cis-1,2-Dichloroethylene
Black Eagle Cascade County Water Sewer
NOTE: Black Eagle Cascade County Water Sewer purchases water from City of Great Falls which is required to test for cis-1,2-dichloroethylene. Sample information shown below was taken by City of Great Falls.
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 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
NOTE: Black Eagle Cascade County Water Sewer purchases water from City of Great Falls which is required to test for cis-1,2-dichloroethylene. Sample information shown below was taken by City of Great Falls.
| Date | Lab ID | Result |
|---|---|---|
| 2014-05-05 | B14050434-001C | ND |
| 2014-08-05 | B14080466-001C | ND |
| 2015-06-02 | B15060379-001B | ND |
| 2016-06-13 | B16061189-001A | ND |
| 2017-06-06 | B17060662-001A | ND |
| 2018-01-24 | B18011760-001F | ND |
| 2019-02-11 | B19020678-001F | ND |