trans-1,2-Dichloroethylene
Sierra Madre Water Department
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 | 5 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2014-05-12 | 9588-007-1125 | ND |
| 2014-05-12 | 9588-006-1055 | ND |
| 2014-05-12 | 9588-005-1105 | ND |
| 2014-05-12 | 9588-004-1045 | ND |
| 2014-05-12 | 9588-003-1030 | ND |
| 2015-05-13 | 9588-006-1020 | ND |
| 2015-05-13 | 9588-007-0840 | ND |
| 2015-05-13 | 9588-003-1115 | ND |
| 2015-05-13 | 9588-005-0940 | ND |
| 2015-05-13 | 9588-004-1000 | ND |
| 2016-05-03 | 9588-003-0815 | ND |
| 2016-05-03 | 9588-005-0830 | ND |
| 2016-05-03 | 9588-006-0900 | ND |
| 2016-05-03 | 9588-004-0845 | ND |
| 2016-05-03 | 9588-007-0920 | ND |
| 2017-05-03 | 9588-005-0930 | ND |
| 2017-05-03 | 9588-003-1030 | ND |
| 2017-05-03 | 9588-004-1045 | ND |
| 2017-05-03 | 9588-006-0940 | ND |
| 2017-05-03 | 9588-007-1010 | ND |
| 2018-05-03 | 9588-004-1110 | ND |
| 2018-05-03 | 9588-003-1100 | ND |
| 2018-05-03 | 9588-007-1050 | ND |
| 2018-05-03 | 9588-006-1040 | ND |
| 2018-05-03 | 9588-005-1030 | ND |
| 2019-05-08 | 9588-006-1015 | ND |
| 2019-05-08 | 9588-007-0940 | ND |
| 2019-05-08 | 9588-003-0950 | ND |
| 2019-05-08 | 9588-005-1000 | ND |
| 2019-05-08 | 9588-004-1010 | ND |