Radon is a naturally occurring radioactive gas formed during the decay of uranium and radium in bedrock. In some regions, radon can dissolve into groundwater and enter buildings through wells and water systems. The problem is most common in drilled bedrock wells but may occur in other groundwater sources as well.
Common Indicators
- Typically no visible signs
- Can only be verified through testing
- Common in drilled bedrock wells
- May contribute to elevated indoor radon levels
Suitable for
- Groundwater
- Drilled Bedrock Wells
- Private Drinking Water Supplies
Common Treatment Methods
- Aeration
- Degassing
- Aeration Columns
- Forced Degassing
Advantages
- High Removal Efficiency Possible
- Proven Technology
- Relatively Simple Treatment Principle
- Can Be Combined with Other Water Treatment Technologies
Limitations
- Requires Dedicated Equipment
- Requires Laboratory Analysis
- May Require Subsequent Disinfection
- Does Not Automatically Solve Other Water Quality Issues
Example Treatment Trains
Well Water
↓
Aeration / Degassing
↓
UV Disinfection
↓
Drinking Water
Well Water
↓
Aeration
↓
Iron Filter
↓
Fine Filtration
↓
UV Disinfection
↓
Drinking Water
Well Water
↓
Aeration / Degassing
↓
Iron Filter
↓
Water Softening
↓
UV Disinfection
↓
Drinking Water
Radon in water is invisible, odourless and normally has no impact on taste or appearance. Laboratory testing is the only reliable way to determine radon concentrations. When radon-containing water is used in showers, taps or other household applications, part of the radon may be released into indoor air, which is one reason elevated levels should be addressed. Since aeration and degassing intentionally expose water to air, a downstream hygienic barrier such as UV disinfection is often recommended to reduce the risk of bacterial growth or recontamination before the water is used for drinking.