p-Dichlorobenzene
Roland Water Supply
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 6.50 ppb | 1 | 1 | 6.50 ppb |
| 2016 | 9.34 ppb | 5 | 5 | 4.60 ppb - 15.0 ppb |
| 2017 | 1.55 ppb | 4 | 3 | ND - 2.60 ppb |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2015-01-14 | OE209901 | 6.50 ppb |
| 2016-01-29 | OE339989 | 6.60 ppb |
| 2016-04-05 | OE362006 | 9.50 ppb |
| 2016-07-19 | OE403194 | 11.0 ppb |
| 2016-07-19 | OE403195 | 15.0 ppb |
| 2016-10-21 | OE443659 | 4.60 ppb |
| 2017-02-14 | OE480522 | 1.70 ppb |
| 2017-04-03 | OE497019 | 2.60 ppb |
| 2017-07-24 | OE541407 | 1.90 ppb |
| 2017-11-09 | OE588503 | ND |
| 2018-01-08 | OE607970 | ND |
| 2018-07-24 | OE687489 | ND |
| 2019-07-17 | OE836045 | ND |