Hydrogen Sulfide Smell in Well Water Fix

Last updated: April 2026

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Quick Answer

Test your well water at least once every year for total coliform bacteria, nitrates, total dissolved solids, and pH level CDC Guidelines for Well Water Testing.
A positive total coliform test can mean your water is contaminated with E. coli, but not always Understanding Positive Coliform Tests.
If your test shows harmful germs, consider drinking bottled water and contact your local health department.
The U.S. Environmental Protection Agency's (EPA) rules that protect public drinking water systems do not apply to privately owned wells CDC Guidelines for Well Water Testing.

As a well owner, you are responsible for making sure your water is safe to drink. If your well water has a rotten egg smell, it often means hydrogen sulfide is present, which can point to bacterial activity in your well system. Unlike public water systems, private wells are not regulated, treated, or monitored by government officials, as the U.S. Environmental Protection Agency's (EPA) rules do not apply to them CDC Guidelines for Well Water Testing. This means regular testing is crucial. We recommend testing your well water at least once every year for key indicators like total coliform bacteria, nitrates, total dissolved solids, and pH level. If you find contaminants, it's important to retest to confirm and then work with your local health department to make your water safe.

Why Does My Well Water Smell Like Rotten Eggs?

A rotten egg smell in your well water is a common sign of hydrogen sulfide gas. This gas often forms when certain bacteria, known as sulfur-reducing bacteria, are active in your well, water heater, or plumbing system. These bacteria thrive in environments without oxygen and use sulfur as an energy source, producing hydrogen sulfide as a byproduct. While hydrogen sulfide itself is not typically harmful at low levels, its presence can indicate other underlying water quality issues, especially the potential for bacterial contamination. Understanding the source of this smell is the first step toward addressing it effectively.

Your Responsibility as a Well Owner

Unlike homes connected to public water systems, private well owners have a unique responsibility for their water quality. Government officials do not regulate, treat, or monitor tap water from private wells, meaning the U.S. Environmental Protection Agency's (EPA) rules that protect public drinking water systems do not apply to privately owned wells CDC Guidelines for Well Water Testing. This lack of external oversight means that you, as the well owner, are solely responsible for testing your well to ensure the water is safe to drink. This responsibility extends to understanding potential contaminants, conducting regular tests, and taking action when issues arise. Your local government can assist you in getting your well water tested, but the initiative and follow-through remain yours.

Water Quality Indicators and Their Importance

The rotten egg smell is an important indicator, but it’s just one piece of the puzzle. Water quality indicators, such as coliforms, pH, and total dissolved solids, are crucial for understanding if your water may contain harmful germs or chemicals. These indicators are typically not harmful themselves. Instead, they signal that your water might be contaminated with something else that could make you sick. For instance, a high total coliform count can indicate that harmful germs, including certain viruses, bacteria, and parasites, might also be present in your water. Coliform bacteria live in people's and animals' digestive systems, in soil, on plants, and in surface water like lakes or rivers. While these bacteria generally will not make you sick, they often enter your water the same way as disease-causing germs, making them much easier to test for and serving as a warning sign CDC Guidelines for Well Water Testing. Monitoring these indicators helps you stay ahead of potential health risks and maintain a safe water supply for your household. Addressing the hydrogen sulfide smell may involve treating the bacteria causing it, which often improves overall water quality.

Addressing the Smell: Initial Steps

When you first notice the rotten egg smell, a few initial steps can help you pinpoint the source. First, try to determine if the smell is present only in hot water or in both hot and cold water. If it's only in hot water, the problem might be in your water heater, where sulfur-reducing bacteria can thrive. If the smell is in both hot and cold water, the issue is likely within the well itself or your main plumbing lines. You can also check if the smell is present only at certain faucets, which could point to localized plumbing issues. Regardless of where you detect the smell, the most important step is to conduct comprehensive water testing. This testing will not only confirm the presence of hydrogen sulfide but also check for other potential contaminants that could be a health risk. Without proper testing, any attempts to fix the smell are just guesswork.

The Role of Bacteria in Hydrogen Sulfide Production

The rotten egg smell is primarily caused by hydrogen sulfide gas, which is often a metabolic byproduct of certain bacteria. These bacteria are typically found in environments where oxygen is scarce, such as deep within well systems, in water heaters, or in parts of plumbing systems where water can stagnate. They consume sulfates (naturally occurring compounds in water) and convert them into hydrogen sulfide gas. This process is not always harmful on its own, but the presence of these bacteria can be linked to other types of bacterial contamination. For example, some coliform bacteria, which are indicators of potential fecal contamination, can also contribute to or be present alongside sulfur-reducing bacteria. Therefore, identifying the specific types of bacteria present in your water through laboratory testing is critical. This helps determine if the issue is merely an aesthetic nuisance or if it indicates a more serious health risk that requires immediate action. Understanding the microbial ecosystem in your well is essential for developing an effective treatment plan.

What Should I Test My Well Water For?

To ensure your well water is safe, you should test it at least once every year. This regular testing helps you monitor for changes in water quality that might not be visible or detectable by smell. Because private wells are not regulated by the EPA, you are responsible for these crucial tests.

Key Annual Water Quality Tests

We recommend that you test your well water at least once every year for a few key indicators CDC Guidelines for Well Water Testing. These include:

Total coliform bacteria: These bacteria are "indicator organisms." Their presence suggests that disease-causing microorganisms might be able to enter your water system. While many coliforms are harmless, they indicate a potential pathway for pathogens. If the total coliform count is high in your water, it is likely that harmful germs—including certain viruses, bacteria, and parasites—are also in your water CDC Guidelines for Well Water Testing.
Nitrates: High levels of nitrates can be dangerous, especially for infants, and can indicate contamination from fertilizers, septic systems, or animal waste.
Total dissolved solids (TDS): This measures the concentration of all inorganic and organic substances dissolved in water. High TDS can affect the taste, odor, and appearance of your water, and can also indicate the presence of other contaminants.
pH level: The pH measures how acidic or alkaline your water is. An imbalanced pH can lead to corrosion of plumbing or other issues, and can affect the effectiveness of certain water treatments.

These yearly tests provide a baseline understanding of your water's health and can help you identify problems early.

Localized Testing Recommendations

Beyond the annual tests, it's smart to contact your local health department or environmental department. They can provide specific guidance on what other germs or chemicals to test for based on where you live CDC Guidelines for Well Water Testing. Local conditions, such as nearby agricultural activity, industrial sites, or geological features, can introduce specific contaminants to groundwater. For example, if you live near an area with common agricultural runoff, your health department might suggest testing for pesticides or herbicides. If there are known issues with heavy metals in your region, they might recommend tests for lead, arsenic, or iron. These localized recommendations are vital because they target specific risks relevant to your area, offering a more comprehensive picture of your well water's safety. Relying on local expertise ensures that your testing regimen is tailored to your unique circumstances, offering peace of mind that you are addressing the most pertinent threats to your water quality.

Using a State-Certified Laboratory

When you collect water samples for testing, it is critical to use a state-certified laboratory. These laboratories follow strict protocols to ensure accurate and reliable results. A state certification means the lab meets certain quality standards and is approved to perform drinking water analyses. Using an uncertified lab could lead to inaccurate readings, causing you to either miss a serious contamination issue or undertake unnecessary and costly treatments. Your local health department can help you find a certified lab in your area. They can also help you understand your test results and what steps you should take next based on the findings CDC Guidelines for Well Water Testing. The accuracy of your water test is the foundation for any remediation efforts, so investing in professional, certified testing is a non-negotiable step for any well owner concerned about the safety of their drinking water.

Understanding Test Results and Next Steps

Once you receive your test results, it is important to review them carefully. Your local health department is a valuable resource for interpreting these results. They can explain what the different levels mean and whether any contaminants pose a health risk. If your test results show that there are harmful germs or chemicals in your well water, you should consider drinking bottled water or another safe source of water immediately CDC Guidelines for Well Water Testing. This is a critical safety measure to protect your household while you work on a solution. The health department can then help you understand what to do next to make your well water safe to drink. They may recommend specific treatment options, such as shock chlorination, or suggest that you test your well water more often to monitor the effectiveness of any changes you implement. Proactive engagement with these resources ensures that you are taking informed steps to secure your water supply.

Beyond Standard Tests: Specific Concerns

Sometimes, the rotten egg smell itself might prompt additional, more specific tests. While the annual tests cover broad indicators, if hydrogen sulfide is consistently present, you might want to test specifically for sulfur-reducing bacteria. These tests can help confirm if bacterial activity is indeed the primary cause of the smell. Furthermore, if you suspect any other specific contaminants due to local environmental factors or changes in your well's performance, do not hesitate to discuss these with your health department or the certified lab. They can guide you on specialized tests for things like pesticides, volatile organic compounds (VOCs), or heavy metals that are not part of the routine annual panel. This proactive approach ensures that all potential threats to your well water's quality are identified and addressed.

What Do Coliform Bacteria in My Well Water Mean?

Coliform bacteria in your well water serve as an important warning sign, indicating that your water may be vulnerable to contamination. These bacteria are a large family that includes many kinds, some harmless and others that can cause serious illness. Their presence means a pathway exists for potentially dangerous microorganisms to enter your water system.

Understanding Coliforms: Indicator Organisms

Coliforms are a family of bacteria that occur naturally in various environments. You can find them in soil and decaying vegetation, but also in the intestines of warm-blooded animals, including humans What to do about Coliform Bacteria in Well Water. The presence of coliforms on a water test indicates the potential presence of disease-causing microorganisms in water – or, at least, that a pathway exists for those bacteria to enter the water. This is why they are often referred to as "indicator organisms" Understanding Positive Coliform Tests. They are much easier to test for than specific pathogens, making them a practical and effective way to screen for potential contamination. A positive total coliform test doesn't automatically mean your water is dangerous, but it does mean you need to take further action to investigate. It signals a breach in your well's integrity or a potential source of contamination nearby.

Harmless vs. Harmful Coliforms

Many coliforms are completely harmless. These non-fecal coliform bacteria are commonly found in the environment and do not pose a direct threat to human health. However, the coliform group also includes fecal coliforms, such as E. coli. These are the ones that can make people sick. Fecal coliforms like E. coli can cause symptoms that include diarrhea, cramps, nausea, and headaches, and can even lead to kidney failure Understanding Positive Coliform Tests. This is why a positive coliform test should be taken seriously, especially if infants, young children, the elderly, or people with compromised immune systems live in or frequently visit the household. The distinction between harmless and harmful coliforms is crucial, and further testing is needed to identify which types are present.

Fecal Coliforms and E. coli: A Clear Danger

If your water tests positive for fecal coliforms or E. coli, it means your water has definitely come into contact with human or animal waste. People's and animals' poop contain millions of these bacteria CDC Guidelines for Well Water Testing. One species of fecal coliform bacteria is Escherichia coli (E. coli). "If E. coli or other fecal coliform bacteria are in well water, the water has come into contact with human or animal waste and could cause disease," according to Joel Pigg, John W. Smith, and Diane E. Boellstorff of the Texas Well Owner Network What to do about Coliform Bacteria in Well Water. While many types of E. coli are usually harmless, some specific types can make you seriously sick. A positive test for fecal coliforms or E. coli strongly suggests that harmful germs from feces have entered your well water. This situation requires immediate action to identify the source of contamination and treat your water.

Potential Sources of Contamination

The presence of coliform bacteria, especially fecal coliforms, indicates a breach in your well system's integrity or contamination from nearby sources. Common sources include:

Failing septic systems: A leaking or improperly functioning septic system can allow human waste to seep into groundwater.
Agricultural runoff: Animal waste from farms can wash into wells, especially after heavy rains.
Surface water intrusion: Cracks in the well casing, a damaged well cap, or improper well construction can allow surface water, which may contain bacteria, to enter the well.
Flooding: Floodwaters can carry contaminants directly into wells.
Poor well maintenance: Infrequent cleaning or maintenance can allow bacteria to establish colonies.
Contaminated sampling: Sometimes, the water sample itself can be contaminated during collection. This is why retesting is so important.

Identifying the source of contamination is a critical step in fixing the problem permanently. Without addressing the source, any treatment you apply will likely only be a temporary solution.

The Link to Hydrogen Sulfide

While coliforms themselves don't directly cause the rotten egg smell, the conditions that allow coliforms to enter your well can also support the growth of sulfur-reducing bacteria. For example, if surface water is intruding into your well, it could introduce both fecal matter (and thus coliforms) and organic material that sulfur-reducing bacteria can feed on. A compromised well system that allows bacterial entry is often an environment where various types of bacteria can thrive. Therefore, a positive coliform test, especially alongside a rotten egg smell, should prompt a comprehensive investigation into the integrity of your well and potential sources of contamination. Treating your well for coliforms often involves shock chlorination, which can also help eliminate the sulfur-reducing bacteria causing the hydrogen sulfide smell.

What Should I Do If My Water Tests Positive for Coliforms?

If your well water tests positive for total coliforms, it's natural to be concerned, but the first step is to avoid panic. A positive total coliform test doesn't always mean your water is contaminated with E. coli, but it does require immediate follow-up to ensure your water's safety.

Retest to Confirm Contamination

"First of all, don’t panic! Yes, a positive total coliform test can mean your water is contaminated with e-coli, but not always," according to Home Water Purifiers and Filters Understanding Positive Coliform Tests. The very first action you should take is to retest to confirm the contamination. It is possible that the initial water sample was contaminated during the collection process, as coliform bacteria are very common in the environment What to do about Coliform Bacteria in Well Water. A retest provides crucial validation, helping to confirm if there's a genuine issue with your well water or if the initial result was a false positive due to handling. This step helps prevent unnecessary alarm and potentially costly treatments.

Specific Testing for Fecal Coliform or E. coli

When you conduct the retest, it is essential to collect another water sample and have it tested specifically for fecal coliform bacteria or E. coli What to do about Coliform Bacteria in Well Water. While total coliforms can indicate that something may be wrong with the well, their presence does not necessarily mean the water has come into contact with human or animal waste. However, the presence of fecal coliform or E. coli in water definitely indicates contamination by contact with human or animal waste What to do about Coliform Bacteria in Well Water. This distinction is vital because fecal contamination poses a much higher and more immediate health risk, requiring more urgent and aggressive treatment strategies. This targeted retesting helps clarify the severity of the contamination.

Accurate Sample Collection is Key

To get an accurate retest result, you must carefully follow the laboratory’s instructions for collecting a new water sample What to do about Coliform Bacteria in Well Water. Proper collection techniques minimize the chance of contaminating the sample itself, ensuring that the test reflects the actual quality of your well water. Before collecting water, remove any aerator, filter, or hose from the faucet you plan to use. These attachments can harbor bacteria and skew your results. Wash your hands thoroughly, and be extremely careful not to touch the inside of the sample container or the inside of its cap. Touching these surfaces can introduce bacteria from your skin, leading to a false positive. Running the water for a few minutes before collecting the sample can also help flush out any stagnant water in the plumbing. Following these precise steps is critical for obtaining reliable test results.

Interpreting Confirmed Results

If the retest confirms the presence of fecal coliforms or E. coli, it's time to take more serious action. This confirms that your well water is indeed contaminated with harmful bacteria from human or animal waste. At this point, you should immediately stop drinking the well water and use an alternative safe source, such as bottled water. Contact your local health or environmental department right away. They can help you understand the implications of these results and guide you through the next steps for treating your well and identifying the source of contamination. They may also recommend that you test your well water more often after treatment to ensure its ongoing safety.

Addressing the Source of Contamination

Treating the water without addressing the source of contamination will only provide a temporary fix. You will need to investigate how fecal matter is entering your well. This could involve inspecting your well casing for cracks, checking the well cap for damage, examining nearby septic systems for leaks, or assessing potential runoff from agricultural areas. Sometimes, simple repairs to your well infrastructure can prevent future contamination. In other cases, more extensive work, such as well disinfection (e.g., shock chlorination), might be necessary to eliminate existing bacteria. Working with a qualified well professional can help you diagnose the entry point and implement the most effective long-term solution.

How Can I Treat My Well Water for Contaminants?

Treating your well water for contaminants, especially after a positive coliform test or the presence of a hydrogen sulfide smell, involves a multi-step approach that prioritizes safety and long-term solutions. The specific treatment depends on the type and level of contamination found in your water tests.

Immediate Safety Measures

If your water tests confirm the presence of harmful germs or chemicals, the most important immediate step is to consider drinking bottled water or another safe source of water CDC Guidelines for Well Water Testing. This protects everyone in your household from potential health risks while you work on a permanent solution. This is not a long-term fix but a critical safety measure to implement immediately upon receiving confirmed positive results for dangerous contaminants like fecal coliforms or specific types of E. coli. Boiling your water can also kill most harmful bacteria and viruses, making it safe for consumption in the short term, but it is energy-intensive and not practical for all water uses.

Consulting with Local Authorities

Your local health or environmental department is an invaluable resource for guidance on making your well water safe CDC Guidelines for Well Water Testing. They can help you interpret complex test results, understand the specific health risks associated with the identified contaminants, and recommend appropriate treatment strategies based on local regulations and common issues in your area. These experts can also advise on how to identify and eliminate the source of contamination, which is often the most crucial step for a lasting solution. For example, if the contamination is due to a faulty septic system, they might recommend repairs or replacement. If it's due to wellhead damage, they can suggest well contractors. They may also recommend that you test your well water more often after treatment to ensure that the problem has been resolved and your water remains safe.

Disinfection Methods for Bacterial Contamination

For bacterial contamination, such as coliforms or E. coli, shock chlorination is a common and effective treatment. This involves introducing a strong chlorine solution into your well and plumbing system to kill bacteria. The chlorine is left in the system for several hours or overnight before being flushed out. It's a powerful method to disinfect the entire well and distribution system. However, shock chlorination is a temporary solution if the source of contamination is not addressed. If the well casing is cracked, or the well cap is compromised, new bacteria can enter the system after treatment. Therefore, shock chlorination should ideally be performed after any necessary repairs to the well infrastructure. Following shock chlorination, retesting for bacteria is essential to confirm its effectiveness.

Addressing Hydrogen Sulfide (Rotten Egg Smell)

If the primary issue is the rotten egg smell caused by hydrogen sulfide, there are several treatment options.

Aeration: Introducing air into the water can oxidize the hydrogen sulfide gas, converting it into elemental sulfur, which can then be filtered out. This method is effective for moderate levels of hydrogen sulfide.
Chlorination: Similar to bacterial disinfection, chlorine can oxidize hydrogen sulfide. This can be done through continuous injection of a small amount of chlorine into the water system, followed by a filter to remove any residual chlorine and sulfur particles.
Manganese Greensand Filters: These filters contain a special media that oxidizes and filters out iron, manganese, and hydrogen sulfide. They often require regeneration with potassium permanganate.
Activated Carbon Filters: While effective for removing many odors and tastes, activated carbon is generally better for lower levels of hydrogen sulfide and may require frequent replacement or backwashing.
Water Softeners: While primarily designed to remove hardness minerals like calcium and magnesium, some advanced water softeners can also help reduce low levels of hydrogen sulfide. Companies like Culligan offer well water softeners that can transform your water, addressing hard water which is a common problem for well owners Well Water Softeners | Culligan. These systems are designed to provide cleaner, soft water, which can improve taste and extend the life of appliances. Culligan also offers a range of well water treatment solutions specifically for well owners Well Water Treatment | Culligan.

Long-Term Water Treatment Systems

For ongoing water quality issues, installing a permanent water treatment system might be necessary. These systems can include:

Whole-house filtration systems: These can range from simple sediment filters to more complex multi-stage filters that address various contaminants.
UV disinfection systems: Ultraviolet light systems kill bacteria and viruses by disrupting their DNA, preventing them from reproducing. These are highly effective for microbiological contamination but do not remove chemicals or improve taste/odor.
Reverse osmosis (RO) systems: Often used for drinking water at the tap, RO systems can remove a wide range of contaminants, including dissolved solids, heavy metals, and some organic chemicals.
Chemical injection systems: These systems continuously inject chemicals like chlorine or hydrogen peroxide to oxidize contaminants like iron, manganese, and hydrogen sulfide.

When considering a treatment system, it's advisable to consult with water treatment professionals. Companies like Culligan offer various water treatment systems designed to provide pure, clean, and safe water Culligan Water Treatment Systems | Culligan. They can assess your specific water quality issues and recommend a system tailored to your needs. Proper installation and regular maintenance of any treatment system are crucial for its effectiveness and longevity.

Are There Specific Types of E. coli I Should Worry About?

Yes, while many types of E. coli are generally harmless and live naturally in the intestines of warm-blooded animals, some specific types can make you seriously sick. It's important to understand this distinction, especially when interpreting water test results.

The Broad Spectrum of E. coli

E. coli is a part of the fecal coliform group of bacteria. Fecal coliforms and E. coli are usually harmless CDC Guidelines for Well Water Testing. They are naturally present in the digestive systems of humans and animals and are often used as indicators of fecal contamination in water because they are abundant and relatively easy to detect. A positive test for E. coli in your well water means that poop has gotten into your water, and with it, there is a risk that harmful germs from that poop might also be present. However, the standard water quality indicator test for E. coli does not differentiate between the harmless strains and the dangerous ones.

Dangerous Strains of E. coli

Some specific types of E. coli can make you seriously sick CDC Guidelines for Well Water Testing. The most well-known dangerous strain is E. coli O157:H7, which is often associated with severe foodborne illness outbreaks. This particular strain produces toxins that can cause severe abdominal cramps, bloody diarrhea, and vomiting. In severe cases, it can lead to a type of kidney failure called hemolytic uremic syndrome (HUS), which can be life-threatening, especially for young children and the elderly. Other pathogenic E. coli strains can cause different types of illness, including traveler's diarrhea or urinary tract infections. The key takeaway is that a basic E. coli test simply tells you if E. coli is present, not which specific strain it is.

Limitations of Standard E. coli Tests

A water quality indicator test for E. coli will not show whether the water contains the dangerous types of E. coli CDC Guidelines for Well Water Testing. These routine tests are designed to detect the presence of the broader E. coli group as an indicator of fecal contamination. They are not specific enough to identify individual strains or their pathogenic potential. This means that even if your water tests positive for E. coli, you won't know from that test alone if the specific strain present is one that could cause serious illness. This limitation highlights the importance of taking any E. coli positive result seriously, regardless of whether you know the specific strain.

When to Suspect Dangerous E. coli and What to Do

If you suspect your water is contaminated with a dangerous type of E. coli, you will need to use a more specific type of test to find it CDC Guidelines for Well Water Testing. Suspicion might arise if people in your household develop severe gastrointestinal symptoms consistent with E. coli infection, especially after a confirmed positive E. coli water test. In such cases, it is crucial to contact your local health department immediately. They can provide guidance on specialized testing that can identify specific pathogenic strains. Additionally, if you have a confirmed E. coli positive result in your well water and anyone in your household is experiencing symptoms, seek medical attention promptly. Continue to use bottled water or a safe alternative until the issue is fully resolved and retesting confirms the water is safe.

Proactive Measures

Given the potential for dangerous E. coli strains, proactive measures are paramount for well owners. Regular annual testing for total coliforms and E. coli is your first line of defense. If E. coli is detected, regardless of the specific strain, it indicates a breach in your well's protection and a potential health risk. This should trigger an immediate investigation into the source of contamination and appropriate disinfection of your well. Maintaining your well's integrity, ensuring proper well cap sealing, and preventing surface runoff from entering the well are all critical steps to minimize the risk of fecal contamination and, by extension, exposure to dangerous E. coli strains.

Frequently Asked Questions

How often should I test my well water?

You should test your well water at least once every year for total coliform bacteria, nitrates, total dissolved solids, and pH level CDC Guidelines for Well Water Testing. Regular annual testing is crucial because private wells are not regulated by the EPA, making you responsible for your water's safety. Your local health department can also advise on additional tests based on your area's specific risks.

What does a positive total coliform test mean?

A positive total coliform test indicates the potential presence of disease-causing microorganisms in your water, or at least that a pathway exists for them to enter Understanding Positive Coliform Tests. While many coliforms are harmless, a high count suggests that harmful germs, including certain viruses and parasites, might also be present. You should retest specifically for fecal coliforms or E. coli to confirm contamination.

Are all coliform bacteria harmful?

No, not all coliform bacteria are harmful. Many coliforms occur naturally in soil and decaying vegetation and are completely harmless. However, fecal coliforms, like E. coli, can cause sickness with symptoms such as diarrhea, cramps, nausea, and headaches, and can even lead to kidney failure Understanding Positive Coliform Tests. The presence of fecal coliforms or E. coli definitely indicates contact with human or animal waste.

Who is responsible for ensuring my private well water is safe?

As a water well owner, you are solely responsible for testing your well to make sure the water is safe to drink CDC Guidelines for Well Water Testing. Government officials do not regulate, treat, or monitor tap water from private wells, as EPA rules for public drinking water systems do not apply. Your local government can assist with testing, but the responsibility lies with you.

What steps should I take if my well water has a rotten egg smell?

If your well water has a rotten egg smell, which often indicates hydrogen sulfide, start by testing your water for common indicators like total coliforms, nitrates, total dissolved solids, and pH level. If tests show harmful germs, consider drinking bottled water and contact your local health or environmental department for guidance on specific treatments. They may also recommend more frequent testing after any treatment CDC Guidelines for Well Water Testing.