trans-1,2-Dichloroethylene
Golden State Water Company - Los Osos
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 | 5 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 10 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-01-02 | 2706-010-0810 | ND |
| 2014-01-02 | 2706-007-0835 | ND |
| 2014-01-02 | 2706-003-0915 | ND |
| 2014-01-02 | 2706-001-0745 | ND |
| 2014-07-02 | 2706-008-0850 | ND |
| 2016-05-11 | 2706-019-0718 | ND |
| 2017-02-21 | 9590-003-1010 | ND |
| 2017-02-21 | 9590-010-0825 | ND |
| 2017-02-21 | 9590-001-0842 | ND |
| 2017-07-12 | 9590-019-1010 | ND |
| 2017-07-18 | 9590-019-1000 | ND |
| 2017-09-26 | 9590-019-0830 | ND |
| 2017-10-30 | 9590-019-1405 | ND |
| 2017-11-02 | 9590-019-1550 | ND |
| 2017-12-12 | 9590-019-1015 | ND |
| 2017-12-12 | 9590-019-1035 | ND |
| 2018-02-13 | 9590-019-0840 | ND |
| 2018-03-13 | 9590-019-1015 | ND |
| 2019-01-14 | 9590-019-1500 | ND |