trans-1,2-Dichloroethylene
Crwa Lake Dunlap Water Treatment Plant
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 | 1 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-09-11 | AC66717 | ND |
| 2015-07-23 | AD00789 | ND |
| 2015-10-13 | AD10477 | ND |
| 2016-01-19 | AD18676 | ND |
| 2016-06-24 | AD41883 | ND |
| 2016-07-13 | AD44082 | ND |
| 2016-10-06 | AD52688 | ND |
| 2017-02-07 | AD69278 | ND |
| 2017-05-08 | AD83112 | ND |
| 2017-07-24 | AD90378 | ND |
| 2017-10-05 | AD99587 | ND |
| 2018-02-09 | AE13316 | ND |
| 2018-04-04 | AE21232 | ND |
| 2018-07-09 | AE32634 | ND |
| 2018-10-03 | AE42553 | ND |
| 2019-01-23 | AE50979 | ND |
| 2019-04-16 | AE62778 | ND |
| 2019-08-08 | AE77766 | ND |
| 2019-10-07 | AE85816 | ND |