trans-1,2-Dichloroethylene
Monrovia 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 |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 7 | 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 |
|---|---|---|
| 2014-07-07 | 9588-008-0925 | ND |
| 2014-07-07 | 9588-005-0930 | ND |
| 2014-07-07 | 9588-004-0940 | ND |
| 2014-07-07 | 9588-003-0900 | ND |
| 2014-07-07 | 9588-002-0910 | ND |
| 2015-07-15 | 9588-005-0910 | ND |
| 2015-07-15 | 9588-008-0945 | ND |
| 2015-07-15 | 9588-002-0955 | ND |
| 2015-07-15 | 9588-004-0920 | ND |
| 2015-07-15 | 9588-003-0930 | ND |
| 2016-07-13 | 9588-002-0920 | ND |
| 2016-07-13 | 9588-008-0905 | ND |
| 2016-07-13 | 9588-005-0930 | ND |
| 2016-07-13 | 9588-003-0910 | ND |
| 2016-12-19 | 9588-004-0905 | ND |
| 2017-08-07 | 9588-005-0940 | ND |
| 2017-08-07 | 9588-008-1000 | ND |
| 2017-08-07 | 9588-002-0950 | ND |
| 2017-08-07 | 9588-003-0905 | ND |
| 2017-10-17 | 9588-004-0920 | ND |
| 2018-04-10 | 9588-008-0920 | ND |
| 2018-04-10 | 9588-002-0850 | ND |
| 2018-07-12 | 9588-005-0925 | ND |
| 2018-07-12 | 9588-003-0915 | ND |
| 2018-07-12 | 9588-008-0905 | ND |
| 2018-07-12 | 9588-002-0950 | ND |
| 2018-10-03 | 9588-004-0945 | ND |
| 2019-07-16 | 9588-005-1035 | ND |
| 2019-07-16 | 9588-002-1055 | ND |
| 2019-07-16 | 9588-008-1115 | ND |
| 2019-07-16 | 9588-003-1105 | ND |
| 2019-10-21 | 9588-004-0825 | ND |