p-Dichlorobenzene
Helena Water System
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-05-27 | H14050436-001A | ND |
| 2014-05-27 | H14050436-002A | ND |
| 2015-05-21 | H15050321-001A | ND |
| 2015-05-21 | H15050321-002A | ND |
| 2015-05-21 | H15050321-003A | ND |
| 2016-05-10 | H16050166-001A | ND |
| 2016-05-10 | H16050166-002A | ND |
| 2017-05-25 | H17050520-001A | ND |
| 2017-05-25 | H17050520-002A | ND |
| 2018-05-29 | H18050689-001A | ND |
| 2018-05-29 | H18050689-002A | ND |
| 2018-05-30 | H18050718-001A | ND |
| 2019-07-12 | H19070266-001A | ND |
| 2019-07-12 | H19070266-002A | ND |