trans-1,2-Dichloroethylene
East Pasadena Water Company
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 | 0.106 ppb | 5 | 1 | ND - 0.530 ppb |
2015 | ND | 3 | 0 | ND |
2016 | ND | 3 | 0 | ND |
2017 | ND | 3 | 0 | ND |
2018 | ND | 7 | 0 | ND |
2019 | ND | 3 | 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 |
---|---|---|
2014-03-17 | 3761-004-0840 | 0.530 ppb |
2014-04-07 | 9588-012-1115 | ND |
2014-05-27 | 3761-012-0845 | ND |
2014-07-07 | 9588-005-1000 | ND |
2014-10-20 | 3761-004-1015 | ND |
2015-03-17 | 3761-004-0820 | ND |
2015-04-01 | 9588-012-0910 | ND |
2015-07-15 | 9588-005-1030 | ND |
2016-03-21 | 3761-004-0840 | ND |
2016-04-12 | 9588-012-1105 | ND |
2016-07-06 | 9588-005-1145 | ND |
2017-03-27 | 3761-004-0950 | ND |
2017-04-11 | 9588-012-1050 | ND |
2017-07-13 | 9588-005-1330 | ND |
2018-03-19 | 3761-005-0940 | ND |
2018-03-19 | 3761-012-0855 | ND |
2018-03-19 | 3761-004-1000 | ND |
2018-04-11 | 9588-012-1035 | ND |
2018-04-26 | 3761-004-0840 | ND |
2018-05-22 | 3761-004-1130 | ND |
2018-07-12 | 9588-005-1035 | ND |
2019-03-11 | 3761-004-0820 | ND |
2019-04-03 | 9588-012-1000 | ND |
2019-07-29 | 9588-005-1225 | ND |