1,1,1-Trichloroethane
Northwest Harris County Municipal Utility District 23
1,1,1-Trichloroethane is a solvent and a degreasing agent used for manufacturing metal products and as ingredient in cleaners and aerosols. Exposure to 1,1,1-trichloroethane can harm the nervous system, liver and circulatory system.
20
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 |
|---|---|---|---|---|
| 2014 | ND | 1 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 200 ppb
The legal limit for 1,1,1-trichloroethane, established in 1987, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-30 | AC52362 | ND |
| 2015-02-12 | AC80441 | ND |
| 2015-05-05 | AC90544 | ND |
| 2015-09-03 | AD05660 | ND |
| 2015-11-12 | AD13388 | ND |
| 2016-02-04 | AD22165 | ND |
| 2016-04-28 | AD34644 | ND |
| 2016-09-22 | AD50823 | ND |
| 2016-11-08 | AD57113 | ND |
| 2017-01-12 | AD64732 | ND |
| 2017-04-12 | AD79463 | ND |
| 2017-07-13 | AD89325 | ND |
| 2017-10-17 | AE01089 | ND |
| 2018-01-11 | AE08956 | ND |
| 2018-05-17 | AE26815 | ND |
| 2018-07-12 | AE33153 | ND |
| 2018-10-09 | AE42952 | ND |
| 2019-01-31 | AE52467 | ND |
| 2019-09-25 | AE84642 | ND |
| 2019-11-07 | AE88933 | ND |