trans-1,2-Dichloroethylene
Altoona Water Authority
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 | 6 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 8 | 0 | ND |
| 2022 | ND | 6 | 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 |
|---|---|---|
| 2018-08-28 | 8H28046-01 | ND |
| 2018-08-28 | 8H28044-01 | ND |
| 2018-08-28 | 8H28051-01 | ND |
| 2018-08-28 | 8H28032-01 | ND |
| 2018-08-28 | 8H28031-01 | ND |
| 2018-08-28 | 8H28047-01 | ND |
| 2019-11-06 | 9K07058-01 | ND |
| 2019-11-06 | 9K07058-03 | ND |
| 2019-11-07 | 9K07074-01 | ND |
| 2019-11-07 | 9K07072-01 | ND |
| 2019-12-05 | 9L05126-01 | ND |
| 2020-02-06 | 21729176.00 | ND |
| 2020-08-05 | 22869707.00 | ND |
| 2020-08-05 | 22869706.00 | ND |
| 2020-08-05 | 22869705.00 | ND |
| 2020-08-10 | 22869918.00 | ND |
| 2020-08-10 | 22869919.00 | ND |
| 2020-08-10 | 22869917.00 | ND |
| 2021-07-01 | 24897505.00 | ND |
| 2021-07-08 | 24897526.00 | ND |
| 2021-08-10 | 25092083.00 | ND |
| 2021-08-10 | 25092027.00 | ND |
| 2021-08-10 | 25092082.00 | ND |
| 2021-08-10 | 25092028.00 | ND |
| 2021-08-10 | 25092029.00 | ND |
| 2021-12-13 | 25828702.00 | ND |
| 2022-02-24 | 26177239.00 | ND |
| 2022-08-16 | 27309601.00 | ND |
| 2022-08-16 | 27309677.00 | ND |
| 2022-08-16 | 27308842.00 | ND |
| 2022-08-16 | 27309643.00 | ND |
| 2022-11-10 | 27885524.00 | ND |
| 2023-07-26 | 29371569.00 | ND |
| 2023-07-26 | 29371526.00 | ND |
| 2023-07-26 | 29371482.00 | ND |
| 2023-07-26 | 29371548.00 | ND |
| 2023-07-26 | 29371504.00 | ND |