trans-1,2-Dichloroethylene
Two Way Special Utility District
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 | 6 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 6 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-06-25 | Q1825251009 | ND |
| 2018-06-25 | Q1825251011 | ND |
| 2018-06-25 | Q1825251014 | ND |
| 2018-06-25 | Q1825251017 | ND |
| 2018-06-25 | Q1825251024 | ND |
| 2018-06-25 | Q1825251008 | ND |
| 2019-10-14 | Q1972459011 | ND |
| 2019-10-14 | Q1972459009 | ND |
| 2019-10-14 | Q1972459007 | ND |
| 2019-10-14 | Q1972459005 | ND |
| 2019-10-14 | Q1972459003 | ND |
| 2019-12-11 | Q1979771004 | ND |
| 2020-08-25 | Q2034116003 | ND |
| 2020-10-12 | Q2039772007 | ND |
| 2020-10-12 | Q2039772009 | ND |
| 2020-10-12 | Q2039772011 | ND |
| 2020-10-12 | Q2039772013 | ND |
| 2021-11-09 | Q2131341012 | ND |
| 2021-11-09 | Q2131341022 | ND |
| 2021-11-09 | Q2131341020 | ND |
| 2021-11-09 | Q2131341018 | ND |
| 2021-11-09 | Q2131341016 | ND |
| 2021-11-09 | Q2131341014 | ND |
| 2022-10-11 | Q2230663004 | ND |
| 2022-10-11 | Q2230663006 | ND |
| 2022-10-11 | Q2230663008 | ND |
| 2022-10-11 | Q2230663012 | ND |
| 2022-10-11 | Q2230663014 | ND |
| 2022-12-06 | Q2236335001 | ND |
| 2023-07-24 | Q2329218001 | ND |
| 2023-10-31 | Q2346526005 | ND |
| 2023-10-31 | Q2346526007 | ND |
| 2023-10-31 | Q2346526009 | ND |
| 2023-10-31 | Q2346526011 | ND |