Blog: Expert Insights on Water Quality & Treatment

In Seattle, Tacoma, Kitsap County, and surrounding Puget Sound communities, most utilities rely on chloramine rather than chlorine to disinfect drinking water. It helps protect public health across large distribution systems—but for homeowners, it often creates lingering taste and odor issues that basic filters can’t solve. At Pure Water Northwest, we regularly hear from families frustrated that their water still smells “like a swimming pool” or makes coffee and tea taste flat even after installing a filter. In this article, we’ll explain the difference between chlorine and chloramine, why standard carbon filters usually fall short, and how a reverse osmosis water filter in Kingston and across the Puget Sound delivers consistently clean, great-tasting results.

Chlorine vs. Chloramine: Why It Matters

Municipal water systems use disinfectants to keep drinking water safe from microbes. Traditionally, chlorine has been the standard. It reacts quickly to neutralize bacteria and viruses, but it can dissipate fast—sometimes too fast for large distribution systems. That’s where chloramine comes in.

Chloramine is simply chlorine mixed with a small amount of ammonia. Utilities in Seattle, Tacoma, and Kitsap County use it because, as the CDC explains, it lasts longer in the pipes—protecting homes miles from the treatment plant. But that same stability is exactly why small filters often struggle: chloramine needs more contact time and specialized carbon media to break it down. The EPA also notes that chloramine can react with plumbing metals and still cause the very issues homeowners notice most—lingering chemical taste, flat coffee or tea, and even skin or eye irritation for some families.

Does a Carbon Filter Remove Chloramine?

The honest answer: not very well, unless the filter is specifically built for it. Standard activated carbon cartridges do a great job at reducing chlorine’s taste and odor. That’s why so many pitcher filters and refrigerator cartridges advertise “chlorine reduction.” But chloramine is a different story. As the Water Quality Association points out, chloramine molecules are more stable and require a stronger reaction site on the filter media. The Water Research Foundation has also documented that meaningful chloramine reduction often requires three to four times more contact time than chlorine.

That’s why results vary so widely between products. A small cartridge in a faucet mount or pitcher may “polish” chloramine, but will rarely bring levels down enough for taste, odor, or skin issues to disappear. Whole-home catalytic carbon systems, on the other hand, can be engineered with:

• Media type: Catalytic carbon, which has been chemically treated to provide more reactive sites, making it far more effective against chloramine than standard activated carbon.
• Contact time: A larger carbon bed and slower water flow dramatically increase exposure time. The WRF has found that short contact time is the number-one reason small filters underperform.
• System design: Multi-stage filters that combine catalytic carbon with other media, or full-sized whole-home tanks, ensure consistent results when properly sized for a household’s flow rate.

Without these conditions, many filters only take the “edge” off chloramine—removing part of the disinfectant but leaving enough behind to flatten the taste of coffee and tea, dry out skin, or leave an odor in drinking water. That’s why so many Northwest families are surprised to learn that their carbon filter may only be doing half the job.

How to Remove Chloramine from Tap Water Effectively

For families in the Northwest who want predictable, high-quality results, reverse osmosis (RO) is the gold standard. Unlike a single filter cartridge, a modern RO system uses a multi-stage process that combines specialized carbon filters, a semi-permeable membrane, and a final polishing stage. Each layer plays a role in removing what chloramine leaves behind.

According to peer-reviewed studies, RO membranes act as one of the most effective barriers against chloramine byproducts and a wide range of other dissolved contaminants. But it’s not the membrane alone that matters—it’s the way RO systems are designed to stack protections:

• Carbon prefilters (ideally catalytic carbon) go to work first, reacting with chloramine to reduce its impact and protecting the delicate RO membrane from chemical wear.
• The RO membrane physically separates water molecules from a wide spectrum of impurities, including chloramine byproducts, nitrates, arsenic, and heavy metals—contaminants that municipal treatment isn’t designed to remove at the tap.
• Post-filters provide a final polish, removing any lingering taste and ensuring every glass of water is crisp and refreshing.
• Pairing RO with whole-home catalytic carbon offers the strongest defense. A whole-home tank reduces chloramine throughout the plumbing, protecting skin, hair, and appliances, while the under-sink RO ensures drinking and cooking water is purified to the highest level. Together, this combination delivers complete protection from the shower to the kitchen faucet.

This layered approach explains why RO is widely regarded as the most reliable solution for how to remove chloramine from tap water. It doesn’t just tackle the disinfectant itself—it also shields against a wide range of other impurities that municipal systems leave behind. For families who want water that tastes great, protects their plumbing, and supports long-term health, RO combined with whole-home filtration gives you better than bottled-water quality right at your tap.

Why Northwest Homeowners Need to Pay Attention

In Puget Sound communities, chloramine is the disinfectant of choice because it lasts longer in pipes than chlorine. That helps utilities protect public health across large, complex service areas—but it also brings tradeoffs that affect families at home. Many homeowners notice the taste and odor issues first: water that smells like your swimming pool, coffee and tea that tastes weak or off, no matter how you brew it, or skin that feels dry even after using a filter. But the concerns don’t stop at aesthetics.

Meanwhile, the Washington Department of Ecology points out that residual disinfectants like chloramine do nothing to address “emerging contaminants of concern,” such as pharmaceuticals or PFAS, that are showing up more often in state water quality reports. In other words, chloramine solves one problem but leaves others untouched.

That’s why many Northwest families add protection at the tap. Municipal chloramine is designed to keep water safe as it travels through pipes, not to guarantee that it’s clean, great-tasting, and free of every contaminant by the time it reaches your glass. A homeowner-focused solution like reverse osmosis adds that extra layer of defense—giving peace of mind where city treatment stops.

Choosing the Right Solution for Your Home

Every Northwest home has its own water story. Some families in Kingston and Bainbridge Island are dealing with chloramine taste and odor. Others in Tacoma or Seattle live in older homes where plumbing materials make water quality concerns even more complex. That’s why at Pure Water Northwest, we don’t believe in “one-size-fits-all.” We start with a professional water test, then design solutions around your household’s needs, plumbing, and long-term goals.

Here are some of the approaches we often recommend:

• Under-sink reverse osmosis (RO) systems:

  Ideal for families who want better than bottled water quality for drinking and cooking. These multi-stage systems remove chloramine byproducts and other contaminants right at the tap, so your coffee, tea, and meals taste the way they should, and you don’t have to worry about drinking other common contaminants.

• Whole-home catalytic carbon tanks:

  Designed to reduce chloramine at every faucet and shower. Many homeowners notice softer skin, healthier hair, and less chemical odor throughout the house. These systems are often paired with RO in the kitchen for the best of both worlds.

• Ongoing maintenance and monitoring:

  Even the best system only performs when it’s maintained. Our team handles filter changes, membrane checks, and flow rate adjustments so your investment continues to protect your home year after year.

The right setup for your family depends on your water source, your plumbing, and your priorities. See if we serve your community, then schedule your free water quality test to get personalized recommendations—not just generic solutions.

Still Tasting Chloramine in Your Water?

If your coffee never tastes quite right, your tap water smells “pooly,” or your skin feels dry after a shower, it may not be your imagination—chloramine is likely slipping past your filter. Studies cited by the EPA and CDC show why this disinfectant is so persistent in Northwest water systems, and why standard carbon filters often leave families frustrated.

That’s where reverse osmosis paired with whole-home catalytic carbon comes in. This combination addresses chloramine throughout your plumbing and delivers bottled-water quality right at your kitchen tap—so every glass tastes fresh, every meal is made with clean water, and your home is protected inside and out.

Pure Water Northwest has been helping families across Kingston, Bainbridge, Seattle, and Tacoma take control of their water quality. We start with testing, explain your results in plain English, and design a right-sized solution that fits your home—not a generic fix.

Further Reading

• EPA: Chloramines in Drinking Water
• CDC: Water Disinfection with Chlorine and Chloramine
• WQA: Chloramine Information
• Water Research Foundation: State of the Science on Chloramines
• ScienceDirect: Peer-Reviewed Research on Chloramine
• WA Dept. of Ecology: Emerging Contaminants