1,2,4-Trichlorobenzene
Mountain Springs Water Supply Corporation
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-03-13 | Q1810191003 | ND |
| 2018-03-13 | Q1810191005 | ND |
| 2018-03-13 | Q1810191001 | ND |
| 2018-06-28 | Q1826059002 | ND |
| 2019-01-28 | Q1904051006 | ND |
| 2019-01-28 | Q1904051008 | ND |
| 2019-01-28 | Q1904051010 | ND |
| 2019-01-28 | Q1904051012 | ND |
| 2020-05-13 | Q2019339010 | ND |
| 2020-09-29 | Q2038336001 | ND |
| 2020-11-05 | Q2043235022 | ND |
| 2020-11-05 | Q2043235008 | ND |
| 2020-11-05 | Q2043235004 | ND |
| 2021-11-16 | Q2132004001 | ND |
| 2021-11-16 | Q2132004003 | ND |
| 2021-11-16 | Q2132004005 | ND |
| 2021-11-16 | Q2132004007 | ND |
| 2022-10-18 | Q2231735009 | ND |
| 2022-10-18 | Q2231735011 | ND |
| 2022-10-18 | Q2231735013 | ND |
| 2022-10-18 | Q2231735015 | ND |
| 2023-11-30 | Q2351033007 | ND |
| 2023-11-30 | Q2351033009 | ND |
| 2023-11-30 | Q2351033011 | ND |
| 2023-12-13 | Q2353413003 | ND |