1,2,4-Trichlorobenzene
Concord Water Department
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 | 4 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-10-31 | 137495.02 | ND |
| 2014-10-31 | 137495.03 | ND |
| 2014-10-31 | 137495.04 | ND |
| 2014-10-31 | 137495.01 | ND |
| 2015-08-07 | 146612.01 | ND |
| 2015-10-15 | 149110.01 | ND |
| 2015-10-15 | 149110.02 | ND |
| 2015-10-15 | 149110.03 | ND |
| 2015-10-15 | 149110.04 | ND |
| 2016-08-05 | 159131.01 | ND |
| 2016-10-07 | 161374.02 | ND |
| 2016-10-07 | 161374.03 | ND |
| 2016-10-07 | 161374.04 | ND |
| 2016-10-07 | 161374.05 | ND |
| 2017-11-13 | 175839.02 | ND |
| 2017-11-13 | 175839.05 | ND |
| 2017-11-13 | 175839.04 | ND |
| 2017-11-13 | 175839.03 | ND |
| 2018-07-02 | 183690.01 | ND |
| 2018-10-01 | 187223.01 | ND |
| 2018-10-01 | 187223.02 | ND |
| 2018-10-01 | 187223.03 | ND |
| 2018-10-01 | 187223.04 | ND |
| 2019-07-01 | 197248.01 | ND |
| 2019-10-03 | 201192.02 | ND |
| 2019-10-03 | 201192.03 | ND |
| 2019-10-03 | 201192.04 | ND |
| 2019-10-03 | 201192.05 | ND |