**Boise Gut: Is Chlorinated Water Killing Good Bacteria?**

By Franklin Everett Shaw

August 4, 2025

It’s easy to take for granted the simple act of drinking a glass of water. But what if that seemingly innocuous act was subtly altering the very ecosystem within you? In Boise, Idaho, where the majestic Rockies meet the high desert, our municipal water supply, while safe, undergoes chlorination – a process that, while essential for public health, might be impacting the delicate balance of our gut microbiome. Let’s dive into how Boise’s water treatment could be affecting your gut, and what you can do about it.

Chlorine, a powerful disinfectant, is added to Boise’s water supply to kill harmful bacteria and viruses. This ensures the water is safe to drink and prevents waterborne illnesses. However, chlorine doesn’t discriminate; it can also harm beneficial bacteria in our gut. These beneficial bacteria, collectively known as the gut microbiome, play a crucial role in digestion, immunity, and even mental health.

The impact of chlorinated water on the gut microbiome is a complex and ongoing area of research. Some studies suggest that long-term exposure to chlorinated water can lead to a reduction in the diversity and abundance of beneficial gut bacteria. This disruption, known as dysbiosis, has been linked to various health problems, including irritable bowel syndrome (IBS), allergies, and even autoimmune diseases.

Boise residents who rely on municipal water are constantly exposed to chlorine. This is in contrast to those who use well water, which is typically free of chlorine. This difference in water source could potentially lead to variations in the gut microbiome composition between these two groups. While no specific study has directly compared the gut biomes of Boise residents based on their water source, it’s a plausible hypothesis worth exploring.

So, what can Boiseans do to mitigate the potential negative effects of chlorine on their gut microbiome? The answer lies in water filtration. Fortunately, Boise offers a variety of readily available water filtration options.

• Activated Carbon Filters: These filters are highly effective at removing chlorine and other contaminants from water. You can find them in pitcher filters (like Brita or PUR), faucet filters, and whole-house filtration systems at stores like Home Depot on Franklin Road or Lowe’s on Milwaukee Street.
• Reverse Osmosis (RO) Systems: RO systems are more comprehensive filtration solutions that remove a wider range of contaminants, including chlorine, fluoride, and heavy metals. These systems are typically installed under the sink and can be purchased from plumbing supply stores like Ferguson on Federal Way.
• Shower Filters: Don’t forget about the chlorine you absorb through your skin while showering! Shower filters, available at stores like Bed Bath & Beyond in the Boise Towne Square Mall, can remove chlorine and other chemicals from your shower water.

Choosing the right filtration system depends on your budget and needs. A simple pitcher filter might suffice for occasional drinking water, while a whole-house system provides comprehensive filtration for all water sources in your home. Remember to replace filters regularly according to the manufacturer’s instructions to ensure optimal performance.

Beyond water filtration, dietary strategies can also play a significant role in promoting a healthy gut microbiome. Focusing on foods that support beneficial bacteria is key.

• Prebiotics: These are non-digestible fibers that feed beneficial bacteria in the gut. Good sources of prebiotics include onions, garlic, asparagus, bananas, and oats. Locally, you can find high-quality onions and garlic at the Boise Farmers Market during the growing season.
• Probiotics: These are live microorganisms that add beneficial bacteria to the gut. Fermented foods like yogurt, kefir, sauerkraut, and kimchi are excellent sources of probiotics. Look for locally made yogurt and sauerkraut at the Boise Co-op.
• Fiber-Rich Foods: A diet rich in fiber promotes a diverse and healthy gut microbiome. Include plenty of fruits, vegetables, and whole grains in your diet. The Treasure Valley is known for its delicious produce, so take advantage of the local farmers markets and grocery stores.

It’s important to note that individual responses to dietary changes can vary. What works for one person may not work for another. Experiment with different foods and pay attention to how your body responds.

One common mistake people make is drastically changing their diet without gradually introducing new foods. This can lead to digestive discomfort and may even worsen gut symptoms. Start slowly and gradually increase your intake of prebiotic and probiotic-rich foods.

Another pitfall is relying solely on supplements to improve gut health. While probiotic supplements can be helpful, they are not a substitute for a healthy diet and lifestyle. Focus on getting your nutrients from whole foods whenever possible.

For those who are curious about the state of their gut microbiome, testing is an option. While comprehensive gut microbiome testing can be expensive, it can provide valuable insights into the composition of your gut flora.

Here’s a step-by-step guide to getting your gut biome tested locally:

1. Consult with a Healthcare Professional: Talk to your doctor or a registered dietitian about your gut health concerns and whether gut microbiome testing is appropriate for you. They can help you interpret the results and develop a personalized plan to improve your gut health.
2. Choose a Testing Company: Several companies offer gut microbiome testing services. Research different companies and compare their testing methods, pricing, and reporting. Some popular options include Viome, Thryve, and Biohm.
3. Order a Test Kit: Once you’ve chosen a testing company, order a test kit online. The kit will typically include instructions for collecting a stool sample and a prepaid shipping label for returning the sample to the lab.
4. Collect Your Sample: Follow the instructions carefully to collect your stool sample. It’s important to collect the sample correctly to ensure accurate results.
5. Send Your Sample to the Lab: Package your sample according to the instructions and ship it to the lab using the prepaid shipping label.
6. Receive Your Results: The lab will analyze your sample and provide you with a report detailing the composition of your gut microbiome. This report will typically include information about the abundance of different types of bacteria, as well as personalized recommendations for improving your gut health.
7. Interpret Your Results: Work with your healthcare professional to interpret your results and develop a plan to address any imbalances in your gut microbiome. This plan may include dietary changes, supplements, and lifestyle modifications.

While there aren’t specific labs in Boise that perform the analysis, many offer sample collection kits that you mail to their facilities. Your doctor can also order a test through a national lab.

The cost of gut microbiome testing can range from $100 to $500 or more, depending on the testing company and the complexity of the analysis. Insurance coverage for gut microbiome testing is often limited, so be sure to check with your insurance provider before ordering a test.

Ultimately, maintaining a healthy gut microbiome is a multifaceted endeavor. It requires a conscious effort to minimize exposure to harmful substances like chlorine, nourish beneficial bacteria with a diverse diet, and address any underlying imbalances through testing and personalized interventions. As Boise residents, we have access to the resources and knowledge necessary to take control of our gut health and thrive in our unique Intermountain West environment.