Why Does Tap Water Taste Like Chlorine? Its Role and What a Filter Can Do

You pour a glass of water and notice that familiar smell before the first sip. Or you notice it while filling your bottle: a chlorine taste that makes the water less appealing.

It is natural to wonder whether something is wrong. It is also reasonable to want water whose taste you enjoy more.

To decide what to do, start by understanding why chlorine is used in water and what noticing it at home means.

Why is chlorine added to water?

Chlorine is used as a disinfectant: it helps eliminate microorganisms that can cause illness. A small amount remains in the water to keep protecting it as it travels through pipes to your tap. This amount is called residual chlorine.

Its presence serves a public health purpose. Treatment must keep disinfectant levels within established limits and monitor the quality of distributed water. Source: CDC

Does smelling chlorine mean there is too much?

Smell alone cannot determine whether the concentration exceeds a limit. An appropriate measurement is needed.

Chlorine-treated water may taste and smell different from water without that disinfectant. Changes in concentration or water characteristics can change how it is perceived. Your supplier can explain the treatment it uses and help investigate changes. Source: CDC

So saying “it smells like chlorine” describes an observation; saying “it has too much chlorine” requires verification.

What to do if the smell suddenly changes

If the smell becomes much stronger than usual, persists or appears alongside a color change, seek advice before attributing everything to chlorine.

You can gather useful information without tasting the water:

• Note when it started and whether it happens continuously.
• Observe whether it occurs at one tap or several.
• Check for service interruptions or recent work.
• Check notices from IDAAN or your supplier and the Ministry of Health for your community.

Reporting a change in smell, color or taste helps the supplier guide the investigation. If testing is needed, ask a laboratory about appropriate tests and sample collection. Source: EPA

During a health advisory, follow official instructions even if you have a filter. Improving the smell does not demonstrate that the problem behind the advisory has been resolved. Source: CDC

How can a filter help with chlorine taste?

When water is safe to drink and you want to improve its taste or smell, a filter designed to reduce chlorine may be an option.

Activated carbon is used for this purpose. Passing water through an appropriate device can reduce some of the taste you dislike. Performance depends on the product’s design and conditions of use. Source: CDC

To choose, look for specific information about chlorine, taste and odor reduction. The phrase “contains activated carbon” alone does not tell you how much it reduces or how long it works.

One reference you may encounter is NSF/ANSI 42, a standard related to effects such as taste and odor. If a product claims certification, verify the model and the specific reduction included. That standard does not mean the filter removes all contaminants or microorganisms. Source: NSF

The same precision applies to disinfectants: chlorine reduction and chloramine reduction are different capabilities that must be verified in the device’s documentation. Source: NSF

If chlorine protects water, why reduce it at home?

Disinfection during distribution and filtration before drinking serve different purposes.

A point-of-use filter, such as a pitcher or a kitchen device, can improve the taste of the water you serve. After filtering, keeping the device and containers clean also matters.

This deserves particular attention if you are considering a whole-home system: removing disinfectant before water travels through indoor pipes may encourage microorganisms to grow in them. Your choice should consider maintenance and your household’s needs. Source: CDC

Store water in clean, covered containers suitable for that purpose. Avoid putting hands or utensils inside, and keep them protected from sunlight and chemicals. Source: CDC

What if chlorine taste returns while I am already using a filter?

That is a reason to check the device, although it does not by itself confirm that the cartridge is exhausted.

Check the installation date, stated capacity, accumulated use and maintenance instructions. Filter media have a service life and need replacing according to the manufacturer’s instructions. Source: EPA

Ask yourself:

• Is this the correct cartridge for the model?
• Has it reached the specified time or volume limit?
• Am I using the device as instructed in the manual?
• Is the change also noticeable in unfiltered water?

If the problem continues, consult the filter supplier. If you notice a change in the supply, also report it to your water provider.

Choose according to how you use water

Perhaps you fill a bottle before leaving home. Maybe you make coffee several times a day or keep a pitcher in the fridge for the whole family.

Start with that routine and what you want to improve. Then review what the model you are considering can do, what evidence supports it and how it is maintained.

At PFC, we want to help you understand those differences so you can make an informed choice and enjoy the water that accompanies your day.

Have questions about chlorine taste? Explore PFC’s options and tell us how you use water at home. We can explain our products’ features and care.

Free your water with PFC.

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