How Do You Effectively Treat Iron Bacteria in Well Water?

If your well water has an orange or rust-colored slime, a swampy or rotten-egg smell, or reduced flow from clogged fixtures, you likely have iron bacteria. It's distinct from ordinary iron staining — you're dealing with a living organism that feeds on dissolved iron, not just dissolved minerals. Treatment requires eliminating the bacteria, not just filtering the iron. If you're also dealing with dissolved iron in general, see our guide to removing iron from well water.

How to Effectively Treat Iron Bacteria in Well Water

Effectively treating iron bacteria in well water requires a multi-pronged approach, starting with physical cleaning of the well and plumbing to remove existing biofilm. This is typically followed by chemical shock treatments using disinfectants like shock chlorination with household bleach or hydrogen peroxide, which kill the bacteria throughout the system. For persistent problems and long-term prevention, installing continuous disinfection and filtration systems, such as chemical injection pumps (chlorine or peroxide) or aeration and oxidation filters, provides ongoing protection against recurrence and removes oxidized minerals.

What is Iron Bacteria in Well Water?

Iron bacteria are naturally occurring, non-pathogenic microorganisms found in groundwater. They combine dissolved iron or manganese with oxygen from the water to form sticky, slimy deposits. Unlike harmful pathogens, iron bacteria do not typically pose a direct health threat for consumption. However, their accumulation leads to aesthetic and plumbing issues.

These bacteria oxidize dissolved iron, converting it into insoluble ferric iron, which then precipitates out of the water. This process creates a reddish-brown, gelatinous material known as "biofilm" or "iron ochre." This slime can adhere to the inside surfaces of your well casing, pump, pipes, and fixtures, leading to a range of problems throughout your water system.

The biological process involves these bacteria using dissolved ferrous iron as an energy source. They convert it into insoluble ferric iron, which then precipitates from the water. This oxidized iron, combined with the bacteria's slimy excretions, forms the characteristic reddish-brown, often stringy, slime. This "bacterial iron" or "manganese bacteria" can proliferate quickly under suitable conditions, forming thick layers of biofilm that can significantly affect water quality and infrastructure.

Causes of Iron Bacteria Growth in Well Water

Iron bacteria are common in many groundwater sources. However, certain conditions can lead to their increased growth, making them a noticeable problem in well water systems. Understanding these contributing factors is a first step toward effective treatment and prevention strategies.

• Presence of Dissolved Iron or Manganese: This is the primary food source for iron bacteria. Wells drilled in areas with naturally high iron or manganese content in the groundwater are particularly susceptible to bacterial growth.
  
  
• Oxygenated Environments: Unlike some anaerobic bacteria, iron bacteria require oxygen to thrive. This makes areas such as the well casing, pumping system, and pressure tank, where water is exposed to air, ideal breeding grounds for their colonies.
  
  
• Low Water Flow Areas or Stagnant Water: Wells that are used infrequently, dead-end pipes within the plumbing system, or sections with minimal water flow allow bacteria to settle and multiply without disturbance. These conditions promote the formation of dense colonies and thick biofilm layers.
  
  
• Initial Well Drilling or Maintenance Activities: The process of drilling a new well, or subsequent well maintenance procedures, can introduce iron bacteria into the well system. This can occur from surface soil contamination or from contaminated equipment used during the process. Once introduced, these bacteria can establish a presence and begin to grow.
  
  

How to Identify Iron Bacteria in Your Well Water

Early detection of iron bacteria is important for minimizing its impact on your well system and plumbing infrastructure. While some symptoms may resemble those of high iron content alone, the presence of slime is a clear indicator of bacterial activity.

• Taste and Odor Indicators: One of the most common and noticeable signs. Water may develop metallic, swampy, sewage-like, or even a slightly sweet smell, often described as a "rotten vegetable" or "fuel-like" odor. These odors are particularly strong after the water has sat undisturbed for a period, such as in the morning or after a vacation. This can sometimes be confused with a rotten egg smell, which typically indicates sulfur bacteria, though both types of bacteria can coexist.
  
  
• Water Color Changes: Your water may appear reddish-brown, orange, or yellowish. This coloration is particularly apparent after sitting in a glass for a while, as dissolved iron oxidizes upon contact with air, or when the water is first drawn from the tap.
  
  
• Slimy Deposits and Biofilm: This is the most definitive sign. You will observe slimy, gelatinous, or stringy reddish-brown or yellowish-brown material. This material can be found in toilet tanks, sink drains, faucet aerators, showerheads, or inside pipes. This biofilm can have a greasy or clumpy texture.
  
  
• Reduced Water Flow: The accumulation of bacterial slime and oxidized iron within pipes, filters, and fixtures can gradually restrict water flow. This restriction leads to noticeable pressure drops, slow-filling toilets, or clogged washing machine inlets. Over time, this buildup can progress to complete blockages within the plumbing system. If you are experiencing low water pressure, learn how to increase water pressure from a well.
  
  

Understanding the Impacts of Iron Bacteria

While iron bacteria are not typically a direct health threat, their presence in your well water can lead to a range of challenging issues throughout your home's plumbing and appliances.

• Plumbing Corrosion and Damage: Iron bacteria create an environment that can lead to the formation of aggressive ferric chlorides. These corrosive byproducts can degrade metal pipes and plumbing components, potentially causing weakened surfaces, pitting, and even premature system failure and leaks over time.
  
  
• Water Flow and Drain Blockages: The slimy buildup produced by the bacteria, often referred to as "orange sludge," can significantly restrict water flow in pipes and slow drains. This can result in partial or complete blockages within your household plumbing, potentially requiring professional intervention to clear.
  
  
• Appliance Efficiency and Lifespan: Slime buildup can insulate hot water heaters, requiring them to work longer to heat water. This reduces their efficiency and increases energy costs. The buildup can also clog internal components of dishwashers, washing machines, and other water-using appliances, reducing their lifespan and potentially leading to costly repairs or replacements.
  
  
• Potential Health Concerns and Misconceptions: It is important to clarify that iron bacteria itself is generally not pathogenic or harmful to human health when consumed. However, its presence can create an anaerobic environment within your well or plumbing system. This environment can foster the growth of other, potentially harmful, anaerobic bacteria, such as sulfur-reducing bacteria, which cause a rotten egg smell. While the primary issue is aesthetic and mechanical, it does affect the palatability and overall perceived quality of your drinking water.
  
  

Accurately Testing for Iron Bacteria in Well Water

Before beginning any treatment, it is important to confirm the presence of iron bacteria and assess their activity level. This approach helps ensure you apply the correct strategy and avoid unnecessary efforts. To learn more about how to test water quality at home, read our complete guide.

• At-Home Testing Kits (BART Test): BART tests are popular, relatively inexpensive, and easy-to-use kits for homeowners. They consist of a sterile tube containing a growth medium and a small ball. When a water sample is added, specific reactions over several days indicate the presence of iron-related bacteria and provide an indication of their activity levels. These kits serve as a good starting point for an initial diagnosis.
  
  
• Professional Laboratory Water Testing: Sending a water sample to a certified environmental laboratory provides a more accurate and comprehensive analysis. Laboratories can identify specific bacterial types, quantify concentrations, and often provide insights into other water quality parameters (such as iron, manganese, and pH levels) that influence bacterial growth. This method is recommended for persistent or severe issues.
  
  
• Collecting a Water Sample for Testing: To ensure reliable test results, proper sample collection is important. Always use sterile containers provided by the testing kit or the laboratory. For well water, it is often best to collect samples from an outdoor spigot before any treatment systems, or from the well itself if accessible, to obtain a representative sample of the raw well water. Follow the specific instructions provided with your test kit or by the lab regarding sterile technique and sampling points.
  
  

Comprehensive Methods to Treat Iron Bacteria in Well Water

Addressing iron bacteria often requires a multi-pronged approach that combines physical cleaning with chemical or mechanical treatments. There is no single solution that fits all situations; the choice of treatment depends on the severity of the problem, the well's characteristics (such as depth and diameter), and the desired long-term outcome.

Initial Physical Removal and Cleaning

Before introducing chemicals or installing systems, physically removing as much slime and buildup as possible from the well casing, pump, and pipes is important for treatment success. This initial step helps expose the bacteria to disinfectants and improves the overall effectiveness of subsequent treatments.

• Importance of Mechanical Cleaning: This phase aims to dislodge and remove accumulated biofilm, which can shield bacteria from chemical treatments. Without this step, chemicals may not penetrate deep enough to eliminate all bacterial colonies.
  
  
• Professional Well Servicing: For thorough cleaning, hiring a licensed well contractor is recommended. These professionals have specialized equipment to safely pull the well pump, brush the well casing walls, and jet or hydro-clean the well physically, dislodging stubborn slime and debris.
  
  
• Cleaning Fixtures and Appliances: Thoroughly cleaning accessible affected fixtures, screens, faucet aerators, and appliance components (such as washing machine inlets or dishwasher filters) will remove visible slime and help prevent immediate reintroduction of bacteria into the system.
  
  

Shock Chlorination Treatment for Wells

Shock chlorination is a common and effective method for addressing an active iron bacteria infestation in a well. It involves temporarily introducing a high concentration of chlorine into the well and plumbing system.

• What is Shock Chlorination? This process uses a strong oxidizer, typically household bleach (sodium hypochlorite) or granulated chlorine, to kill bacteria, including iron bacteria, by disrupting their cellular structure. It is a widely used method for well disinfection.
  
  
• Calculating Chlorine Dosage and Application: The goal is to achieve a concentration of approximately 200 PPM (parts per million) of chlorine in the well water. The precise amount required depends on the well's depth and diameter. This calculated amount of chlorine is carefully poured directly into the well casing access point, often requiring a method to ensure it mixes thoroughly throughout the water column.
  
  
• Circulating and Retention Times: Once chlorine is added, it is important to circulate the solution throughout the entire plumbing system. This involves running water from all indoor and outdoor faucets, flushing toilets, and running water through appliances until a noticeable chlorine odor is detected at each point. After circulation, the chlorinated water must remain in the system for a sufficient contact time, typically 12-24 hours, to allow the chlorine to effectively kill the bacteria.
  
  
• Safety Precautions and Post-Treatment Steps: Always wear appropriate safety gear (gloves, eye protection) and ensure proper ventilation when handling chlorine. After the retention period, the system must be thoroughly flushed until the chlorine odor is gone and chlorine residual tests (using a simple pool test kit) show safe levels. The highly chlorinated water should be discharged responsibly, avoiding septic systems or sensitive vegetation. After 1-2 weeks, retest your water for iron bacteria to confirm treatment effectiveness.
  
  

Hydrogen Peroxide Treatment: An Alternative Method

For those seeking an alternative to chlorine, particularly due to its odor or residual effects, hydrogen peroxide offers a viable solution for shocking a well.

• Why Use Hydrogen Peroxide? Hydrogen peroxide is a powerful oxidizer that effectively kills iron bacteria and helps break down their biofilm. A significant advantage is that it quickly degrades into water and oxygen, leaving no harmful chemical residuals or persistent odors, unlike chlorine. It is often preferred for its reduced environmental impact.
  
  
• Comparing Peroxide vs. Chlorine:
  • Advantages of Peroxide: Faster breakdown means less flushing is needed, no strong chlorine odor, byproducts are non-toxic (water and oxygen), and it is often considered more environmentally friendly.
    
    
  • Disadvantages of Peroxide: Can be more expensive than bleach, not as commonly used for continuous injection systems, and may require a higher concentration for similar effectiveness against very heavy infestations.
    
    

  
  

• Application Steps and Considerations: Similar to chlorine, a calculated amount of hydrogen peroxide (typically a 7% or 35% solution, diluted as appropriate) is introduced into the well and circulated through the plumbing. Retention times can sometimes be shorter due to its faster reaction rate, but sufficient contact (e.g., 6-12 hours) is still necessary for effective treatment. Always follow manufacturer guidelines for dosage and safety, as concentrated peroxide can be caustic. Thorough flushing is still required, though often less extensive than with chlorine.
  
  

Continuous Disinfection and Filtration Systems

For wells with persistent iron bacteria problems or high iron/manganese content, a one-time shock treatment may not be sufficient. Continuous treatment systems offer a long-term solution by preventing bacterial regrowth and removing oxidized minerals. To learn more about the best well water filtration systems, read our guide.

• Chemical Injection Systems (Chlorine or Peroxide Pumps): These automated systems continuously inject a small, precise amount of disinfectant (chlorine or hydrogen peroxide) into the well water as it is pumped into the home. This low-level, continuous treatment effectively oxidizes iron and manganese and kills bacteria before they can form significant biofilm, providing ongoing protection.
  
  
• Aeration Systems and Oxidation Filters: These are non-chemical solutions that introduce air (oxygen) into the water. This process oxidizes dissolved iron and manganese, causing them to precipitate out as solid particles. The oxidized iron and any dead bacteria are then removed by specialized filtration media. Common oxidation filters include Greensand filters (which often use potassium permanganate for regeneration), Birm filters, or even simple media filters paired with an aeration tank.
  
  
• Retention and Filtration Processes: For chemical injection and aeration systems, a retention tank is important. This tank provides adequate contact time for the chemical oxidizer or oxygen to react with the iron, manganese, and bacteria. Following the retention tank, a specialized filter removes the precipitated iron particles, dead bacteria, and any remaining chemical residuals, helping to ensure clean, clear water reaches your home.
  
  

Step-by-Step DIY Guide to Treating Iron Bacteria

If you are comfortable with basic home maintenance tasks, treating iron bacteria with a shock chlorination or peroxide method can be a manageable DIY project. Always prioritize safety and follow instructions carefully.

Materials You Will Need:

• Household bleach (5.25% or 8.25% sodium hypochlorite) or hydrogen peroxide (7% or 35% solution, for dilution)
  
  
• Protective gear (gloves, eye protection, old clothes)
  
  
• Measuring cup
  
  
• Large bucket or non-metallic container for mixing
  
  
• Garden hose
  
  
• Well brush (if accessible for manual scrubbing)
  
  
• Chlorine test strips (for post-treatment testing)
  
  
• BART test kit for post-treatment confirmation
  
  

Step 1: Assess and Prepare

• Identify symptoms: Confirm you are dealing with iron bacteria (slime, odor, stains).
  
  
• Test your water: Use a BART test kit to confirm bacterial presence. Knowing your well's depth and diameter is important for calculating the correct chemical dosage.
  
  
• Gather materials: Ensure you have all necessary chemicals, safety gear, and tools on hand.
  
  
• Inform household: Let everyone know that the water will be unusable for a period and may smell of disinfectant during the process.
  
  

Step 2: Physical Cleaning (If Possible)

• If your well design allows, use a well brush to physically scrub the inside of the casing, dislodging loose slime. For most DIYers, this step may not be feasible.
  
  
• Alternatively, you can heavily flush the system before adding chemicals to dislodge loose slime, but this is less effective than mechanical brushing.
  
  

Step 3: Shut Down and Drain

• Turn off power to your well pump at the breaker.
  
  
• Bypass any water softeners, carbon filters, or other treatment equipment that could be damaged by high chlorine or peroxide concentrations.
  
  
• Drain your pressure tank and hot water heater to empty them of untreated water and allow them to fill with the disinfectant solution during the treatment.
  
  

Step 4: Introduce Disinfectant

• Calculate dosage: Determine the correct amount of bleach or peroxide based on your well's dimensions and the desired concentration (e.g., aiming for approximately 200 PPM chlorine). Refer to product labels or online calculators for guidance.
  
  
• Pour carefully: Slowly pour the calculated amount of disinfectant directly into the well casing access point. For better distribution, you can dilute the concentrated chemical with several gallons of water in a clean bucket before pouring into the well.
  
  

Step 5: Circulate and Disinfect Plumbing

• Turn the well pump power back on.
  
  
• Run an outdoor spigot (preferably one closest to the well) until you can clearly smell the disinfectant. This circulates the solution into the well and pump.
  
  
• Next, go inside and systematically run all indoor faucets (hot and cold), flush toilets, run water through showers, washing machines (on a hot cycle), and dishwashers until you detect the strong disinfectant odor at each fixture. This ensures the chemical reaches all parts of your plumbing system.
  
  
• Once disinfectant is detected everywhere, shut off all faucets and the well pump.
  
  
• Allow contact time: Let the disinfectant stand in the well and plumbing system for the recommended contact time (e.g., 12-24 hours for chlorine, 6-12 hours for peroxide). Longer contact time, up to 24 hours, generally improves effectiveness.
  
  

Step 6: Flush the System Thoroughly

• After the contact time, turn the well pump back on.
  
  
• Start by running water from an outdoor spigot (avoiding discharge into your septic system or sensitive landscaping) at a moderate flow rate until the disinfectant odor is completely gone. This can take several hours, depending on well recovery and system size.
  
  
• Once the outdoor water is clear and odor-free, gradually flush all indoor fixtures, toilets, and appliances until no disinfectant odor is detected. Be patient; this step is important for safety and water quality.
  
  

Step 7: Retest Your Water

• Wait 1-2 weeks after flushing to allow any remaining chemical residuals to dissipate and for the well water to stabilize.
  
  
• Retest your water for iron bacteria using a BART test or by sending a sample to a professional lab. This confirms the treatment effectiveness. If symptoms persist or tests are positive, a second shock treatment or professional intervention may be necessary.
  
  

Preventing Iron Bacteria Recurrence in Your Well

• Regular Well Maintenance Practices: Annual well inspections by a licensed well contractor can help identify potential issues early. Preventative shock treatments (eg, annually or bi-annually) may be recommended, especially in areas historically prone to iron bacteria or if your well has a history of recurrence.
  
  
• Monitoring Water Quality: Routine testing for iron, manganese, and bacteria is a proactive measure. Detecting elevated levels of these indicators early allows for intervention before a full bacterial infestation takes hold. This practice helps in understanding your well's unique characteristics and adjusting maintenance plans accordingly.
  
  
• Optimizing Well System Design: Ensuring proper well construction, appropriate casing depth, and optimal pump placement can help minimize stagnant water zones within the well. This reduces ideal breeding grounds for bacteria. Sometimes, modifications to the well cap or casing can help prevent external contaminants from entering the system.
  
  
• Considering Continuous Treatment Systems: For persistent or severe issues, or if your well has naturally high iron content, installing a continuous disinfection system (such as a chlorine or hydrogen peroxide injection pump) or an aeration/oxidation filtration system provides ongoing protection. These systems continuously treat the water as it enters your home, preventing bacterial regrowth.
  
  
• Addressing Source Contamination: While challenging, identifying and mitigating any surface sources of iron, manganese, or bacterial infiltration into the groundwater near your well can offer a fundamental prevention strategy. This might involve improving drainage around the wellhead or addressing septic system issues in the vicinity.
  
  

Cost Considerations for Iron Bacteria Treatment

• DIY Treatment Costs: This is often the most budget-friendly option for initial treatment. Expenses primarily include:
  • Water testing kits (e.g., BART test: $40-50 per kit).
    
    
  • Chemicals (household bleach or hydrogen peroxide: $10-50, depending on concentration and quantity).
    
    
  • Basic tools and safety gear (gloves, eye protection: $10-30).
    
    
  • Total DIY cost typically ranges from $60 to $130 per treatment.
    
    

  
  

• Professional Service Expenses: Hiring a licensed well contractor or water treatment specialist will incur higher costs but provides expertise, specialized equipment, and often more thorough results. Costs can vary significantly:
  • Basic well shock and physical cleaning: $300-$800.
    
    
  • Comprehensive well rehabilitation (pulling pump, brushing, jetting, heavy chemical treatment): $1,000-$3,000+.
    
    
  • These costs will vary by region and the specific services provided by the contractor.
    
    

  
  

• Investment in Long-Term Systems: For continuous protection, installing advanced treatment systems represents a notable upfront investment but offers long-term peace of mind and protection against recurrence.
  • Chemical injection systems (pump, retention tank, filter): $1,500-$4,000+.
    
    
  • Aeration/oxidation filters (e.g., Greensand, Birm): $2,000-$5,000+.
    
    
  • Installation costs are typically included in these figures but can be itemized separately. These systems also have ongoing operational costs for chemicals or filter media replacement.
    
    

  
  

• Hidden Costs of Neglect: It is important to consider the potential costs of not treating iron bacteria. These can include:
  • Frequent plumbing repairs due to corrosion and blockages in pipes.
    
    
  • Premature replacements of water-using appliances (such as hot water heaters and washing machines).
    
    
  • Increased energy bills due to inefficient appliances that struggle with slime buildup.
    
    
  • Reduced property value due to water quality issues and unsightly staining.
    
    
  • These ongoing costs can quickly outweigh the investment in proper treatment.
    
    

  
  

Troubleshooting Common Iron Bacteria Issues

• When Treatment Does Not Seem to Work:
  • Insufficient Disinfectant Concentration: You might not have used enough chlorine or hydrogen peroxide for your well's volume or the severity of the infestation. Accurate measurement is important.
    
    
  • Inadequate Contact Time: The chemical solution needs sufficient time to kill the bacteria, especially those deep within biofilm layers. Shortened contact times can lead to incomplete eradication.
    
    
  • Deep-Seated Bacterial Colonies: Bacteria can colonize deep within the well's aquifer or in plumbing crevices, making them difficult to reach with a simple shock treatment.
    
    
  • Reinfection from Plumbing: If your entire plumbing system was not thoroughly disinfected, bacteria remaining in pipes can quickly re-colonize the well once fresh water is introduced.
    
    
  • Rapid Re-introduction: High natural levels of iron or manganese in the groundwater mean the bacteria's food source is constantly being replenished, leading to rapid regrowth.
    
    

  
  

• Dealing with Stubborn Stains and Slime:
  • For existing orange or red iron stains on fixtures, use commercially available iron stain removers (often oxalic acid-based) or a solution of white vinegar and baking soda. Always test in an inconspicuous area first to prevent damage.
    
    
  • Regular scrubbing with a mild abrasive cleaner can help remove slimy deposits from accessible surfaces.
    
    

  
  

• Re-Emergence of Symptoms: If symptoms reappear within weeks or months of treatment, it indicates a need for a more aggressive approach or a continuous prevention system. This often suggests that the root cause (constant food source, optimal growing conditions) has not been adequately addressed.
  
  
• Consulting a Professional: When DIY efforts are repeatedly unsuccessful, or if you are dealing with severe, complex, or rapidly recurring iron bacteria problems, it is advisable to call a licensed well contractor or water treatment specialist. They have the expertise, advanced testing capabilities, and specialized equipment (such as well cameras or high-pressure jetting tools) to diagnose and implement effective long-term solutions, including well rehabilitation or permanent treatment system installation.
  
  

Frequently Asked Questions About Iron Bacteria in Well Water

How do you kill iron bacteria in well water effectively?

The most effective methods to treat iron bacteria in well water involve a combination of physical cleaning of the well and plumbing, followed by chemical treatment like shock chlorination or hydrogen peroxide. For persistent issues, installing a continuous disinfection or iron filtration system is often the best long-term solution.

What causes iron bacteria in well water?

Iron bacteria thrive in water sources that contain dissolved iron or manganese and oxygen. They are naturally present in many groundwater environments and can be introduced into a well system during drilling, maintenance, or through surface water infiltration.

Is iron bacteria harmful to drink?

Iron bacteria are not considered pathogenic and do not directly cause illness from drinking water. However, the iron-rich slime they produce can harbor other harmful bacteria and makes water unpalatable — orange, metallic, or swampy tasting. Treat the problem promptly to prevent biofilm buildup from sheltering coliform or other pathogenic bacteria.

How often should you treat well water for iron bacteria?

The frequency of treatment depends on the severity of the initial problem, the natural iron or manganese content in your water, and your well's specific characteristics. Some wells may benefit from annual preventative shock treatments, while others with recurring issues might require a continuous disinfection system for ongoing control. Regular testing will help determine the optimal schedule.

What kills iron bacteria naturally?

"Natural" options for complete eradication are limited for active bacterial infestations. Aeration systems can help oxidize dissolved iron, making it easier to filter out, which can indirectly reduce iron bacteria's food source. However, for established bacterial colonies, chemical shock treatments with chlorine or hydrogen peroxide are typically the most effective ways to kill the bacteria.

Conclusion

Iron bacteria is manageable, but it doesn't respond to the same treatment as ordinary iron staining. The bacteria produce a slime biofilm that can re-establish itself if you only address the dissolved iron without killing the organisms.

For most households, the approach is:

1. Confirm with a BART test before committing to a treatment plan — visual symptoms alone can be misleading.
   
   
2. Shock chlorinate at 200 ppm (household bleach or hydrogen peroxide) to kill existing colonies throughout the well and plumbing. Effective for mild to moderate infestations.
   
   
3. Monitor and maintain. A single shock treatment often needs to be repeated annually. If the problem recurs within months, a continuous disinfection system (chlorine or hydrogen peroxide injection) is the more durable fix.
   
   

Severe or persistent infestations — where shock chlorination fails to hold for more than a few months — usually indicate heavy biofilm or a source problem deeper in the well. At that point, professional well cleaning paired with a continuous treatment system is worth the cost.

If you're also dealing with hardness or dissolved iron alongside iron bacteria, treat the bacteria first — a softener installed before iron bacteria treatment tends to get fouled by the biofilm. See our best water softener reviews for options once the bacteria is under control.