trans-1,2-Dichloroethylene
Western Hills Water System
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-09-18 | AE40735 | ND |
| 2018-09-18 | AE40745 | ND |
| 2018-09-18 | AE40749 | ND |
| 2018-09-18 | AE40729 | ND |
| 2019-06-17 | AE71090 | ND |
| 2019-06-17 | AE71098 | ND |
| 2019-06-17 | AE71118 | ND |
| 2019-06-17 | AE71138 | ND |
| 2020-06-15 | AF15206 | ND |
| 2020-06-15 | AF15208 | ND |
| 2020-06-15 | AF15210 | ND |
| 2020-06-15 | AF15214 | ND |
| 2021-08-03 | AF64447 | ND |
| 2021-08-03 | AF64455 | ND |
| 2021-08-03 | AF64451 | ND |
| 2021-09-23 | AF71029 | ND |
| 2021-10-14 | AF73603 | ND |
| 2022-03-22 | AF90050 | ND |
| 2022-03-22 | AF90052 | ND |
| 2022-03-22 | AF90054 | ND |
| 2022-10-04 | AG15920 | ND |
| 2023-07-12 | AG48162 | ND |
| 2023-07-12 | AG48172 | ND |
| 2023-07-12 | AG48178 | ND |
| 2023-07-12 | AG48180 | ND |