trans-1,2-Dichloroethylene
Aqua Pa Bristol
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 | 2 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 6 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-02-02 | AF75113 | ND |
| 2018-02-22 | AF76987 | ND |
| 2019-02-01 | AG07157 | ND |
| 2019-03-07 | AG10696 | ND |
| 2019-04-12 | AG14108 | ND |
| 2020-01-10 | 21483483.00 | ND |
| 2020-04-03 | 22002020.00 | ND |
| 2020-04-09 | 22002041.00 | ND |
| 2020-07-10 | 22586040.00 | ND |
| 2020-10-23 | 23162725.00 | ND |
| 2021-01-15 | 23692354.00 | ND |
| 2021-02-05 | 23869128.00 | ND |
| 2021-05-14 | 24417534.00 | ND |
| 2021-07-09 | 24807876.00 | ND |
| 2021-10-08 | 25383928.00 | ND |
| 2022-01-14 | 25922412.00 | ND |
| 2022-02-03 | 26099340.00 | ND |
| 2022-04-01 | 26443311.00 | ND |
| 2022-04-08 | 26443290.00 | ND |
| 2022-07-08 | 27016777.00 | ND |
| 2022-11-08 | 27804056.00 | ND |
| 2023-01-27 | 28152916.00 | ND |
| 2023-02-16 | 28330627.00 | ND |