trans-1,2-Dichloroethylene
Upper Hanover Water Authority
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 | 5 | 0 | ND |
| 2020 | ND | 9 | 0 | ND |
| 2021 | ND | 10 | 0 | ND |
| 2022 | ND | 13 | 0 | ND |
| 2023 | ND | 7 | 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 |
|---|---|---|
| 2018-01-30 | 8001978-01 | ND |
| 2018-04-25 | 8008140-01 | ND |
| 2018-07-17 | 8017906-01 | ND |
| 2018-07-25 | 8019752-01 | ND |
| 2018-07-25 | 8019752-02 | ND |
| 2018-10-10 | 8028641-01 | ND |
| 2019-01-23 | 8038660-01 | ND |
| 2019-05-07 | 9009685-01 | ND |
| 2019-08-21 | 8038658-01 | ND |
| 2019-09-24 | 9034252-01 | ND |
| 2019-12-11 | 9033962-01 | ND |
| 2020-03-18 | 21847897.00 | ND |
| 2020-03-20 | 21847930.00 | ND |
| 2020-03-20 | 21847929.00 | ND |
| 2020-04-28 | 22024171.00 | ND |
| 2020-04-28 | 22024170.00 | ND |
| 2020-06-24 | 22417305.00 | ND |
| 2020-07-01 | 22417306.00 | ND |
| 2020-10-06 | 23183412.00 | ND |
| 2020-11-20 | 23362969.00 | ND |
| 2021-03-16 | 24061098.00 | ND |
| 2021-03-19 | 24061099.00 | ND |
| 2021-04-21 | 24248446.00 | ND |
| 2021-04-30 | 24248598.00 | ND |
| 2021-07-06 | 24829857.00 | ND |
| 2021-07-09 | 24830010.00 | ND |
| 2021-10-05 | 25405591.00 | ND |
| 2021-10-29 | 25405748.00 | ND |
| 2021-12-29 | 25765026.00 | ND |
| 2021-12-29 | 25765005.00 | ND |
| 2022-02-01 | 25943619.00 | ND |
| 2022-02-01 | 25943618.00 | ND |
| 2022-02-01 | 25943620.00 | ND |
| 2022-02-23 | 26118547.00 | ND |
| 2022-02-23 | 26118548.00 | ND |
| 2022-05-05 | 26649366.00 | ND |
| 2022-05-06 | 26649367.00 | ND |
| 2022-06-02 | 26649544.00 | ND |
| 2022-06-03 | 26649545.00 | ND |
| 2022-07-07 | 27037985.00 | ND |
| 2022-07-08 | 27037986.00 | ND |
| 2022-12-01 | 27999414.00 | ND |
| 2022-12-02 | 27999415.00 | ND |
| 2023-01-04 | 28173530.00 | ND |
| 2023-04-10 | 28703166.00 | ND |
| 2023-04-11 | 28703165.00 | ND |
| 2023-04-11 | 28703164.00 | ND |
| 2023-07-03 | 29302591.00 | ND |
| 2023-10-03 | 29700865.00 | ND |
| 2023-11-28 | 30246502.00 | ND |