Treating Iron, Manganese, and Coliform Bacteria in Well Water

Have you ever noticed metallic smells in your water? Buildup on faucets and fixtures? Or worse—felt sick after drinking your tap water?

We hope the answer to all three is “no.” But if not, your water may be contaminated with iron, manganese, or, even more concerning, iron or coliform bacteria.

Iron bacteria thrive in oxygen-deprived (anaerobic) environments like wells, while coliform bacteria—often from fecal matter—can make their way into water supplies, especially near farms, sewage runoff, or deposits of coal, peat, and oil.

Common Causes and First Steps to Take

We recently received a question from a reader living near a cattle ranch who was dealing with strange smells, buildup, and concerns about coliform contamination. Our advice? Start with well protection.

Make sure your wellhead is secure so surface water can’t enter. A professional inspection can ensure the well seal isn’t damaged or missing. In some cases, older wells can be resealed or reconditioned to prevent contamination.

Effective Treatment Options for Iron and Bacteria

Once the well is secure, we recommend installing a chlorine injection system with a metering pump. This setup uses liquid chlorine to kill bacteria and oxidize iron and manganese, turning them into filterable particles.

Add a contact tank next to give the chlorine time to work. Then follow it with a Pro-OX filter to remove the oxidized particles and reduce staining and buildup on your fixtures. You can also install a carbon filter to eliminate any lingering chlorine taste or odor.

Final Step: Total Disinfection

To ensure total bacteria removal, install a UV sterilizer at the final stage of your system. UV treatment is one of the most effective chemical-free methods for neutralizing waterborne bacteria.

See the installation diagram below to visualize how these systems come together. By protecting your well and using this combination of filters and disinfectants, you’ll drastically improve your water’s safety, taste, and clarity.

Introduction to Well Water Contamination

For private well owners, ensuring the safety of your water supply is a top priority. Well water contamination can pose serious health risks, especially when it comes to bacterial contamination and the potential for diseases caused by disease-causing organisms. One of the most common threats is the presence of coliform bacteria, which includes total coliform bacteria, fecal coliform bacteria, and E. coli. These indicator bacteria can find their way into your well water through a variety of routes, such as surface water runoff, human or animal waste, and even improper well construction. The presence of coliform bacteria in your water system is a clear indicator that your well water may be at risk for contamination by disease-causing organisms. Testing for indicator bacteria, such as coliforms and E. coli, is a practical way to assess the microbial safety of your water supply and detect disease-causing organisms.

Regular testing for coliform bacteria is essential for private well owners, as it helps detect potential problems early and ensures that your water system remains safe and healthy for you and your family. Test your well at least once a year to prevent waterborne diseases, especially for higher-risk groups like children and the elderly. Collect and analyze water samples regularly to check for indicator bacteria.

Human activity and surface bacteria often cause contamination by entering the well, increasing the risk of polluted water.

Understanding Bacterial Contamination

Bacterial contamination in well water happens when coliform bacteria—such as total coliform, fecal coliform, and E. coli—enter the water supply. These indicator bacteria signal possible microbial contamination and the need for disease control to prevent waterborne illnesses. While most coliform bacteria aren’t harmful themselves, their presence suggests that disease-causing organisms may be present.

Fecal coliform bacteria, including E. coli, originate from warm-blooded animals’ intestines and often indicate contamination from human or animal waste. This contamination can cause serious illness, especially in vulnerable individuals. The Environmental Protection Agency recommends regular testing for total coliform, fecal coliform, and E. coli.

Prevent contamination by ensuring proper well construction, maintaining safe distances from animal waste and septic systems, and routinely testing your well water.

Health Risks Associated with E. Coli

E. coli, a specific type of fecal coliform bacteria, is a major concern for drinking water safety. Its presence in well water indicates contamination by human or animal waste, which can introduce harmful disease-causing microorganisms.

Some strains, like E. coli O157:H7, can cause severe illness. Risks increase with shallow wells, poor well construction, or nearby septic tanks. Animal waste and surface runoff also contribute to contamination.

The Environmental Protection Agency advises private well owners to test for total coliform bacteria and E. coli annually or more often if problems arise. If detected, shock chlorination and avoiding drinking the water until it is retested are critical.

Prevent contamination by ensuring proper well construction with a secure casing and cap, and locating wells away from septic systems and animal areas. Regular maintenance and inspections help prevent issues.

Boiling water kills bacteria but does not remove chemical contaminants and may concentrate them. Additional treatment may be needed for chemical safety.

Identifying Contamination Sources

Pinpointing the source of bacterial contamination is a crucial step in protecting your drinking water. Common contamination sources include surface water runoff, human or animal waste, malfunctioning septic systems, and improper well construction. Possible causes of contamination can also include less obvious factors, so collecting water samples for laboratory analysis is essential for accurate identification. Private well owners should routinely inspect their wells and the surrounding area for signs of surface water intrusion or other vulnerabilities.

Reviewing well construction and maintenance records can also help identify potential issues that may compromise water quality. Regularly testing your water for coliform bacteria is essential for detecting changes in water quality and identifying contamination sources early. By staying vigilant and addressing these contamination sources promptly, you can help ensure that your well water remains safe and free from harmful bacteria.