trans-1,2-Dichloroethylene
Searchlight Water Company
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 | 4 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-03-19 | 14030180-002 | ND |
| 2014-06-04 | 14060069-002 | ND |
| 2014-09-03 | 14090021-002 | ND |
| 2014-12-10 | 14120210-002 | ND |
| 2015-03-18 | 15030325-002 | ND |
| 2016-02-22 | 16020303-003 | ND |
| 2016-04-19 | 16040314-004 | ND |
| 2016-04-26 | 16040421-003 | ND |
| 2016-05-23 | 16050216-002 | ND |
| 2016-05-23 | S1601860002 | ND |
| 2016-06-20 | S1602326002 | ND |
| 2016-06-20 | S1602326003 | ND |
| 2016-06-20 | S1602326002 | ND |
| 2016-07-26 | S1603481005 | ND |
| 2016-07-26 | S1603481005 | ND |
| 2016-10-18 | S1603684005 | ND |
| 2016-10-18 | S1603684001 | ND |
| 2017-04-19 | S1605704005 | ND |
| 2017-05-24 | S1702538005 | ND |
| 2018-04-18 | S1802701002 | ND |
| 2019-04-17 | S1904261003 | ND |
| 2019-04-17 | S1904261004 | ND |
| 2019-04-17 | S1904261005 | ND |
| 2019-06-06 | S1912241002 | ND |