1,2,4-Trichlorobenzene
City of Billings
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 | 5 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 12 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2014-02-10 | B14020492-001F | ND |
| 2014-05-12 | B14051004-001A | ND |
| 2014-05-12 | B14051004-001 | ND |
| 2014-08-11 | B14081054-001D | ND |
| 2014-11-12 | B14110966-007A | ND |
| 2015-02-09 | B15020974-001D | ND |
| 2015-05-11 | B15051144-009A | ND |
| 2015-08-10 | B15080796-002A | ND |
| 2015-11-09 | B15110678-001A | ND |
| 2016-02-08 | B16020890-001D | ND |
| 2016-05-10 | B16051069-001A | ND |
| 2016-08-08 | B16081057-001A | ND |
| 2016-11-09 | B16110820-001A | ND |
| 2017-02-08 | B17020497-002D | ND |
| 2017-05-08 | B17051019-001D | ND |
| 2017-08-07 | B17081099-001D | ND |
| 2017-11-06 | B17110842-003A | ND |
| 2017-11-06 | B17110842-002A | ND |
| 2017-11-06 | B17110842-001A | ND |
| 2017-11-07 | B17110842-005A | ND |
| 2017-11-07 | B17110842-004A | ND |
| 2017-11-08 | B17110842-008A | ND |
| 2017-11-08 | B17110842-007A | ND |
| 2017-11-08 | B17110842-006A | ND |
| 2017-11-09 | B17110842-009A | ND |
| 2018-02-05 | B18020545-001F | ND |
| 2018-05-07 | B18051134-001F | ND |
| 2018-08-06 | B18080949-002E | ND |
| 2018-08-06 | B18080949-001F | ND |
| 2019-02-11 | B19020608-001F | ND |
| 2019-05-13 | B19051523-001A | ND |
| 2019-08-12 | B19081432-001A | ND |
| 2019-11-13 | B19111116-001A | ND |
| 2019-11-13 | B19111116-002A | ND |