trans-1,2-Dichloroethylene
City of Bandera
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 |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-05-01 | AC52597 | ND |
| 2014-05-01 | AC52591 | ND |
| 2015-01-14 | AC76215 | ND |
| 2015-01-14 | AC76205 | ND |
| 2015-01-14 | AC76231 | ND |
| 2015-05-26 | AC93276 | ND |
| 2016-01-21 | AD19277 | ND |
| 2016-02-08 | AD22471 | ND |
| 2017-06-28 | AD88048 | ND |
| 2017-06-28 | AD88044 | ND |
| 2018-02-15 | AE14143 | ND |
| 2018-02-15 | AE14111 | ND |
| 2018-05-30 | AE28057 | ND |
| 2018-09-18 | AE40785 | ND |
| 2018-10-31 | AE45056 | ND |
| 2019-01-10 | AE49333 | ND |
| 2019-01-10 | AE49323 | ND |
| 2019-01-10 | AE49329 | ND |