trans-1,2-Dichloroethylene
Starr Water Supply Corporation
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 |
|---|---|---|
| 2018-10-04 | Q1839859004 | ND |
| 2018-10-04 | Q1839859005 | ND |
| 2018-10-04 | Q1839859007 | ND |
| 2018-10-04 | Q1839859002 | ND |
| 2019-08-27 | Q1960470001 | ND |
| 2019-08-27 | Q1960470003 | ND |
| 2019-08-27 | Q1960470005 | ND |
| 2019-12-11 | Q1979772001 | ND |
| 2020-09-29 | Q2038300011 | ND |
| 2020-09-29 | Q2038300014 | ND |
| 2020-09-29 | Q2038300016 | ND |
| 2020-12-15 | Q2049655005 | ND |
| 2021-05-19 | Q2113143005 | ND |
| 2021-09-09 | Q2124597001 | ND |
| 2021-11-17 | Q2132246001 | ND |
| 2021-11-17 | Q2132246006 | ND |
| 2021-11-17 | Q2132246008 | ND |
| 2022-10-19 | Q2231830002 | ND |
| 2022-10-19 | Q2231830004 | ND |
| 2022-10-19 | Q2231830006 | ND |
| 2022-10-19 | Q2231830008 | ND |
| 2023-06-26 | Q2324322005 | ND |
| 2023-06-26 | Q2324322007 | ND |
| 2023-06-26 | Q2324322009 | ND |
| 2023-06-26 | Q2324322011 | ND |