/minerals

Radon

Learn what radon in drinking water is, its potential health risks, possible benefits, and effective strategies to address contamination and ensure water safety.

Reviewed by Content Team

Head of Content, Daniel Goren

Updated June, 5

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Radon

 

What Is Radon in Drinking Water?

 

Radon is a colorless, odorless, tasteless radioactive gas that naturally occurs from the decay of uranium in soil, rock, and groundwater. It can seep into homes through cracks in foundations, walls, and floors, but it can also enter household water supplies—especially groundwater from private wells. Radon typically becomes an issue when drinking water sources run through bedrock or geological formations containing uranium, increasing the likelihood that radon will dissolve in the water supply and enter homes.

When radon-contaminated water comes into your home, the gas can escape into the indoor air during everyday activities like showering, washing dishes, cooking, or doing laundry. This airborne radon can then be inhaled, posing significant health risks.

 

How Does Radon in Drinking Water Get into Homes?

 

Radon generally enters the home's drinking water through groundwater, rather than surface water sources like lakes, rivers, and reservoirs. Homes that rely on groundwater from wells located in areas with higher natural uranium levels can experience elevated radon concentrations in their water. As water flows from faucets or showers, radon gas escapes into the indoor air, gradually accumulating inside the home.

In areas such as St Louis and Nashville, homes that depend upon private wells or groundwater sources should be mindful of potential radon issues due to local geology. Regular testing and appropriate mitigation measures can effectively manage radon levels in drinking water and indoor environments.

 

Health Risks Associated with Radon in Drinking Water

 

Exposure to radon primarily occurs via inhalation, posing a significant lung cancer risk. According to the Environmental Protection Agency (EPA), radon inhaled from indoor air contaminated by drinking water accounts for approximately 168 deaths annually in the United States. Some important details about radon health risks include:

  • Lung Cancer Risk: Prolonged exposure through inhalation significantly increases your lung cancer risk, especially when combined with smoking. Radon exposure is considered the second leading cause of lung cancer in the U.S., behind cigarette smoking.
  • Stomach Cancer Risk: Although less common, ingesting radon from contaminated drinking water may slightly increase the risk of stomach and gastrointestinal cancers. The risk is substantially lower than the lung cancer risk associated with inhaling radon.
  • Higher Risk Homes: Homes using private wells, particularly in areas with naturally higher uranium levels in groundwater (such as regions near bedrock formations), are especially susceptible to elevated radon concentrations.

Due to these significant risks, the EPA recommends regularly testing your home's water and indoor air for radon, particularly if your water comes from private groundwater wells.

 

Are There Any Benefits of Radon in Drinking Water?

 

Radon has no direct health benefits. It is considered a harmful environmental contaminant with potential negative health consequences. However, identifying elevated radon levels may indirectly benefit homeowners by prompting proper design, remodeling, or implementation of mitigation techniques. When homeowners recognize radon issues, they commonly upgrade water treatment systems, seal building foundations, or increase home ventilation. These measures can enhance overall water quality and indoor air conditions, leading to healthier living environments overall.

 

How Can You Detect and Reduce Radon Levels in Your Drinking Water?

 

Radon in drinking water can be identified and managed with proper testing and mitigation strategies. Recommended steps include:

  • Testing: The first step toward identifying radon contamination is to test your drinking water. Professional radon testing companies and laboratories can provide precise measurements of radon concentrations.
  • Aeration Treatment Systems: Installing an aeration system is highly effective in removing radon from water. In these systems, the water passes through a device that exposes it to air, allowing radon gas to safely dissipate before reaching faucets inside the home.
  • Activated Carbon Filters: While not as effective as aeration for higher radon concentrations, activated carbon filtration units can adequately handle lower radon levels. Regular maintenance of these units is crucial, as their filtering medium accumulates radioactive particles over time.
  • Sealing and Structural Improvements: If the radon problem is extensive, supplementary structural improvements, such as sealing foundation cracks, properly ventilating crawl spaces and basements, and installing radon mitigation systems, will reduce health risks significantly.

Residents in busy metropolitan areas utilizing groundwater sources, including St Louis or Nashville communities, should consider periodically testing their water for radon and ensuring adequate treatment solutions are in place.

 

Conclusion: Understanding the Importance of Addressing Radon in Drinking Water

 

Radon in drinking water is an invisible yet serious health hazard, especially for homes with groundwater sourced from private wells. Understanding the potential dangers, regularly testing the water supply, and promptly implementing appropriate mitigation methods are essential steps to safeguard your household's health. Ensuring clean, radon-free drinking water contributes significantly to your family's overall well-being, benefiting long-term health and safety.

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Common Signs of Excess Radon in Water

 
Common Signs of Excess Radon in Water: What to Look For
 

Radon is an odorless, colorless, radioactive gas that naturally occurs due to the decay of uranium in soil, rocks, and groundwater. When radon accumulates in household water supplies, especially from private wells, it can pose serious health risks, notably an increased risk of lung cancer. While radon is impossible to detect through sight, taste, or smell, there are certain indirect signs and factors you can look for, as well as essential testing practices you can follow to identify its presence. Understanding these indicators and recommended actions can significantly aid in protecting your health and safety.

 
No Direct Sensory Signs Exist
 
A critical aspect to recognize is that radon itself does not create any visible, tasteable, or smellable indication in water. Unlike contaminants such as iron, sulfur, or chlorine, you will not experience any unusual odor, discoloration, or taste changes when radon is present. Therefore, judging based on sensory clues alone will not help you detect radon contamination.

 
Indirect Indicators and Risk Factors Associated with High Radon Levels
 

Since direct sensory signs don't exist, it's essential to consider several indirect indicators and risk factors that might suggest radon could be in your water:

  • Geographic Region: Areas with naturally rocky soil or bedrock, particularly granite formations, often have higher uranium content and therefore can produce substantial radon levels. If your property is located in regions known for elevated radon activity, you're more likely to experience radon issues.
  • Private Well Usage: Public water supplies typically undergo regular testing and treatments, reducing radon levels. However, if your home relies on private wells, radon buildup could go undetected for extended periods, significantly increasing risk.
  • Neighboring Radon Issues: If neighbors have tested positive for high radon in their water supply or have had radon mitigation systems installed, it could suggest a similar situation on your property. Radon presence typically occurs in clusters within geographical areas.
  • High Indoor Radon Levels: Although indoor radon usually enters homes through soil gas infiltration, prolonged radon in water usage can contribute significantly to indoor radon gas concentrations. If air testing shows elevated radon levels inside your home, water sources should also be tested to identify or rule out a secondary contributing factor.

 
Health Symptoms Associated with Radon Exposure
 

Radon exposure, particularly over extended periods, may lead to health concerns. While radon ingestion in drinking water is less hazardous than breathing radon gas from air (in terms of cancer risk), it's still crucial to identify potential airborne radon released when water is used in daily household activities such as showering, cooking, dishwashing, or laundry. Long-term radon inhalation significantly escalates the risk of developing lung cancer. Pay careful attention to persistent respiratory issues or unexplained respiratory symptoms in household occupants, notably:

  • Persistent coughing
  • Wheezing or shortness of breath
  • Frequent respiratory infections (bronchitis, pneumonia)
  • Chest pain or discomfort
  • While these symptoms are non-specific and potentially attributable to many other conditions, repeated respiratory illnesses without clear causes should prompt radon testing immediately.

 
Recommended Radon Testing Methods for Water
 

Due to its odorless and colorless nature, professional laboratory testing is the definitive and recommended approach to determine radon levels in your water supply:

  • Professional Test Kits and Laboratory Analysis: Well water should be tested by collecting a sample using a radon-specific water test kit. These kits typically require mailing collected water samples to a qualified laboratory for detailed analysis. The lab report will clearly indicate radon levels, advising whether mitigation steps are necessary.
  • Frequency and Timing for Testing: Private water wells should be tested for radon at least once every 3–5 years, though annual testing is the best practice. Additionally, retesting should occur whenever new components are installed or significant changes to the well's plumbing or structure are made.

 
Action Steps if Excess Radon is Found
 

If laboratory tests confirm radon concentrations above recommended limits (commonly above 4,000 picocuries per liter for water), action should be taken:

  • Aeration Treatment: An aeration system effectively mitigates radon in water, releasing radon gas before household use.
  • Granulated Activated Carbon (GAC) Systems: Another common method involves activated carbon filters that trap radon, helpful for lower to moderate levels.
  • Professional Installation and Application: Radon-prevention systems must be installed professionally, ensuring appropriate effectiveness, safety standards, and compliance with local regulations and building codes.

 
Conclusion: Why Awareness and Proactive Testing Are Essential
 

Excess radon in water cannot be directly sensed or observed, making preemptive and routine testing critical to household health. By understanding indirect indicators, radon exposure-related symptoms, and testing strategies, you can confidently and proactively maintain your family’s safety. Regular testing and immediate action provide peace of mind and significantly reduce the risk associated with excess radon in your home's water supply.

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How Radon Changes the Taste and Smell of Your Water

 
Understanding the Impact of Radon in Water on Your Appliances
 

Many homeowners understand radon as a gas that’s harmful when breathed, yet not everyone realizes that radon can also infiltrate drinking water sources. While radon's primary concern is typically its potential to cause health issues when inhaled or consumed, radon dissolved in water can also gradually contribute to appliance problems in your home over time.

When radon is present in your water supply, it is commonly introduced through groundwater. As this water is used in daily activities like cooking, showering, laundry, or dishwashing, radon is inevitably released in the form of gas. While the amount of radon released may seem minor, prolonged exposure can impact household appliances and plumbing systems. Understanding precisely how radon affects appliances and the necessary steps to prevent damage will save you both money and potential health concerns.

 
How Radon in Water Damages Your Appliances
 

Radon, chemically inert but radioactive, decays into radioactive particles, which can accumulate and pose risks. These particles can cause gradual damage in several main areas related to appliances and plumbing:

  • Corrosion and Damage to Pipes and Fittings: Radon decay products include radioactive isotopes (such as lead-210 and polonium-210) which can adhere to and build up within water pipes, storage tanks, and plumbing fixtures. Over time, this buildup can accelerate corrosion, weakening pipes and fixtures from the inside, leading to potential leaks and increased maintenance costs.
  • Impact on Appliances with Heating Elements: Appliances such as dishwashers and water heaters that rely on heating elements and coils may experience damage because radon and its decay products interact with metals, potentially hastening deterioration and efficiency loss. This can shorten the lifespan of these appliances, cause performance decline, and necessitate more frequent replacement.
  • Reduced Efficiency in Filters and Softeners: Radon and radioactive particles can settle and build up within water purification devices, filters, and softeners. Over time, this accumulation negatively affects appliance performance, reduces filter efficiency significantly, and increases operational costs for maintenance or filter replacements.
  • Deposits and Scaling Issues: When radon decays, it can form deposits within your entire plumbing and appliance systems. These fine deposits, combined with typical mineral content buildup, can lead to scaling and increased blockage potential. This restricts water flow through heating appliances (such as water heaters and boilers), forcing these appliances to work harder to heat water, increasing energy consumption and operating expenses.
  • Potential Increased Energy Costs: The combination of corrosion, scaling, and inefficiencies caused by radon and its byproducts often results in higher energy consumption to achieve desired appliance performance. Your washer, dishwasher, water heater, and even shower heads can require more energy or water pressure, which translates into higher monthly utility bills.

 
Signs That Radon May Be Affecting Your Appliances
 

Though radon is colorless and odorless, indirect signs can indicate radon or radioactive contaminants' possible presence in water affecting household appliances and plumbing:

  • Reduced water flow or pressure in plumbing fixtures
  • More frequent appliance breakdowns or shortened appliance lifespan
  • Visible corrosion or rust around pipes and fittings
  • Increased scaling or mineral deposits on appliance heating elements, faucets, or showerheads
  • Noticeably rising energy bills without obvious explanation

If these issues consistently appear despite standard maintenance and replacements, you should test your home's water supply for radon.

 
How to Address Radon in Your Water Supply and Protect Your Appliances
 

To protect your home appliances and ensure water safety, consider these specific solutions for radon removal:

  • Aeration Systems: The most effective radon removal method involves using an aeration system designed to release radon gas from the water supply. As water passes through the aeration unit, air bubbles evaporate radon out of the water. The released radon gas is then properly vented outside the home. Aeration systems can lower radon concentrations by as much as 90% or more, safeguarding your pipes, fixtures, and appliances effectively.
  • <li><b>Granular Activated Carbon (GAC) Filters:</b> GAC filters attract and trap radon within their carbon media. As water passes through this media, radon is absorbed efficiently. While they’re relatively less expensive upfront, they may require regular replacement and careful disposal, as radioactive particles can build and concentrate within the carbon medium.</li>
    
    <li><b>Radon Testing and Monitoring:</b> Regular testing and monitoring of radon levels in your home water supply can help you detect problems early. Local professionals can perform standardized radon tests to provide exact radon concentration levels, allowing informed decision-making about available treatment options suitable for your primary concerns and situation.</li>
    
    <li><b>Professional Plumbing Inspections:</b> Periodic professional inspections and routine plumbing and appliance maintenance will help detect radon-induced issues in your system before significant damage occurs. Preventative actions and timely repairs are crucial to extending your appliances' lifespan and avoiding escalated maintenance costs down the line.</li>
    

 
Final Recommendations
 

Considering the potentially severe appliance damage and increased costs caused directly and indirectly by radon in your home's water supply, prevention and remediation become essential. Testing for radon regularly, installing radon removal systems such as aeration or activated carbon filtering, and proactive plumbing inspections will safeguard your appliances and piping, reduce long-term maintenance expenses, improve equipment efficiency, and most importantly, protect your household from unnecessary exposures to potential radon health risks.

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How Radon Changes the Taste and Smell of Your Water

 
Understanding Radon in Water
 

Radon is a naturally occurring radioactive gas produced from the breakdown of uranium found in rocks and soil. It dissolves into water underground, potentially contaminating wells and aquifers. Since radon is odorless, colorless, and tasteless, it doesn't produce any immediate noticeable sensory changes in your drinking water. Its physical and chemical properties enable it to easily blend without causing apparent alterations to water's appearance, odor or flavor.

 
Radon's Impact on Taste
 

Radon itself, due to its inert nature and chemical makeup, does not directly impart any taste to your drinking water. If your water has changed noticeably in flavor—more metallic, earthy, or chemically—it is likely not caused solely by radon. Instead, the taste alteration might stem from other dissolved elements or contaminants within the water, such as iron, manganese, hydrogen sulfide, chlorine, organic materials, or algae rather than radon itself.

However, it is important to note:

  • Radon gas itself is tasteless and unlikely to cause a perceptible change in water flavor.
  • If your water has a distinctive taste, other contaminants are usually responsible.
  • Testing water regularly is crucial, as taste alone will not detect radon presence.

 
Radon's Influence on Smell
 

Similarly, radon gas has no known odor. It cannot be detected by human smell, and it does not cause water to have any distinct or unusual smell. If your drinking water emits a strange odor—whether unpleasant, sulfurous, metallic, or musty—the likely culprit is not radon. Instead, the presence of odors typically signals contamination from other minerals, organic compounds, bacteria, or chemical sources.

Key points about radon and smell:

  • Radon is odorless and undetectable by smell alone.
  • Unpleasant odors are typically caused by bacteria, algae growth, hydrogen sulfide (causing "rotten egg" smell), excess chlorine treatment, or other dissolved substances.
  • Routine testing by specialized laboratories is critical to detect radon, as you won’t detect it yourself through smell.

 
Common Misconceptions About Radon in Water
 

There is a frequent misunderstanding that radioactive substances like radon could cause noticeable sensory differences in water due to their harmful effects. However, despite its potential health risks, particularly associated with lung cancer from inhalation during showering or other activities releasing the gas, radon itself does not manifest through noticeable odor, taste, or color changes.

Important clarifications:

  • The hazards of radon in water stem primarily from inhalation upon release, rather than direct drinkability.
  • Taste or smell changes are not reliable indicators of radon's presence; only specialized testing can reliably detect it.
  • Sensory changes are typically unrelated to radon, emphasizing the importance of appropriate testing.

 
Ensuring Your Water is Safe from Radon
 

Since radon cannot be detected personally through sensory evaluation, the only reliable method to identify radon presence in drinking water is systematic testing. You can:

  • Conduct routine professional laboratory tests to accurately measure radon concentrations.
  • Install appropriate water treatment methods (e.g., activated carbon filters, aeration units) after professional evaluation, if radon levels surpass recommended limits.
  • Regularly monitor and maintain your water supply and filtration systems to ensure continued safety and compliance.

 
Conclusion: Taste and Smell Are Not Indicators of Radon's Presence
 

In simple terms, radon gas does not affect the taste or smell of your drinking water at all. If your water has developed unusual characteristics, other contaminants or sources should be investigated. Because radon is completely undetectable through human senses, regular and professional testing remains crucial to ensuring your water's safety and protecting you and your family’s health.

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