trans-1,2-Dichloroethylene
Mountain Water & Sanitation 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.
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 | 3 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 5 | 0 | ND |
2019 | ND | 4 | 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 | Result |
---|---|
2014-01-15 | ND |
2014-02-12 | ND |
2015-03-30 | ND |
2015-05-13 | ND |
2015-05-19 | ND |
2015-06-10 | ND |
2016-05-12 | ND |
2016-06-07 | ND |
2016-08-18 | ND |
2018-05-15 | ND |
2018-05-15 | ND |
2018-05-15 | ND |
2018-05-15 | ND |
2018-08-21 | ND |
2019-04-24 | ND |
2019-05-02 | ND |
2019-11-12 | ND |
2019-11-12 | ND |