1,1,1,2-Tetrachloroethane
San Lorenzo Valley Water District
1,1,1,2-Tetrachloroethane is a synthetic chemical used in metal degreasing and as an intermediate in industrial chemical production.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 5 | 0 | ND |
2015 | ND | 9 | 0 | ND |
2016 | ND | 1 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 6 | 0 | ND |
2019 | ND | 1 | 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 |
---|---|---|
2014-03-19 | 9590-034-1300 | ND |
2014-05-21 | 9590-034-1530 | ND |
2014-08-27 | 9590-034-1140 | ND |
2014-09-10 | 9590-025-1100 | ND |
2014-11-18 | 9590-034-1200 | ND |
2015-02-10 | 9590-034-1130 | ND |
2015-05-20 | 9590-034-1445 | ND |
2015-08-05 | 9590-023-1430 | ND |
2015-08-05 | 9590-024-1500 | ND |
2015-08-05 | 9590-034-1445 | ND |
2015-08-19 | 9590-010-1400 | ND |
2015-08-19 | 9590-026-1500 | ND |
2015-08-19 | 9590-025-1445 | ND |
2015-08-19 | 9590-022-1415 | ND |
2016-07-14 | 9590-025-1055 | ND |
2017-07-11 | 9590-025-0845 | ND |
2017-08-02 | 9590-025-0900 | ND |
2018-07-05 | 9590-025-1030 | ND |
2018-07-05 | 9590-026-1000 | ND |
2018-07-05 | 9590-034-0915 | ND |
2018-07-18 | 9590-010-1030 | ND |
2018-07-18 | 9590-022-1045 | ND |
2018-08-14 | 9590-024-0830 | ND |
2019-12-12 | 9590-025-0940 | ND |