trans-1,2-Dichloroethylene
Golden State Water Company (GSWC) - Norwalk
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 7 | 0 | ND |
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-02-04 | 2706-010-1225 | ND |
| 2014-02-04 | 2706-016-0900 | ND |
| 2014-05-06 | 2706-016-1028 | ND |
| 2014-08-06 | 2706-016-0940 | ND |
| 2014-11-04 | 2706-016-1054 | ND |
| 2015-02-02 | 2706-010-1023 | ND |
| 2015-02-03 | 2706-016-1152 | ND |
| 2015-05-07 | 2706-016-1358 | ND |
| 2015-08-04 | 2706-016-0821 | ND |
| 2015-11-04 | 2706-016-1304 | ND |
| 2016-05-02 | 2706-028-1147 | ND |
| 2016-05-02 | 2706-032-0751 | ND |
| 2016-05-04 | 2706-016-0921 | ND |
| 2016-05-04 | 2706-016-0910 | ND |
| 2016-08-02 | 2706-016-1146 | ND |
| 2016-11-08 | 2706-016-1303 | ND |
| 2017-01-03 | 9590-016-1315 | ND |
| 2017-02-09 | 9590-010-1025 | ND |
| 2017-02-13 | 9590-016-0850 | ND |
| 2017-02-27 | 9590-028-1013 | ND |
| 2017-05-03 | 9590-016-0920 | ND |
| 2017-08-01 | 9590-016-1029 | ND |
| 2017-11-09 | 9590-016-1103 | ND |
| 2018-02-08 | 9590-016-1401 | ND |
| 2018-02-12 | 9590-010-1230 | ND |
| 2018-03-07 | 9590-028-1338 | ND |
| 2018-03-07 | 9590-016-1407 | ND |
| 2018-03-07 | 9590-032-1304 | ND |
| 2018-05-02 | 9590-016-1147 | ND |
| 2018-09-12 | 9590-016-1156 | ND |
| 2018-11-06 | 9590-016-1203 | ND |
| 2019-02-11 | 9590-032-1330 | ND |
| 2019-02-11 | 9590-016-1054 | ND |
| 2019-02-12 | 9590-028-1333 | ND |
| 2019-05-08 | 9590-016-1140 | ND |
| 2019-08-06 | 9590-032-1220 | ND |
| 2019-11-06 | 9590-032-1235 | ND |