1,2,4-Trichlorobenzene
City of San Diego
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 | 11 | 0 | ND |
| 2016 | ND | 12 | 0 | ND |
| 2017 | ND | 9 | 0 | ND |
| 2018 | ND | 16 | 0 | ND |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-02-05 | 9437-010-0000 | ND |
| 2014-02-05 | 9437-006-0000 | ND |
| 2014-02-05 | 9437-001-0000 | ND |
| 2014-05-07 | 9437-010-0000 | ND |
| 2014-05-07 | 9437-006-0000 | ND |
| 2014-05-07 | 9437-001-0000 | ND |
| 2014-11-05 | 9437-010-0000 | ND |
| 2014-11-05 | 9437-006-0000 | ND |
| 2014-11-05 | 9437-001-0000 | ND |
| 2015-02-04 | 9437-001-0000 | ND |
| 2015-02-04 | 9437-010-0000 | ND |
| 2015-05-06 | 9437-001-0000 | ND |
| 2015-05-06 | 9437-010-0000 | ND |
| 2015-05-06 | 9437-006-0000 | ND |
| 2015-08-05 | 9437-001-0000 | ND |
| 2015-08-05 | 9437-006-0000 | ND |
| 2015-08-05 | 9437-010-0000 | ND |
| 2015-11-18 | 9437-001-0000 | ND |
| 2015-11-18 | 9437-006-0000 | ND |
| 2015-11-18 | 9437-010-0000 | ND |
| 2016-02-08 | 9437-001-0000 | ND |
| 2016-02-08 | 9437-006-0000 | ND |
| 2016-02-08 | 9437-010-0000 | ND |
| 2016-05-04 | 9437-010-0000 | ND |
| 2016-05-04 | 9437-001-0000 | ND |
| 2016-05-04 | 9437-006-0000 | ND |
| 2016-08-04 | 9437-001-0000 | ND |
| 2016-08-04 | 9437-010-0000 | ND |
| 2016-08-04 | 9437-006-0000 | ND |
| 2016-11-02 | 9437-001-0000 | ND |
| 2016-11-02 | 9437-010-0000 | ND |
| 2016-11-02 | 9437-006-0000 | ND |
| 2017-02-01 | 9437-001-0000 | ND |
| 2017-02-01 | 9437-010-0000 | ND |
| 2017-02-01 | 9437-006-0000 | ND |
| 2017-05-03 | 9437-006-0000 | ND |
| 2017-05-03 | 9437-010-0000 | ND |
| 2017-05-03 | 9437-001-0000 | ND |
| 2017-11-01 | 9437-010-0000 | ND |
| 2017-11-01 | 9437-001-0000 | ND |
| 2017-11-01 | 9437-006-0000 | ND |
| 2018-02-07 | 9437-010-0000 | ND |
| 2018-02-07 | 9437-030-0000 | ND |
| 2018-02-07 | 9437-001-0000 | ND |
| 2018-02-07 | 9437-006-0000 | ND |
| 2018-05-09 | 9437-030-0000 | ND |
| 2018-05-21 | 9437-010-0000 | ND |
| 2018-05-21 | 9437-006-0000 | ND |
| 2018-05-21 | 9437-001-0000 | ND |
| 2018-08-01 | 9437-010-0000 | ND |
| 2018-08-01 | 9437-001-0000 | ND |
| 2018-08-01 | 9437-006-0000 | ND |
| 2018-09-05 | 9437-030-0000 | ND |
| 2018-11-14 | 9437-030-0000 | ND |
| 2018-11-14 | 9437-006-0000 | ND |
| 2018-11-14 | 9437-001-0000 | ND |
| 2018-11-14 | 9437-010-0000 | ND |
| 2019-05-08 | 9437-006-0000 | ND |
| 2019-05-08 | 9437-010-0000 | ND |
| 2019-05-08 | 9437-001-0000 | ND |
| 2019-08-07 | 9437-006-0000 | ND |
| 2019-08-07 | 9437-010-0000 | ND |
| 2019-08-07 | 9437-001-0000 | ND |