Radon mitigation & water treatment, radon mitigation systems, testing & removal by EPA certified air quality specialists Household Environmental Derry, New Hampshire.
For radon mitigation system cost in NH, MA, CT, ME, VT and RI, call(866) 867-2366, Household Environmental Derry, NH.

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Radon Mitigation Services

Radon mitigation is the process of reducing radon in the home, radon in the basement to safer levels, be it from the air or from the water supply, utilizing methods specific to the construction of the home.
Any information that you may have regarding the construction of your property will help us determine the best method for mitigating. Prior to designing a system, we will perform a visual inspection of the property and design a system that considers specific features of the building. If this visual inspection fails to provide enough information, we will need to perform diagnostic tests to help design the best radon mitigation system for your property.
Our radon mitigation systems work extremely well. Some radon mitigation systems can reduce radon levels in your home by up to 99%. Household Environmental will always reduce radon levels below 4.0 pCi/L, and most times, well below 1.0 pCi/L.
Professionally Customized Solutions  Radon mitigation systems are not something taken out of a box and installed in your home like a furnace or a water heater. Each system is custom-designed and built piece by piece, based upon the construction of your home. As our systems are guaranteed to reduce your radon levels, our main focus is on making the system blend into your home.
There are several methods that we use to lower radon levels in your home. Some methods prevent radon from entering the building while others reduce high levels of radon gas that have already entered the building. The EPA recommends methods which prevent the entry of radon altogether.
Sometimes we use a smoke puffer to find the source and direction of air movement. We learn air flow sources and directions by watching a small amount of smoke that we shoot into holes, drains, sumps, and along cracks. The sources of air flow indicate probable radon routes.
Another type of diagnostic test is a soil communication test. This test uses a vacuum cleaner and a device called a micromanometer to determine how easily air can move from one point to another under the slab. We insert a vacuum cleaner hose in one small hole and using the micromanometer in a second small hole, we can see how air flow is affected from the force of the vacuum cleaner's suction. Watching pressure differentials during a soil communication test helps us determine which configuration will work most efficiently in your home.
Certain factors can determine the type of system required without the need for diagnostic testing. Specific foundation designs, the type of material under the building and our experience with similarly constructed buildings and similar radon test results all play a major role in the type of system we install.
Our specialty is the installation of systems that reduce (mitigate) high levels of radon gas found in the air inside residential properties. We supply a contract and written warranty at the time of estimate.
The following are a few types of mitigation systems we install:
Depressurization System
Active Soil Depressurization (Sub-Slab)  This is by far the most commonly installed system in the Northeast. A three-to-five-inch hole is cored through the concrete slab, sometimes in more than one location. Five to ten gallons of sub-slab material (sand, gravel, etc.) is then excavated through the hole. This creates a suction point. Special PVC piping is then installed and run above the roof line. This may be done through closets in the house, interior walls, through a garage or any of 100+ other routes. The pipe is attached to the intake side of a radon-specific exhaust/suction fan which is mounted in a non-livable area of the building. Additional piping is then connected to the output side of the fan and terminates outdoors, above the roof line. All contributing cracks and holes in the floor are sealed with a polyurethane-based sealant. When the system is activated, the fan suction creates a negative pressure field below the slab and draws radon gas to the suction pit and up the pipe before it can enter the living space. The radon gas is then exhausted to the outside air, where it quickly dissipates. A passive system monitor is installed on the system that indicates the system is functioning. We can optionally install an active monitor that will alert you to a system malfunction.
Sub-Membrane Depressurization  Sub-membrane systems are installed in buildings that have a crawl space or basement with a dirt floor or other material such as ledge-cropping. This system is a network of special perforated pipe placed along the surface of the floor. The entire floor is covered by a polyethylene or rubber vapor barrier. A single pipe exits the barrier. A damper is installed within the pipe to regulate airflow. The remaining system is identical to the sub-slab system.
High-Efficiency Aerator
High-Efficiency Aeration  These systems send thousands of tiny bubbles from bottom to top through the water in a tank, essentially "freeing" the radon from the water and venting it out of the building where it dissipates into the air. This works much like a bottle of soda, where effervescence occurs and releases the carbon dioxide into the air. From a cost standpoint, this is the most expensive method. Yet, it is also the safest, most effective and easiest to maintain.
Granular-Activated Carbon (Charcoal or GAC)  In this method, water is forced through granulated carbon and radon becomes trapped or lost in tiny crevices in the carbon. Much like the workings of a lobster trap, radon finds its way in, but cannot find its way out.
Dual GAC Unit
GAC is the most cost-effective solution for removing high levels of radon in water. By utilizing our annual 100% carbon recycling/replacement program, our clients can be assured of years of trouble-free service. Small carbon filters attached to kitchen faucets or under sinks are inadequate for removing radon from drinking water.
Our Guarantee:  We guarantee to reduce the radon level in your home to below 4.0 pCi/L. In some instances, we will guarantee radon levels below 2.0 pCi/L. If the included, independent third-party post-mitigation testing reveals radon levels above our guaranteed result, we will return, at no charge to you, to make any necessary adjustments to the system to get the level down. Click the following links to view them:
  • Radon in Air: Radon Sub-Slab Depressurization System Warranty
  • Radon in Water: Radon Water Mitigation Warranty

  • For example, the material we excavate from the hole may not be indicative of the majority of sub-slab material. A footing may be larger than anticipated, obstructing airflow or any of a number of other issues. However, the great majority of our systems ultimately reduce your radon level below 1.0 pCi/L, nearly equivalent to the outside air.
    To most, mitigation sounds very complex and expensive. In reality, mitigation is very straightforward and relatively affordable.

    Radon Mitigation Cost

    The cost of making repairs to reduce radon in air depends largely on how the structure was built and the extent of the radon problem. A standard sub-slab depressurization system starts at $1,095. The presence of a crawl space or dirt floor, the options you choose, the type of fan required for your home as well as many other factors can increase that price dramatically.
    The cost to treat radon in water depends on the type of system installed, the amount of radon present in the water, access to supply lines and other factors. The cost can be as low as $1,000 for a carbon system or as low as $3,750 for an aeration system.
    If you feel you may have a radon gas problem or indoor air quality issue, contact Household Environmental today at (866) 86-RADON or use our Radon Client Survey Form to schedule your free, no-obligation analysis and estimate. We will be happy to assist in providing the highest level of service possible, 24 hours a day.

    Radon gas inspection & testing, radon mitigation systems & mold removal for NH, MA, CT, ME, and RI by the certified air quality specialists
    Household Environmental, Derry, New Hampshire


Bubbles generated by a High-Efficiency Aeration System
Bubbles generated by a High-Efficiency Aeration System
FACT: High-Efficiency Aeration Systems send thousands of tiny bubbles from bottom to top through water in a tank, essentially "freeing" the radon from the water and venting it out of the building where it dissipates into the air.
Q: You talk about an unobtrusive system. Every radon system I have ever seen are fairly unattractive. Are there systems available that are not as unsightly?
A: Our radon mitigation systems will always reduce the radon level to below the EPA action level of 4.0 pCi/L. Therefore, our systems are designed with aesthetics in mind. We do our best to have the system blend into your house. If we must install the system on the exterior of your home, we go so far as to acetone the piping so that it is clean and shiny. We have done our job when you do not even know the system is there.
Professional Affiliations: National Association of Mold Professionals Member of the National Radon Safety Board

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Radon Mitigation & Water Treatment in New Hampshire
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