trans-1,2-Dichloroethylene
UNH/Durham Water Sys
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 | 3 | 0 | ND |
2018 | ND | 3 | 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 |
---|---|---|
2014-10-23 | 137302.01 | ND |
2014-12-29 | 139426.01 | ND |
2015-07-15 | 145834.01 | ND |
2015-11-04 | 150026.01 | ND |
2016-08-17 | 159563.01 | ND |
2016-11-08 | 162651.01 | ND |
2016-11-08 | 162652.01 | ND |
2017-03-29 | 166973.01 | ND |
2017-06-21 | 170167.01 | ND |
2017-11-07 | 175741.01 | ND |
2018-08-30 | 186068.01 | ND |
2018-08-30 | 186067.01 | ND |
2018-11-26 | 189601.01 | ND |
2019-08-14 | 199213.01 | ND |
2019-10-23 | 202329.01 | ND |