1,2,4-Trichlorobenzene
Coastside County Water District
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 | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-03-17 | 5810-011-1040 | ND |
| 2014-03-19 | 5810-010-1130 | ND |
| 2015-03-04 | 5810-010-1015 | ND |
| 2015-03-10 | 5810-011-1030 | ND |
| 2015-03-25 | 5810-002-1015 | ND |
| 2015-12-16 | 5810-013-1200 | ND |
| 2016-02-02 | 5810-011-1020 | ND |
| 2016-03-30 | 5810-010-0950 | ND |
| 2017-02-14 | 5810-011-1030 | ND |
| 2017-03-15 | 5810-010-1115 | ND |
| 2018-02-20 | 5810-011-1425 | ND |
| 2018-03-14 | 5810-002-1028 | ND |
| 2018-03-14 | 5810-010-1110 | ND |
| 2019-02-19 | 5810-011-1025 | ND |
| 2019-03-13 | 5810-010-1135 | ND |