1,2,4-Trichlorobenzene
City of Post Falls
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 | 9 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 7 | 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 |
|---|---|---|
| 2014-01-27 | V012714105 | ND |
| 2014-01-27 | V012714104 | ND |
| 2014-03-21 | V149079 | ND |
| 2014-06-02 | V060214129 | ND |
| 2014-06-02 | V060214105 | ND |
| 2014-06-02 | V060214103 | ND |
| 2014-06-02 | V060214104 | ND |
| 2014-06-24 | V151797 | ND |
| 2014-09-04 | V154278 | ND |
| 2015-09-14 | V164591 | ND |
| 2016-12-14 | V178367 | ND |
| 2019-11-12 | V210892 | ND |
| 2019-11-13 | V210942 | ND |
| 2019-11-18 | V211060 | ND |
| 2019-11-18 | V211063 | ND |
| 2019-11-19 | V211104 | ND |
| 2019-12-09 | V211717 | ND |
| 2019-12-16 | V211918 | ND |