trans-1,2-Dichloroethylene
Stanley Lake Municipal Utility District
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 | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 6 | 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 |
|---|---|---|
| 2018-02-20 | AE14459 | ND |
| 2018-02-20 | AE14433 | ND |
| 2019-03-04 | AE56885 | ND |
| 2019-03-04 | AE56889 | ND |
| 2020-08-11 | AF22868 | ND |
| 2020-08-11 | AF22870 | ND |
| 2020-08-11 | AF22872 | ND |
| 2020-11-20 | AF35494 | ND |
| 2021-01-14 | AF39546 | ND |
| 2021-01-14 | AF39560 | ND |
| 2021-01-14 | AF39570 | ND |
| 2021-04-14 | AF50172 | ND |
| 2022-08-04 | AG07883 | ND |
| 2022-08-04 | AG07885 | ND |
| 2022-08-04 | AG07889 | ND |
| 2022-08-04 | AG07891 | ND |
| 2022-10-18 | AG17399 | ND |
| 2022-10-18 | AG17401 | ND |
| 2023-01-25 | AG26238 | ND |
| 2023-01-25 | AG26240 | ND |
| 2023-01-25 | AG26244 | ND |
| 2023-01-25 | AG26258 | ND |
| 2023-04-10 | AG36106 | ND |