1,2,4-Trichlorobenzene
City of Lewiston
1,2,4-Trichlorobenzene is an industrial solvent that can harm the adrenal glands and may increase the risk of cancer.
Samples
Samples exceeding legal limit (MCL)
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 | 1 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 5 ppb
The EWG Health Guideline of 5 ppb for 1,2,4-trichlorobenzene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hormone disruption.
EPA Maximum Contaminant
Level (MCL) 70 ppb
The legal limit for 1,2,4-trichlorobenzene, established in 1992, was based on a toxicity study in laboratory animals conducted in 1981. This limit may not fully protect against hormone disruption.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-25 | V140226039-001 | ND |
| 2014-06-03 | V140604041-002 | ND |
| 2014-08-13 | V140814054-004 | ND |
| 2015-01-21 | V150122025-001 | ND |
| 2015-04-14 | V150416021-001 | ND |
| 2015-07-22 | V150723044-003 | ND |
| 2016-02-09 | V160209050-002 | ND |
| 2017-03-28 | V170328050-002 | ND |
| 2017-03-28 | V170328050-001 | ND |
| 2017-09-19 | V170920029-004 | ND |
| 2017-09-19 | V170920029-003 | ND |
| 2018-02-21 | V180221045-001 | ND |
| 2018-02-22 | V180223004-001 | ND |
| 2018-12-13 | V181213011-001 | ND |
| 2018-12-13 | V181213011-002 | ND |
| 2019-01-24 | V190124017-001 | ND |
| 2019-04-23 | V190423067-002 | ND |
| 2019-04-23 | V190423067-001 | ND |
| 2019-08-14 | V190814075-003 | ND |