trans-1,2-Dichloroethylene
Monte Vista Water 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.
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 11 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2016-08-01 | 3761-039-0930 | ND |
| 2016-08-01 | 3761-004-1035 | ND |
| 2016-08-01 | 3761-013-0950 | ND |
| 2016-08-01 | 3761-024-1050 | ND |
| 2016-08-02 | 3761-009-1410 | ND |
| 2016-08-02 | 3761-034-1110 | ND |
| 2016-08-03 | 3761-045-1145 | ND |
| 2016-08-03 | 3761-037-0945 | ND |
| 2016-08-04 | 3761-038-0935 | ND |
| 2016-08-08 | 3761-025-1250 | ND |
| 2016-08-08 | 3761-003-1010 | ND |
| 2017-06-20 | 3761-036-0845 | ND |
| 2019-07-03 | 3761-036-1000 | ND |
| 2019-07-03 | 3761-003-1215 | ND |
| 2019-07-03 | 3761-039-1100 | ND |
| 2019-07-10 | 3761-024-1220 | ND |
| 2019-07-11 | 3761-013-0855 | ND |
| 2019-07-11 | 3761-037-0935 | ND |
| 2019-07-25 | 3761-004-0930 | ND |
| 2019-09-26 | 3761-034-1220 | ND |