Chicago's Chlorine: Is Tap Hurting Your Gut Bugs?

By Franklin Everett Shaw

January 24, 2026

Ever wonder why your tap water in Chicago tastes a little…off? It’s not just your imagination. The city’s water, while treated to meet safety standards, contains chlorine, a disinfectant that, while effective, can wreak havoc on your gut health. But don’t despair, fellow Chicagoans! You don’t have to resign yourself to a life of digestive distress. This is your hyper-local guide to navigating Chicago’s water and protecting your precious microbiome.

Chlorine, added to our water supply to kill harmful bacteria and viruses, doesn’t discriminate. It eliminates both the bad and the good bacteria in your gut. This disruption can lead to a range of issues, from bloating and gas to weakened immunity and even long-term health problems.

So, how do you know how much chlorine is in your Chicago tap water? The City of Chicago publishes water quality reports, but these are averages across the entire system. Your building’s age and plumbing can significantly impact chlorine levels at your tap.

Here’s how to take matters into your own hands:

Invest in a Chlorine Test Kit: You can find these at most hardware stores or online retailers like Amazon. Look for kits specifically designed for testing drinking water. A good option is the Hach 4800000 Total Chlorine Test Kit.
Follow the Instructions Carefully: Each kit will have its own specific instructions, but generally, you’ll collect a water sample and add a reagent that changes color based on the chlorine concentration.
Compare the Color to the Chart: The kit will include a color chart that allows you to estimate the chlorine level in your water. Aim for a reading as close to zero as possible.

Now that you know how to test, let’s talk about filtration. Not all water filters are created equal. To effectively remove chlorine, you need a filter certified to do so.

Here’s what to look for when choosing a water filter in Illinois:

NSF/ANSI Standard 42 Certification: This certification ensures the filter has been tested and proven to reduce chlorine, taste, and odor. Look for this specifically on the packaging.
Filter Type: Activated carbon filters are the most effective at removing chlorine. Options include:
- Pitcher Filters: Brands like Brita and PUR offer pitchers with activated carbon filters. While convenient, they may not remove as much chlorine as other options.
- Faucet Filters: These attach directly to your faucet and provide filtered water on demand. They’re a good mid-range option.
- Under-Sink Filters: These are installed under your sink and connect to a separate faucet. They offer the highest filtration capacity and are a great long-term solution.
- Whole-House Filters: These filter all the water entering your home, protecting your gut health (and your skin and hair!) from chlorine exposure in showers and baths.
Filter Replacement Frequency: Pay attention to how often the filter needs to be replaced. Some filters last longer than others, which can impact the overall cost.

Pro Tip for Chicago Residents: Consider the age of your building’s plumbing. Older pipes can leach lead into the water, so look for filters certified to remove lead as well (NSF/ANSI Standard 53).

But what if you’re on the go, or simply want to explore other ways to hydrate and support your gut health? Here are some alternative hydration strategies:

Filtered Water Bottles: Invest in a reusable water bottle with a built-in filter. This is a great option for staying hydrated on the go.
Herbal Teas: Many herbal teas are naturally hydrating and can provide additional health benefits. Look for teas that support gut health, such as ginger, peppermint, or chamomile.
Kombucha: This fermented tea is a great source of probiotics, which can help replenish the good bacteria in your gut. Choose low-sugar varieties to avoid unwanted side effects.
Bone Broth: Rich in collagen and amino acids, bone broth can help heal and seal the gut lining. Look for organic, grass-fed options.
Electrolyte Drinks (Homemade): Skip the sugary sports drinks and make your own electrolyte drink with water, lemon juice, a pinch of sea salt, and a touch of honey or maple syrup.

Common Mistakes and Pitfalls:

Assuming All Filters Are Equal: As mentioned earlier, not all filters remove chlorine effectively. Always check for NSF/ANSI Standard 42 certification.
Not Replacing Filters Regularly: A clogged filter can actually increase the concentration of contaminants in your water. Follow the manufacturer’s instructions for filter replacement.
Relying Solely on Bottled Water: Bottled water can be expensive and environmentally unfriendly. Plus, some bottled water is simply tap water that has been filtered.
Ignoring Other Sources of Chlorine Exposure: Chlorine can also be absorbed through the skin during showers and baths. Consider a shower filter to reduce your overall exposure.
Not Addressing Underlying Gut Issues: While filtering your water is a great first step, it’s important to address any underlying gut health issues with a healthcare professional.

Real-World Scenario: The Lincoln Park Resident

Let’s say you live in a charming brownstone in Lincoln Park. Your building is over 100 years old, and you’re concerned about both chlorine and lead in your water. You test your tap water and find elevated levels of both.

Here’s your action plan:

Install an Under-Sink Filter: Choose a filter certified to remove both chlorine (NSF/ANSI Standard 42) and lead (NSF/ANSI Standard 53).
Consider a Shower Filter: To reduce chlorine exposure during showers, install a shower filter.
Incorporate Gut-Friendly Hydration: Start your day with a glass of filtered water with lemon, and sip on herbal tea throughout the day.
Consult a Healthcare Professional: If you’re experiencing persistent gut issues, consult a doctor or registered dietitian to rule out any underlying conditions.

By taking these steps, you can protect your gut health and enjoy the peace of mind that comes with knowing you’re drinking clean, safe water. Don’t let Chicago’s tap water get you down. Take control of your hydration and your health!