1,2,4-Trichlorobenzene
La Habra Heights 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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-01-08 | 9588-009-0929 | ND |
| 2014-04-11 | 9588-010-0930 | ND |
| 2014-07-22 | 9588-005-0950 | ND |
| 2015-03-04 | 9588-009-0928 | ND |
| 2015-04-10 | 9588-010-0920 | ND |
| 2015-07-28 | 9588-005-0947 | ND |
| 2015-09-16 | 9588-006-1010 | ND |
| 2016-03-21 | 9588-009-0940 | ND |
| 2016-07-13 | 9588-005-0907 | ND |
| 2016-07-13 | 9588-010-0840 | ND |
| 2016-07-13 | 9588-006-0857 | ND |
| 2017-01-17 | 9588-009-0925 | ND |
| 2017-07-19 | 9588-006-0934 | ND |
| 2017-07-19 | 9588-010-0900 | ND |
| 2017-07-19 | 9588-005-0915 | ND |
| 2018-01-11 | 9588-009-0847 | ND |
| 2018-07-20 | 9588-006-1014 | ND |
| 2018-07-20 | 9588-005-1000 | ND |
| 2018-08-13 | 9588-010-0850 | ND |
| 2018-10-19 | 9588-010-0945 | ND |
| 2019-02-21 | 9588-009-0842 | ND |
| 2019-07-22 | 9588-006-0905 | ND |
| 2019-07-22 | 9588-010-0844 | ND |
| 2019-07-22 | 9588-005-0919 | ND |