trans-1,2-Dichloroethylene
City Of Modesto - Del Rio
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 | 3 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-03-07 | CA5010029_004_004-201803070850 | ND |
| 2018-03-07 | CA5010029_002_002-201803070810 | ND |
| 2018-05-14 | CA5010029_010_010-201805140830 | ND |
| 2020-03-04 | CA5010029_001_001-202003041300 | ND |
| 2020-05-13 | CA5010029_010_010-202005131047 | ND |
| 2021-01-06 | CA5010029_010_010-202101060800 | ND |
| 2021-03-03 | CA5010029_002_002-202103031243 | ND |
| 2021-03-03 | CA5010029_004_004-202103031320 | ND |
| 2021-04-07 | CA5010029_010_010-202104070815 | ND |
| 2021-07-06 | CA5010029_010_010-202107061040 | ND |
| 2021-10-06 | CA5010029_010_010-202110060810 | ND |
| 2023-03-01 | CA5010029_001_001-202303010830 | ND |
| 2023-06-07 | CA5010029_010_010-202306070910 | ND |