cis-1,2-Dichloroethylene
Quarryville Borough
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.
24
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 |
|---|---|---|---|---|
| 2018 | ND | 4 | 0 | ND |
| 2019 | 0.400 ppb | 4 | 2 | ND - 0.900 ppb |
| 2020 | 1.15 ppb | 4 | 4 | 0.900 ppb - 1.40 ppb |
| 2021 | 1.30 ppb | 4 | 4 | 1.20 ppb - 1.40 ppb |
| 2022 | 1.38 ppb | 4 | 4 | 1.20 ppb - 1.70 ppb |
| 2023 | 1.73 ppb | 4 | 4 | 1.60 ppb - 1.90 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-01-11 | 7121162-01 | ND |
| 2018-04-09 | 8032882-01 | ND |
| 2018-07-10 | 8062555-01 | ND |
| 2018-10-11 | 8093465-01 | ND |
| 2019-01-10 | 8123550-01 | ND |
| 2019-04-11 | 9032840-01 | ND |
| 2019-07-09 | 9063178-01 | 0.700 ppb |
| 2019-10-10 | 9093307-01 | 0.900 ppb |
| 2020-01-09 | 21629897.00 | 0.900 ppb |
| 2020-04-09 | 22171733.00 | 1.000 ppb |
| 2020-07-09 | 22756540.00 | 1.30 ppb |
| 2020-10-08 | 23322627.00 | 1.40 ppb |
| 2021-01-07 | 23849727.00 | 1.40 ppb |
| 2021-04-08 | 24393725.00 | 1.40 ppb |
| 2021-07-08 | 24979074.00 | 1.20 ppb |
| 2021-10-07 | 25548433.00 | 1.20 ppb |
| 2022-01-06 | 26080265.00 | 1.20 ppb |
| 2022-04-07 | 26607608.00 | 1.30 ppb |
| 2022-07-07 | 27191785.00 | 1.70 ppb |
| 2022-10-06 | 27785630.00 | 1.30 ppb |
| 2023-01-12 | 28310292.00 | 1.60 ppb |
| 2023-04-06 | 28858406.00 | 1.80 ppb |
| 2023-07-06 | 29454455.00 | 1.90 ppb |
| 2023-10-12 | 30031358.00 | 1.60 ppb |