trans-1,2-Dichloroethylene
California Water Service Company Oak Hills
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 | 5 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 5 | 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 |
|---|---|---|
| 2018-03-14 | CA2710019_008_008-201803141248 | ND |
| 2018-06-20 | CA2710019_008_008-201806200940 | ND |
| 2018-09-25 | CA2710019_008_008-201809251226 | ND |
| 2018-09-25 | CA2710019_003_003-201809251256 | ND |
| 2018-12-12 | CA2710019_008_008-201812121546 | ND |
| 2019-06-19 | CA2710019_008_008-201906191332 | ND |
| 2019-09-17 | CA2710019_008_008-201909171201 | ND |
| 2019-12-19 | CA2710019_008_008-201912191054 | ND |
| 2020-03-17 | CA2710019_008_008-202003171219 | ND |
| 2020-05-19 | CA2710019_008_008-202005190920 | ND |
| 2020-09-24 | CA2710019_008_008-202009241029 | ND |
| 2020-12-15 | CA2710019_008_008-202012151046 | ND |
| 2021-03-09 | CA2710019_008_008-202103091038 | ND |
| 2021-06-29 | CA2710019_001_001-202106291348 | ND |
| 2021-06-29 | CA2710019_008_008-202106291156 | ND |
| 2021-09-14 | CA2710019_003_003-202109140935 | ND |
| 2021-09-14 | CA2710019_008_008-202109140956 | ND |
| 2021-12-15 | CA2710019_008_008-202112150944 | ND |
| 2022-02-22 | CA2710019_008_008-202202220909 | ND |
| 2022-03-10 | CA2710019_008_008-202203101116 | ND |
| 2022-06-22 | CA2710019_008_008-202206221330 | ND |
| 2022-09-01 | CA2710019_008_008-202209011120 | ND |
| 2022-12-08 | CA2710019_008_008-202212081046 | ND |
| 2023-03-28 | CA2710019_008_008-202303281435 | ND |
| 2023-06-26 | CA2710019_008_008-202306261250 | ND |
| 2023-09-21 | CA2710019_008_008-202309210921 | ND |
| 2023-12-28 | CA2710019_008_008-202312280955 | ND |