1,2,4-Trichlorobenzene
Colby Waterworks
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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-08-13 | 810326 | ND |
| 2014-08-13 | 810323 | ND |
| 2014-10-24 | 827642 | ND |
| 2015-08-25 | 878740 | ND |
| 2015-11-17 | 894440 | ND |
| 2016-03-08 | 909005 | ND |
| 2016-05-10 | 920384 | ND |
| 2016-09-20 | 946837 | ND |
| 2017-09-12 | 1017662 | ND |
| 2017-09-12 | 1017665 | ND |
| 2018-06-04 | 1058548 | ND |
| 2019-09-09 | 1146072 | ND |
| 2019-09-18 | 1149297 | ND |