Waterborne Radon Removal in Connecticut and Westchester County NY


Connecticut Basement Systems Radon Inc (CBSR) was the first Connecticut based company to offer waterborne radon removal in Connecticut.

The two most common methods or technologies used for waterborne radon mitigation technologies are granular activated carbon (GAC) filtration and water aeration.

There are currently no defined standards for radon in water. However, the EPA has proposed a maximum contaminant level (MCL) of 300 pCi/L for municipal supplies with an alternative maximum contaminant level (AMCL) of 4,000 pCi/L for municipalities that adopt a multimedia mitigation (MMM) program. The state of Connecticut currently recommends reducing  your radon in water concentrations if they exceed 5,000 pCi/L.

Waterborne radon levels fluctuate due to climate conditions, Geographic shifts, water usage, etc. When water migrates through cracks & fissures in the sub-surface layers of the earth's crust, it is exposed to a wide array of bedrock compositions. The longer the time frame a sub-surface volume of water spends in contact with a radium bearing source, the greater the radon concentration that will dissolve into that volume of water.

We have an intimate understanding of the interaction of all water conditioning and treatment functions, and the treatment options available for waterborne radon.


Dual Chamber RP 415 SDQP Bubble Up Aeration System

Dual Chamber RP 415 SDQP Bubble Up Aeration System

Airaider 433 S50

Airaider 433 S50

Bubble Up Jr Interactive

Bubble Up Jr Interactive

AiRaider 433 DAB constant pressure

AiRaider 433 DAB constant pressure

The Process of Water Aeration

The aeration of water is as old as time itself. Prime examples of aeration taking place in nature are water cascading over waterfalls, or water coursing down a rocky river bed. Aerating water can also strip volatile organic compounds (VOC's) out of water. High removal efficiencies, no radioactive buildup, & better water pressure at points of use continue to make aeration the best available technology (BAT) for waterborne radon removal.

Contact us if you are concerned about radon or the water quality in your home or business water supply. Based in Stratford, CT we service clients throughout Connecticut as well as Westchester county New York.

Because of the high-removal efficiencies, and no radioactive buildup and/or exposure issues, water aeration services continue to be recognized as the best available technology by the EPA for waterborne radon removal. Contact us at (800) 319-8867 for a free evaluation for installation of an aeration system.

Granular Activated Charcoal Filtration

The benefits of water filtered by charcoal has been recognized for centuries.

tank GAC with clear Big Blue sediment filters w Atlantic UV MP 36C UV system

Two tank GAC with "big blue" pre & post filters and UV sterilization

Granular Activated Carbon (GAC) filtration removes radon and VOCs (Volatile Organic Compounds) by the process of "adsorption." This is a process where a gas or compound adheres to the surface of an adsorbent. In this case, the adsorbent is carbon.

Carbon is "activated" by being superheated in an oxygen-free environment. A multitude of pore space is created on each grain of carbon by this process. It is the immense network of pores in a bed of activated carbon that give GAC its superior filtration capabilities.

Two tank GAC with "big blue" pre & post sediment filters

Single tank GAC with clear "big blue" pre & post sediment filters

As radon-contaminated water runs through a bed of carbon, the carbon "adsorbs" the radon out of the water, onto the pore space. Caution should be exercised when choosing to use GAC filtration as a waterborne radon mitigation strategy. The most important aspect to consider is; range of fluctuation of radon levels in the well under consideration for mitigation. Worst case scenario should always be considered as well as overall water quality. GAC can become quickly "loaded" or fouled if installed in a home with a well that has other organic compounds present in excessive amounts. If in fluent radon levels are too high, a sufficient reduction of the waterborne radon concentration may not be achieved for the complete service cycle.

While EPA does not regulate what system should be used at what level, the state of Connecticut currently suggests that GAC can be considered to mitigate levels up to 10,000 pCi/L of waterborne radon. When concentrations exceed 10,000 pCi/L, aeration is the ideal technology to use.

Contact us if you’d like more information about our waterborne radon removal process. Based in Stratford, we serve clients throughout Connecticut as well as portions of New York.