trans-1,2-Dichloroethylene
Hydro Public Works Authority
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 1 | 0 | ND |
2015 | 1.30 ppb | 8 | 2 | ND - 5.70 ppb |
2016 | ND | 5 | 0 | ND |
2017 | ND | 5 | 0 | ND |
2018 | ND | 5 | 0 | ND |
2019 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-01-23 | 039216.001 | ND |
2015-01-20 | 052796.001 | ND |
2015-09-18 | 063290.007 | ND |
2015-09-18 | 063290.006 | ND |
2015-09-18 | 063290.005 | ND |
2015-09-18 | 063290.004 | 5.70 ppb |
2015-09-18 | 063290.003 | 4.70 ppb |
2015-09-18 | 063290.002 | ND |
2015-09-18 | 063290.001 | ND |
2016-07-08 | SDWA-1044817-00 | ND |
2016-07-08 | SDWA-1044835-00 | ND |
2016-07-08 | SDWA-1044823-00 | ND |
2016-07-08 | SDWA-1044811-00 | ND |
2016-07-08 | SDWA-1044798-00 | ND |
2017-05-08 | SDWA-1144632-00 | ND |
2017-05-08 | SDWA-1144624-00 | ND |
2017-05-08 | SDWA-1144615-03 | ND |
2017-06-29 | SDWA-1168943-00 | ND |
2017-06-29 | SDWA-1168942-00 | ND |
2018-02-09 | SDWA-1237518-00 | ND |
2018-02-09 | SDWA-1237541-00 | ND |
2018-02-09 | SDWA-1237535-00 | ND |
2018-02-09 | SDWA-1237529-00 | ND |
2018-02-09 | SDWA-1237523-00 | ND |