1,2,4-Trichlorobenzene
City of Ripon
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 4 | 0 | ND |
| 2016 | 1.03 ppb | 3 | 1 | ND - 3.10 ppb |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2015-06-08 | 2625-003-1138 | ND |
| 2015-06-08 | 2625-007-0955 | ND |
| 2015-06-08 | 2625-022-1030 | ND |
| 2015-07-08 | 2625-024-0955 | ND |
| 2016-06-15 | 2625-003-0800 | ND |
| 2016-06-15 | 2625-010-0820 | ND |
| 2016-10-20 | 2625-020-1045 | 3.10 ppb |
| 2017-06-14 | 2625-010-0930 | ND |
| 2017-10-24 | 2625-020-1020 | ND |
| 2018-06-12 | 2625-003-1015 | ND |
| 2018-06-12 | 2625-007-0945 | ND |
| 2018-07-10 | 5810-024-0910 | ND |
| 2019-06-11 | 5810-003-0806 | ND |