trans-1,2-Dichloroethylene
Conyngham 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 |
|---|---|---|---|---|
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 5 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-04-17 | 7048808001 | ND |
| 2018-04-17 | 7048808002 | ND |
| 2018-04-17 | 7048808003 | ND |
| 2019-03-12 | 1903-156-2 | ND |
| 2019-03-12 | 19030-156-1 | ND |
| 2019-03-12 | 1903-156-1 | ND |
| 2020-03-02 | 21862231.00 | ND |
| 2020-03-02 | 21862211.00 | ND |
| 2020-03-02 | 21862191.00 | ND |
| 2020-03-02 | 21862171.00 | ND |
| 2020-03-02 | 21862151.00 | ND |
| 2021-06-01 | 24454891.00 | ND |
| 2021-06-01 | 24454871.00 | ND |
| 2021-06-01 | 24454911.00 | ND |
| 2022-04-04 | 26478818.00 | ND |
| 2022-04-04 | 26478838.00 | ND |
| 2022-04-04 | 26478858.00 | ND |
| 2023-03-06 | 28536376.00 | ND |
| 2023-03-06 | 28536396.00 | ND |
| 2023-03-06 | 28536416.00 | ND |
| 2023-12-12 | 30259326.00 | ND |
| 2023-12-12 | 30259306.00 | ND |