trans-1,2-Dichloroethylene
Clare, City of
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 0.146 ppb | 9 | 2 | ND - 0.730 ppb |
| 2021 | 0.156 ppb | 11 | 3 | ND - 0.580 ppb |
| 2022 | 0.149 ppb | 10 | 2 | ND - 0.830 ppb |
| 2023 | 0.0550 ppb | 10 | 1 | ND - 0.550 ppb |
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 |
|---|---|---|
| 2020-01-08 | ND | |
| 2020-01-08 | ND | |
| 2020-01-08 | ND | |
| 2020-04-14 | ND | |
| 2020-04-14 | 0.730 ppb | |
| 2020-07-01 | 0.580 ppb | |
| 2020-07-01 | ND | |
| 2020-10-14 | ND | |
| 2020-10-14 | ND | |
| 2021-01-05 | 0.580 ppb | |
| 2021-01-05 | ND | |
| 2021-01-05 | ND | |
| 2021-01-05 | ND | |
| 2021-04-07 | 0.580 ppb | |
| 2021-04-07 | ND | |
| 2021-06-03 | ND | |
| 2021-07-07 | ND | |
| 2021-07-07 | 0.560 ppb | |
| 2021-10-05 | ND | |
| 2021-10-05 | ND | |
| 2022-01-10 | ND | |
| 2022-01-10 | ND | |
| 2022-01-10 | ND | |
| 2022-01-10 | ND | |
| 2022-04-06 | ND | |
| 2022-04-06 | 0.660 ppb | |
| 2022-07-13 | ND | |
| 2022-07-13 | 0.830 ppb | |
| 2022-10-05 | ND | |
| 2022-10-05 | ND | |
| 2023-01-11 | ND | |
| 2023-01-11 | ND | |
| 2023-01-11 | ND | |
| 2023-01-11 | ND | |
| 2023-04-05 | 0.550 ppb | |
| 2023-04-05 | ND | |
| 2023-07-05 | ND | |
| 2023-07-05 | ND | |
| 2023-10-04 | ND | |
| 2023-10-04 | ND |