cis-1,2-Dichloroethylene
City of Daly City
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.
10
Samples
0
Samples exceeding legal limit (MCL)
0
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 70 ppb
The legal limit for cis-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 |
|---|---|---|
| 2015-08-04 | 1610-010-1120 | ND |
| 2015-12-09 | 1610-013-0745 | ND |
| 2015-12-09 | 1610-013-1045 | ND |
| 2016-01-20 | 1610-004-1040 | ND |
| 2016-02-03 | 1610-010-1045 | ND |
| 2016-02-03 | 1610-011-0950 | ND |
| 2016-02-03 | 1610-013-0815 | ND |
| 2016-02-03 | 1610-018-1130 | ND |
| 2019-01-09 | 1610-010-0920 | ND |
| 2019-01-09 | 1610-018-0640 | ND |