trans-1,2-Dichloroethylene
Chaffee PWS
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-01-10 | AD12050 | ND |
| 2018-05-06 | AD18663 | ND |
| 2018-07-16 | AD29540 | ND |
| 2018-10-15 | AD35060 | ND |
| 2019-01-09 | AD38372 | ND |
| 2019-04-08 | AD46663 | ND |
| 2019-07-10 | AD52709 | ND |
| 2019-10-20 | AD57371 | ND |
| 2020-01-13 | AD60690 | ND |
| 2020-04-15 | 2004281 | ND |
| 2020-07-15 | 2011704 | ND |
| 2020-10-18 | 2016623 | ND |
| 2021-01-11 | 2020222 | ND |
| 2021-04-12 | 2103835 | ND |
| 2021-07-12 | 2113757 | ND |
| 2021-10-19 | 2118151 | ND |
| 2022-01-05 | 2121647 | ND |
| 2022-04-13 | 2204388 | ND |
| 2022-07-11 | 2214803 | ND |
| 2022-10-09 | 2219685 | ND |
| 2023-01-09 | 2223354 | ND |
| 2023-04-12 | 2303495 | ND |
| 2023-07-16 | 2311711 | ND |
| 2023-10-18 | 2316866 | ND |