trans-1,2-Dichloroethylene
Golden State Water Company (GSWC) - Claremont
NOTE: Golden State Water Company (GSWC) - Claremont purchases water from Three Valleys Municipal Water District which is required to test for trans-1,2-dichloroethylene. Sample information shown below was taken by Three Valleys Municipal Water 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 | 37 | 0 | ND |
| 2019 | ND | 54 | 0 | ND |
| 2020 | ND | 44 | 0 | ND |
| 2021 | ND | 64 | 0 | ND |
| 2022 | ND | 42 | 0 | ND |
| 2023 | ND | 44 | 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
NOTE: Golden State Water Company (GSWC) - Claremont purchases water from Three Valleys Municipal Water District which is required to test for trans-1,2-dichloroethylene. Sample information shown below was taken by Three Valleys Municipal Water District.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-20 | CA1910041_005_005-201803200903 | ND |
| 2018-03-20 | CA1910041_004_004-201803200900 | ND |
| 2018-08-21 | CA1910041_001_001-201808210905 | ND |
| 2018-08-21 | CA1910041_002_002-201808210910 | ND |
| 2019-04-16 | CA1910041_005_005-201904160904 | ND |
| 2019-04-16 | CA1910041_004_004-201904160910 | ND |
| 2019-07-16 | CA1910041_002_002-201907160730 | ND |
| 2019-07-16 | CA1910041_001_001-201907160740 | ND |
| 2020-03-31 | CA1910041_004_004-20200331NUL | ND |
| 2020-03-31 | CA1910041_005_005-20200331NUL | ND |
| 2020-07-09 | CA1910041_007_007-202007090800 | ND |
| 2020-07-21 | CA1910041_001_001-202007210840 | ND |
| 2020-07-21 | CA1910041_002_002-202007210845 | ND |
| 2020-09-15 | CA1910041_005_005-202009150935 | ND |
| 2020-09-15 | CA1910041_004_004-202009150930 | ND |
| 2020-12-08 | CA1910041_009_009-202012080356 | ND |
| 2021-03-16 | CA1910041_005_005-202103160945 | ND |
| 2021-03-16 | CA1910041_007_007-202103160930 | ND |
| 2021-03-16 | CA1910041_001_001-202103160830 | ND |
| 2021-09-21 | CA1910041_004_004-202109210720 | ND |
| 2022-04-19 | CA1910041_004_004-202204190840 | ND |
| 2022-04-19 | CA1910041_007_007-202204191030 | ND |
| 2022-04-19 | CA1910041_005_005-202204190830 | ND |
| 2023-02-02 | CA1910041_009_009-202302021000 | ND |
| 2023-03-15 | CA1910041_005_005-202303150910 | ND |
| 2023-03-15 | CA1910041_001_001-202303150800 | ND |
| 2023-03-15 | CA1910041_002_002-202303150815 | ND |
| 2023-04-18 | CA1910041_007_007-202304180830 | ND |
| 2023-04-18 | CA1910041_004_004-202304180900 | ND |
| 2023-07-19 | CA1910041_009_009-202307191030 | ND |
| 2023-10-24 | CA1910041_009_009-202310240900 | ND |