1,1,1,2-Tetrachloroethane
Watertown Town Water District 3 & 4
NOTE: Watertown Town Water District 3 & 4 purchases water from Watertown City which is required to test for 1,1,1,2-tetrachloroethane. Sample information shown below was taken by Watertown City.
1,1,1,2-Tetrachloroethane is a synthetic chemical used in metal degreasing and as an intermediate in industrial chemical production.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 1 ppb
The EWG Health Guideline of 1 ppb for 1,1,1,2-tetrachloroethane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
NOTE: Watertown Town Water District 3 & 4 purchases water from Watertown City which is required to test for 1,1,1,2-tetrachloroethane. Sample information shown below was taken by Watertown City.
| Date | Lab ID | Result |
|---|---|---|
| 2019-07-10 | 1910987-001 | ND |
| 2020-07-09 | 2010531-001AB | ND |
| 2021-07-21 | 2111886-001 | ND |
| 2022-07-07 | 2210345-001 | ND |
| 2023-07-06 | 2309810-001 | ND |