trans-1,2-Dichloroethylene
Rapides Parish Waterworks District 3
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 14 | 0 | ND |
| 2021 | ND | 12 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 5 | 0 | ND |
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 |
|---|---|---|
| 2018-03-22 | 35381823001 | ND |
| 2018-03-22 | 35381823001 | ND |
| 2019-04-17 | 35463257001 | ND |
| 2019-04-17 | 35463257001 | ND |
| 2020-01-21 | 35525783003 | ND |
| 2020-01-21 | 35525783002 | ND |
| 2020-01-21 | 35525783001 | ND |
| 2020-03-11 | 35540206001 | ND |
| 2020-03-11 | 35537099001 | ND |
| 2020-04-07 | 35542640001 | ND |
| 2020-04-07 | 35542640002 | ND |
| 2020-04-22 | 35545475001 | ND |
| 2020-06-26 | 35559394001 | ND |
| 2020-06-26 | 35559394002 | ND |
| 2020-08-21 | 35572727002 | ND |
| 2020-08-21 | 35572727001 | ND |
| 2020-11-17 | 35593329002 | ND |
| 2020-11-17 | 35593329001 | ND |
| 2021-03-16 | 35619989001 | ND |
| 2021-03-16 | 35619989002 | ND |
| 2021-05-05 | 35631376001 | ND |
| 2021-05-05 | 35631390001 | ND |
| 2021-05-05 | 35631390002 | ND |
| 2021-06-02 | 35638318001 | ND |
| 2021-06-23 | 35643405001 | ND |
| 2021-07-01 | 35644790001 | ND |
| 2021-09-09 | 35662178001 | ND |
| 2021-09-09 | 35662178002 | ND |
| 2021-10-05 | 35668367001 | ND |
| 2021-10-05 | 35668367002 | ND |
| 2022-04-18 | 35712509001 | ND |
| 2023-01-18 | 35773982001 | ND |
| 2023-01-18 | 35773982002 | ND |
| 2023-01-18 | 35773982003 | ND |
| 2023-04-03 | 35790618001 | ND |
| 2023-10-26 | 35837466001 | ND |