trans-1,2-Dichloroethylene
State College Boro Water Auth.
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2018-02-14 | 8B14177-01 | ND |
| 2019-02-12 | 9B12139-01 | ND |
| 2020-02-12 | 21735634.00 | ND |
| 2020-02-12 | 21735633.00 | ND |
| 2020-02-12 | 21735632.00 | ND |
| 2020-02-12 | 21735631.00 | ND |
| 2020-02-12 | 21735630.00 | ND |
| 2021-02-16 | 23953998.00 | ND |
| 2021-04-07 | 24321972.00 | ND |
| 2021-08-16 | 25098839.00 | ND |
| 2021-09-13 | 25291242.00 | ND |
| 2021-11-15 | 25654888.00 | ND |
| 2022-02-15 | 26182288.00 | ND |
| 2022-09-01 | 27520791.00 | ND |
| 2022-11-16 | 27890868.00 | ND |
| 2023-02-14 | 28415058.00 | ND |
| 2023-05-16 | 28981579.00 | ND |
| 2023-08-14 | 29577817.00 | ND |
| 2023-11-13 | 30139900.00 | ND |
| 2023-12-20 | 30314238.00 | ND |
| 2023-12-20 | 30314301.00 | ND |
| 2023-12-20 | 30314259.00 | ND |
| 2023-12-20 | 30314280.00 | ND |