trans-1,2-Dichloroethylene
Harlingen Water Works System
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 2 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | ND | 3 | 0 | ND |
2017 | ND | 1 | 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 |
---|---|---|
2014-05-07 | AC53367 | ND |
2014-07-22 | AC60487 | ND |
2015-06-18 | AC96506 | ND |
2015-09-22 | AD08062 | ND |
2016-06-27 | AD41903 | ND |
2016-09-28 | AD52054 | ND |
2016-09-28 | AD52086 | ND |
2017-08-02 | AD91849 | ND |
2018-06-13 | AE29818 | ND |
2018-07-26 | AE34710 | ND |
2019-08-07 | AE77495 | ND |
2019-08-07 | AE77507 | ND |