trans-1,2-Dichloroethylene
Aqua Pa Bristol
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-01-10 | AE20136 | ND |
| 2014-04-17 | AE29694 | ND |
| 2014-04-17 | AE29704 | ND |
| 2014-07-25 | AE41526 | ND |
| 2014-10-10 | AE52027 | ND |
| 2015-01-09 | 12271445 | ND |
| 2015-02-06 | 12387483 | ND |
| 2015-04-17 | 12618238 | ND |
| 2015-07-31 | 12998807 | ND |
| 2015-10-16 | 13375700 | ND |
| 2016-01-06 | 13738148 | ND |
| 2016-01-15 | 13738169 | ND |
| 2016-04-15 | 14086775 | ND |
| 2016-07-21 | 14550555 | ND |
| 2016-10-26 | 15059931 | ND |
| 2017-01-06 | 15499344 | ND |
| 2017-04-07 | 15919084 | ND |
| 2017-08-18 | 16547712 | ND |
| 2017-09-21 | 16709712 | ND |
| 2018-02-02 | AF75113 | ND |
| 2018-02-22 | AF76987 | ND |
| 2019-02-01 | AG07157 | ND |
| 2019-03-07 | AG10696 | ND |
| 2019-04-12 | AG14108 | ND |