1,1,1,2-Tetrachloroethane
City of Napa
1,1,1,2-Tetrachloroethane is a synthetic chemical used in metal degreasing and as an intermediate in industrial chemical production.
15
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 | ND | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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
| Date | Lab ID | Result |
|---|---|---|
| 2014-07-09 | 1233-005-1145 | ND |
| 2014-07-09 | 1233-006-1245 | ND |
| 2014-07-09 | 1233-007-0925 | ND |
| 2015-07-21 | 1233-005-1120 | ND |
| 2015-07-21 | 1233-006-1415 | ND |
| 2015-07-21 | 1233-007-0940 | ND |
| 2016-07-27 | 1233-006-1545 | ND |
| 2016-07-27 | 1233-007-1245 | ND |
| 2017-07-20 | 1233-006-1330 | ND |
| 2017-07-20 | 1233-007-1050 | ND |
| 2017-09-13 | 1233-005-0840 | ND |
| 2018-07-11 | 1233-006-1015 | ND |
| 2018-07-11 | 1233-007-1200 | ND |
| 2019-07-10 | 1233-006-1200 | ND |
| 2019-07-10 | 1233-007-0830 | ND |