p-Dichlorobenzene
North Castle Water District #2
p-Dichlorobenzene is a carcinogenic insecticide used in mothballs, and added to deodorant blocks made for trash cans and toilets. Long-term exposure can cause liver damage and kidney problems.
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 7 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 6 ppb
The EWG Health Guideline of 6 ppb for p-dichlorobenzene 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 cancer.
EPA Maximum Contaminant
Level (MCL): 75 ppb
The legal limit for p-dichlorobenzene, established in 1987, was based on toxicity studies conducted in laboratory animals in the 1980s. This limit may not fully protect against the risk of cancer due to p-dichlorobenzene exposure.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2020-02-25 | AW03859-POCS | ND |
| 2020-02-25 | AW03849-POCS | ND |
| 2020-07-21 | AW13840-POCS | ND |
| 2020-09-04 | AW17236-POCS | ND |
| 2020-09-04 | AW17232-POCS | ND |
| 2020-09-04 | AW17231-POCS | ND |
| 2020-09-04 | AW17229-POCS | ND |
| 2021-03-02 | AX04048-POCS | ND |
| 2021-03-03 | AX04220-POCS | ND |
| 2021-07-06 | AX13095-POCS | ND |
| 2022-03-01 | AY03624-POCS | ND |
| 2022-03-01 | AY03626-POCS | ND |
| 2022-07-19 | AY12488-POCS | ND |
| 2023-03-21 | AZ05021-POCS | ND |
| 2023-03-21 | AZ05013-POCS | ND |
| 2023-08-28 | AZ15886-POCS | ND |
| 2023-09-05 | AZ16354-POCS | ND |
| 2023-09-05 | AZ16356-POCS | ND |
| 2023-09-05 | AZ16357-POCS | ND |
| 2023-09-05 | AZ16353-POCS | ND |