Chloramine vs. Chlorine in Municipal Water: What's the Difference?

If you notice a change in your tap water, it could be due to the type of disinfectant used by your local water utilities - chlorine or chloramine. Both chemicals are designed to keep water safe; however, there is a difference in how they affect taste, odor, and overall water quality. To make an informed decision about filtration, it's important to understand these differences so you can ensure your household water meets your preferences and needs.

Why Water Utilities are Switching from Chlorine to Chloramine

For decades, chlorine has been the go-to disinfectant in municipal water systems due to its being highly effective at killing harmful bacteria and viruses. However, many water utilities have begun to use chloramine (a combination of chlorine and ammonia) as a longer-lasting alternative.

Chloramine is stable and remains in the water as it travels through miles of distribution pipes, unlike chlorine, which evaporates relatively quickly. This durability helps maintain disinfection all the way to your tap, which in turn reduces the risk of microbial contamination in large, complex systems.

Another key driver behind this shift is that, compared to chlorine alone, chloramine tends to produce fewer traditional disinfectant byproducts.

How Chloramine Affects Taste, Odor, and Health

One of the noticeable differences between chlorine and chloramine is how they affect the taste and smell of your water. Chlorine has a strong scent, which is often described as a "swimming pool" smell. Chloramine, on the other hand, has a milder, less noticeable odor which many people find more pleasant.

From a health standpoint, both chlorine and chloramine are considered safe at regulated levels. However, for certain individuals, chloramine can be more irritating. Some people experience dry skin, eye irritation, or even respiratory discomfort, particularly when showering, where water vapor is inhaled. Chloramine is also known to be harmful to fish and aquatic pets, so it must be removed from water used in aquariums.

Chloramine and the Formation of New Disinfection Byproducts

While chloramine reduces the formation of some traditional byproducts associated with chlorine, it can lead to the creation of different compounds. One group that causes concern is nitrogen-containing disinfection byproducts, which are the result of chloramine reacting with organic matter in the water. These byproducts are still in the research phase, but some studies have indicated that they may pose health risks with long-term exposure.

Their levels are carefully monitored and controlled by water utilities, but their presence highlights the complexity of balancing effective disinfection with overall water quality.

Can Standard Carbon Filters Remove Chloramine?

Standard activated carbon filters are effective at removing chlorine, but don't work as efficiently with chloramine. This is down to chloramine's stability and not breaking down so easily. Some carbon filters can slightly reduce chloramine, but this requires much longer contact time or a specialized carbon media to be truly effective. Simply running water through a typical filter won't fully remove it.

This is important for homeowners to know, as many assume all filters perform the same way. If your water supply uses chloramine, you'll need a system specifically designed to handle it.

The Best Treatment Options for Chloramine-Treated Water

To remove chloramine from your water supply, you'll need to invest in advanced filtration methods:

Catalytic Carbon Filters: One of the most popular options, these are specially treated to break the bond between chlorine and ammonia, making chloramine easier to remove.
Reverse Osmosis (RO) Systems: A highly effective solution that uses a semipermeable membrane to remove a wide range of contaminants, when paired with the right pre-filters.
Multi-Stage Filtration Systems: Recommended for whole-house treatments, these systems treat water at the point of entry, improving both drinking water and water used for bathing and cleaning.

A whole-house chloramine removal system ensures that every tap in your home delivers improved water quality. For the most comprehensive solution, a reverse osmosis treatment system provides superior chloramine removal along with protection against other contaminants.

The right system for you depends on your water usage, budget, and level of concern, but overall will make a noticeable difference in your water's taste, smell, and overall quality. Contact a trusted chloramine filtration expert to find the best solution for your household needs.