1,2,4-Trichlorobenzene
North Wales Water Authority
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 |
|---|---|---|---|---|
| 2018 | ND | 13 | 0 | ND |
| 2019 | ND | 12 | 0 | ND |
| 2020 | ND | 12 | 0 | ND |
| 2021 | ND | 11 | 0 | ND |
| 2022 | ND | 11 | 0 | ND |
| 2023 | ND | 10 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-03-12 | 20180932 | ND |
| 2018-03-12 | 20180940 | ND |
| 2018-03-12 | 20180939 | ND |
| 2018-03-12 | 20180938 | ND |
| 2018-03-12 | 20180937 | ND |
| 2018-03-12 | 20180936 | ND |
| 2018-03-12 | 20180935 | ND |
| 2018-03-12 | 20180934 | ND |
| 2018-03-12 | 20180933 | ND |
| 2018-03-13 | 20180956 | ND |
| 2018-06-05 | 20182148 | ND |
| 2018-09-04 | 20183373 | ND |
| 2018-12-18 | 20184775 | ND |
| 2019-03-05 | 20190857 | ND |
| 2019-03-12 | 20190960 | ND |
| 2019-03-12 | 20190956 | ND |
| 2019-03-12 | 20190964 | ND |
| 2019-03-12 | 20190957 | ND |
| 2019-03-12 | 20190963 | ND |
| 2019-03-12 | 20190962 | ND |
| 2019-03-12 | 20190958 | ND |
| 2019-03-12 | 20190961 | ND |
| 2019-03-12 | 20190959 | ND |
| 2019-09-03 | 20193443 | ND |
| 2019-12-03 | 20194748 | ND |
| 2020-03-03 | 21849459.00 | ND |
| 2020-03-03 | 21849438.00 | ND |
| 2020-03-03 | 21849417.00 | ND |
| 2020-03-03 | 21849480.00 | ND |
| 2020-03-03 | 21849501.00 | ND |
| 2020-03-03 | 21849522.00 | ND |
| 2020-03-03 | 21849396.00 | ND |
| 2020-03-03 | 21849543.00 | ND |
| 2020-06-02 | 22418572.00 | ND |
| 2020-06-02 | 22418593.00 | ND |
| 2020-09-01 | 23001527.00 | ND |
| 2020-12-01 | 23539401.00 | ND |
| 2021-03-01 | 24062302.00 | ND |
| 2021-03-01 | 24062386.00 | ND |
| 2021-03-01 | 24062260.00 | ND |
| 2021-03-01 | 24062365.00 | ND |
| 2021-03-01 | 24062344.00 | ND |
| 2021-03-01 | 24062323.00 | ND |
| 2021-03-01 | 24062281.00 | ND |
| 2021-03-02 | 24062407.00 | ND |
| 2021-06-01 | 24640220.00 | ND |
| 2021-09-09 | 25222339.00 | ND |
| 2021-12-14 | 25766369.00 | ND |
| 2022-03-01 | 26289323.00 | ND |
| 2022-03-09 | 26289239.00 | ND |
| 2022-03-09 | 26289302.00 | ND |
| 2022-03-09 | 26289281.00 | ND |
| 2022-03-09 | 26289176.00 | ND |
| 2022-03-09 | 26289218.00 | ND |
| 2022-03-09 | 26289197.00 | ND |
| 2022-03-09 | 26289260.00 | ND |
| 2022-06-07 | 26844652.00 | ND |
| 2022-09-20 | 27443444.00 | ND |
| 2022-12-06 | 28000350.00 | ND |
| 2023-03-07 | 28523002.00 | ND |
| 2023-03-08 | 28522939.00 | ND |
| 2023-03-08 | 28522897.00 | ND |
| 2023-03-08 | 28522981.00 | ND |
| 2023-03-08 | 28522960.00 | ND |
| 2023-03-08 | 28522918.00 | ND |
| 2023-06-05 | 29110394.00 | ND |
| 2023-06-19 | 29110347.00 | ND |
| 2023-09-12 | 29701898.00 | ND |
| 2023-11-17 | 30073300.00 | ND |