND
2022ND110ND
2023ND10ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-20ND
2019-04-18ND
2019-04-18ND
2019-04-18ND
2019-04-18ND
2019-05-09ND
2019-05-21ND
2019-05-21ND
2019-05-28ND
2019-05-28ND
2019-05-28ND
2019-05-28ND
2019-06-18ND
2019-06-21ND
2021-03-184094088ND
2021-07-084138074ND
2021-10-284196693ND
2022-01-244236842ND
2022-03-314261610ND
2022-04-214272384ND
2022-04-214272380ND
2022-05-184288406ND
2022-06-274309802ND
2022-06-274309800ND
2022-07-144309807ND
2022-07-144309808ND
2022-07-144309809ND
2022-10-114356380ND
2023-04-274452170ND