trans-1,2-Dichloroethylene
Concord Water Department
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 | 4 | 0 | ND |
2015 | ND | 5 | 0 | ND |
2016 | ND | 5 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 5 | 0 | ND |
2019 | ND | 5 | 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 |
---|---|---|
2014-10-31 | 137495.02 | ND |
2014-10-31 | 137495.03 | ND |
2014-10-31 | 137495.04 | ND |
2014-10-31 | 137495.01 | ND |
2015-08-07 | 146612.01 | ND |
2015-10-15 | 149110.01 | ND |
2015-10-15 | 149110.02 | ND |
2015-10-15 | 149110.03 | ND |
2015-10-15 | 149110.04 | ND |
2016-08-05 | 159131.01 | ND |
2016-10-07 | 161374.02 | ND |
2016-10-07 | 161374.03 | ND |
2016-10-07 | 161374.04 | ND |
2016-10-07 | 161374.05 | ND |
2017-11-13 | 175839.02 | ND |
2017-11-13 | 175839.05 | ND |
2017-11-13 | 175839.04 | ND |
2017-11-13 | 175839.03 | ND |
2018-07-02 | 183690.01 | ND |
2018-10-01 | 187223.01 | ND |
2018-10-01 | 187223.02 | ND |
2018-10-01 | 187223.03 | ND |
2018-10-01 | 187223.04 | ND |
2019-07-01 | 197248.01 | ND |
2019-10-03 | 201192.02 | ND |
2019-10-03 | 201192.03 | ND |
2019-10-03 | 201192.04 | ND |
2019-10-03 | 201192.05 | ND |