trans-1,2-Dichloroethylene
North Wales Water Authority
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 12 | 0 | ND |
| 2015 | ND | 13 | 0 | ND |
| 2016 | ND | 14 | 0 | ND |
| 2017 | ND | 13 | 0 | ND |
| 2018 | ND | 13 | 0 | ND |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-03-04 | 20140745 | ND |
| 2014-03-17 | 20140959 | ND |
| 2014-03-17 | 20140958 | ND |
| 2014-03-17 | 20140966 | ND |
| 2014-03-17 | 20140965 | ND |
| 2014-03-17 | 20140964 | ND |
| 2014-03-17 | 20140963 | ND |
| 2014-03-17 | 20140962 | ND |
| 2014-03-17 | 20140961 | ND |
| 2014-03-17 | 20140960 | ND |
| 2014-06-10 | 20141963 | ND |
| 2014-08-05 | 20142640 | ND |
| 2015-03-10 | 12516865 | ND |
| 2015-03-16 | 12516760 | ND |
| 2015-03-16 | 12516844 | ND |
| 2015-03-16 | 12516823 | ND |
| 2015-03-16 | 12516802 | ND |
| 2015-03-16 | 12516781 | ND |
| 2015-03-16 | 12516739 | ND |
| 2015-03-16 | 12516718 | ND |
| 2015-03-16 | 12516697 | ND |
| 2015-03-16 | 12516676 | ND |
| 2015-07-06 | 13014447 | ND |
| 2015-09-14 | 13265887 | ND |
| 2015-12-01 | 13634670 | ND |
| 2016-03-07 | 13987495 | ND |
| 2016-03-14 | 13987432 | ND |
| 2016-03-14 | 13987474 | ND |
| 2016-03-14 | 13987453 | ND |
| 2016-03-14 | 13987411 | ND |
| 2016-03-14 | 13987390 | ND |
| 2016-03-14 | 13987369 | ND |
| 2016-03-14 | 13987348 | ND |
| 2016-03-14 | 13987327 | ND |
| 2016-03-14 | 13987306 | ND |
| 2016-06-07 | 14407376 | ND |
| 2016-06-29 | 14407403 | ND |
| 2016-09-06 | 14909852 | ND |
| 2016-12-06 | 15374020 | ND |
| 2017-03-16 | 15797863 | ND |
| 2017-05-01 | 16096369 | ND |
| 2017-05-01 | 16096348 | ND |
| 2017-05-01 | 16096285 | ND |
| 2017-05-01 | 16096453 | ND |
| 2017-05-01 | 16096306 | ND |
| 2017-05-01 | 16096432 | ND |
| 2017-05-01 | 16096411 | ND |
| 2017-05-01 | 16096327 | ND |
| 2017-05-01 | 16096390 | ND |
| 2017-06-06 | 16259054 | ND |
| 2017-09-05 | 16728654 | ND |
| 2017-12-05 | 17163816 | ND |
| 2018-03-12 | 20180936 | ND |
| 2018-03-12 | 20180937 | ND |
| 2018-03-12 | 20180935 | ND |
| 2018-03-12 | 20180938 | ND |
| 2018-03-12 | 20180934 | ND |
| 2018-03-12 | 20180939 | ND |
| 2018-03-12 | 20180933 | ND |
| 2018-03-12 | 20180940 | ND |
| 2018-03-12 | 20180932 | ND |
| 2018-03-13 | 20180956 | ND |
| 2018-06-05 | 20182148 | ND |
| 2018-09-04 | 20183373 | ND |
| 2018-12-18 | 20184775 | ND |
| 2019-03-05 | 20190857 | ND |
| 2019-03-12 | 20190961 | ND |
| 2019-03-12 | 20190960 | ND |
| 2019-03-12 | 20190962 | ND |
| 2019-03-12 | 20190959 | ND |
| 2019-03-12 | 20190963 | ND |
| 2019-03-12 | 20190958 | ND |
| 2019-03-12 | 20190964 | ND |
| 2019-03-12 | 20190957 | ND |
| 2019-03-12 | 20190956 | ND |
| 2019-09-03 | 20193443 | ND |
| 2019-12-03 | 20194748 | ND |