trans-1,2-Dichloroethylene
Harris County Municipal Utility District 24
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 1 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 2 | 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 |
---|---|---|
2014-08-12 | AC63105 | ND |
2015-08-11 | AD03644 | ND |
2015-08-11 | AD03636 | ND |
2016-11-09 | AD57422 | ND |
2016-11-09 | AD57420 | ND |
2017-03-29 | AD77416 | ND |
2017-03-29 | AD77418 | ND |
2018-03-02 | AE16698 | ND |
2018-03-02 | AE16662 | ND |
2019-04-18 | AE62989 | ND |
2019-04-18 | AE62991 | ND |