trans-1,2-Dichloroethylene
City of Shavano Park
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 |
|---|---|---|
| 2018-03-02 | AE16674 | ND |
| 2018-03-02 | AE16676 | ND |
| 2018-03-02 | AE16700 | ND |
| 2018-03-02 | AE16668 | ND |
| 2019-04-03 | AE61029 | ND |
| 2019-04-03 | AE61035 | ND |
| 2019-04-03 | AE61039 | ND |
| 2019-04-03 | AE61047 | ND |
| 2020-02-24 | AE99519 | ND |
| 2020-02-24 | AE99539 | ND |
| 2020-02-24 | AE99541 | ND |
| 2020-05-15 | AF11875 | ND |
| 2021-02-23 | AF43941 | ND |
| 2021-02-23 | AF43945 | ND |
| 2021-02-23 | AF43943 | ND |
| 2021-06-18 | AF58893 | ND |
| 2022-03-09 | AF88394 | ND |
| 2022-03-09 | AF88406 | ND |
| 2022-03-09 | AF88408 | ND |
| 2022-03-09 | AF88412 | ND |
| 2023-06-22 | AG45585 | ND |
| 2023-06-22 | AG45593 | ND |
| 2023-06-22 | AG45601 | ND |
| 2023-06-22 | AG45603 | ND |