Why Orlando Tap Water Can Smell Like a Pool (And What a Chlorine Switch Is)

If your tap water suddenly smells like a swimming pool, you are smelling chlorine. In the Orlando area that is usually not a seasonal switch: OUC treats with ozone and then chlorine and states that it does not use chloramines, and Toho Water Authority's FAQ says only chlorine is added to its water, and its 2025 water quality reports list chlorine as the disinfectant in every system except Harmony, which reports chloramines (tohowater.com/waterquality). Utilities that do use chloramine run periodic free chlorine conversions to flush their pipes; on a chlorinated system, the chlorine level simply varies from place to place and week to week. Here is what is happening and how to remove the taste at home with the right kind of carbon filter.

Chloramine versus free chlorine, the basics

Every municipal water system in Central Florida disinfects the water before it leaves the treatment plant. The disinfectant has to stay active all the way through miles of distribution pipe so that the water reaching your kitchen tap is still microbiologically safe. Two chemistries do that work: free chlorine and chloramine. The large utilities around Orlando mostly use free chlorine. OUC treats with ozone and then chlorine, Orange County Utilities lists chlorine for each of its systems in its 2025 water quality report, and Toho Water Authority lists chlorine in every 2025 report except its Harmony system, which reports chloramines.

Free chlorine is what most of us picture when we think of pool water. It is a fast, aggressive disinfectant that reacts quickly with anything organic. It also has that unmistakable swimming-pool smell because free chlorine off-gasses readily from open water and reacts with skin oils, hair proteins, and any organic film inside the plumbing.

Chloramine is chlorine combined with a small amount of ammonia. The reaction produces a much more stable molecule (monochloramine) that lasts longer in the pipes and produces far fewer trihalomethane and haloacetic-acid disinfection byproducts than free chlorine. At normal maintained levels, chloramine has much less odor than free chlorine, so people on chloraminated systems rarely notice the disinfectant in their water.

That is why the swimming-pool smell is so obvious when a chloraminated system switches to free chlorine for a few weeks: residents are not used to it. On a system that uses free chlorine year round, such as OUC or most of Toho, a stronger smell usually means the chlorine level at your tap is higher than usual. Toho's 2025 reports show individual chlorine readings from 0.5 to 3.1 ppm across its systems, and OUC gives an average of 1.0 ppm.

Why utilities switch, the nitrification problem

Chloramine is the better year round disinfectant for one reason and the worse year round disinfectant for another. The good: it is stable, long-lasting, and produces few regulated byproducts. The bad: when chloramine concentration drops too low somewhere in the distribution system (a dead-end main, a low-flow neighborhood, a long stretch of pipe in summer heat), the ammonia portion of the molecule becomes available to nitrifying bacteria.

Those bacteria convert the ammonia first to nitrite and then to nitrate. The process is called nitrification, and once it gets a foothold in a section of pipe it accelerates: the bacteria consume more chloramine, the disinfectant level falls further, and the bacterial colony grows. The American Water Works Association documents nitrification as the single most common operational headache for utilities that run on chloramine year round.

The textbook fix is a periodic free chlorine conversion. The utility temporarily switches the disinfectant from chloramine back to plain free chlorine. Free chlorine kills the nitrifying bacteria, oxidizes the accumulated biofilm on pipe walls, and resets the distribution system. Once the conversion period ends, the utility returns to chloramine and the system runs cleanly for another year. The EPA recognizes the practice and describes it in guidance for chloraminated systems.

Which Central Florida systems this applies to

OUC does not use chloramines, so it has no chloramine-to-chlorine conversion to schedule. Toho Water Authority's FAQ says only chlorine is added to its water, and its 2025 water quality reports list chlorine as the disinfectant in every system except Harmony, which reports chloramines (tohowater.com/waterquality). If you are on Harmony water, or on any other system whose water quality report lists chloramines, that utility sets and announces its own conversion window.

Other utilities in the region each choose their own disinfectant and, if they use chloramine, their own conversion windows. Some announce the dates in advance on the utility website; others post a notice only after the conversion begins. The disinfectant your utility uses is listed in its annual water quality report, and the utility hotline can tell you whether a conversion is under way.

During a conversion on a chloraminated system, the disinfectant residual in the pipes is free chlorine, still below the EPA maximum of 4 mg/L. Some hydrants are flushed during the same window, which can stir up sediment in the mains and produce a brief discolored-water episode in some neighborhoods. The discoloration is cosmetic and clears within a few minutes of running the cold tap.

What you will notice at home

The pool-water smell is the obvious signal, but a higher chlorine level shows up in a few other ways too. Reading the pattern helps confirm that what you are smelling comes from the utility and not from a problem inside your house.

Smell: A clear chlorine note at the cold tap, strongest first thing in the morning before the line has flushed. The smell intensifies in a steamy shower because warm water releases more free chlorine to the air.

Taste: A sharper, more medicinal taste in drinking water and in anything you make with tap water, especially tea and coffee. Some people notice it more in ice cubes than in the freshly poured glass.

Hair and skin: Drier skin after showering, a duller feeling in long hair, and a noticeable difference in how shampoo lathers. Free chlorine is rougher on keratin than chloramine.

Aquariums and ponds: Dechlorinator doses differ for free chlorine and chloramine. Read the bottle and dose for the disinfectant your utility lists. If you keep fish, this is the most important check on this list.

Kidney dialysis at home and certain medical equipment: If a household member uses home dialysis or any equipment with a chloramine-removal pre-treatment, the equipment vendor's protocol almost always covers both chemistries, but it is worth confirming with the clinical team which disinfectant your utility uses.

For the broader Central Florida disinfection picture, including how Toho and OUC compare on byproducts and source water, see our chloramine vs ozone background piece and the Kissimmee and Orlando water quality guide.

Is it safe? Yes.

Utility chlorine levels, including during a conversion, must stay inside the EPA Maximum Residual Disinfectant Level of 4 mg/L. That is the same regulatory ceiling that applies to free chlorine in any U.S. water system, including the dozens of large utilities that run on free chlorine year round. The water is microbiologically safer during the conversion, not less safe, because the higher-redox disinfectant is actively scrubbing the distribution system.

The aesthetic effects (taste, smell, hair feel) are real but are not health effects. The EPA's secondary drinking-water guidance recognizes the taste and odor as nuisance factors at residuals above roughly 0.6 to 1 mg/L. Utilities that run conversions announce them for exactly this reason: so residents who notice the change have context and do not assume something has gone wrong with the supply.

Two narrow exceptions, both already covered above: keep aquariums and any medical equipment on the correct dechlorination protocol for whichever disinfectant the utility is currently using. Everything else, drinking, cooking, bathing, laundry, lawn watering, runs the same as the rest of the year.

The fix at home, the right kind of carbon

If the pool-water smell bothers you (or if you want the chlorine or chloramine residual gone year round for taste, hair, and skin reasons), point of entry carbon filtration is the answer. The catch is that the carbon has to match the disinfectant.

Standard granular activated carbon (GAC) removes free chlorine fast. A 10-inch GAC cartridge can knock free chlorine to non-detect at typical residential flow rates with empty-bed contact times under a minute. On a free chlorine system such as OUC or most Toho systems, standard GAC is the right media, and an under-sink GAC stage on the kitchen tap covers drinking water for the cost of a single cartridge change.

Catalytic carbon is GAC that has been steam-activated to give the carbon surface enzymatic activity for breaking the chloramine molecule apart. Catalytic carbon removes chloramine effectively at residential contact times. Standard GAC does not; it will adsorb a small fraction and then leak chloramine through the bed. If you are on a chloraminated system, such as Toho's Harmony system, catalytic carbon is the right whole-house media because it handles both chloramine and the free chlorine used during a conversion. A typical whole-home stack uses a 1 to 1.5 cubic-foot carbon tank ahead of the softener.

A few practical notes on sizing. The whole-house catalytic carbon tank should be sized to your peak flow, not your average flow. A family-of-four house with two showers running at once needs about 8 to 10 gpm of capacity at the carbon stage; undersizing pushes contact time below what catalytic carbon needs to break chloramine cleanly. The carbon bed in a properly sized residential tank typically runs 5 to 7 years before media change. If your stack already includes carbon and a chlorine smell is still bleeding through, the bed is exhausted and is the priority service item.

For an under-sink-only solution, a reverse osmosis system with a quality carbon pre filter and a carbon post-filter removes both chloramine and free chlorine from drinking water specifically, even if the rest of the house still gets the chlorine smell at the shower. The RO guide covers point of use chemistry; the hard water guide covers the upstream softener question.

Recommended method: matching the situation to the fix

What you have at home	What you notice	Right fix
OUC or most Toho city water (chlorine), no whole-house filter	Chlorine smell at the taps, strongest in a hot shower	Whole-home carbon stack sized to peak flow; standard GAC handles free chlorine
Chloraminated city water (for example Toho's Harmony system) with a standard GAC stage	A flat chemical taste that the GAC does not remove	Replace the GAC bed with catalytic carbon at the next service
City water with under-sink RO only, no whole-house filter	Drinking water tastes fine, shower and laundry smell like chlorine	Add a point of entry carbon stage (catalytic on chloraminated supply); keep the RO for drinking water polish
Aquarium or pond keeper	Fish stress, cloudy water, or unexplained fish loss after a water change	Confirm dechlorinator dose for both free chlorine and chloramine; consider a dedicated dechlor stage on the fill line
Vacation home or short term rental sitting empty	Heavy chlorine smell when guests arrive, brown water at first flush	Flush every fixture 3 to 5 minutes before guest arrival; install whole-home carbon for unattended periods
Private well on Floridan Aquifer (no city disinfection)	No utility disinfectant, but other diagnostics may apply	See the Florida well water guide for the well-specific stack

Call a professional if...

• A strong chlorine smell lasts for weeks. Report it to your utility. The cause may be local to your part of the distribution system, or it may be inside your house.
• The smell is concentrated at one bathroom, not whole-house. That points to a branch-line or fixture issue (a contaminated showerhead biofilm, a dead-leg in the plumbing), not the utility chemistry.
• You see brown or yellow water at the cold tap. Most likely a hydrant-flush event in your neighborhood; if it does not clear in 30 minutes of flushing, call the utility and report it.
• Your aquarium fish show stress or loss after a water change. Stop using straight tap water for changes until you confirm dechlorinator dosing for free chlorine, and consider a dedicated dechlor pre-stage.
• Your carbon stack is older than 6 to 7 years and the chlorine smell is breaking through. The media bed is at end of life; the fix is a media change, not adding more equipment.
• You have eczema, asthma, or chemical sensitivity and notice a flare when the chlorine smell is strong. Document the timing for your physician and prioritize point of entry carbon filtration year round.
• You run a home dialysis unit or any medical equipment with a chloramine pre-treatment. Confirm the manufacturer's protocol with your clinical team, and ask your utility which disinfectant it uses.

Frequently asked questions

What to do next

If you have noticed a pool-water smell and you want it gone, the first step is a free in-home water test. The Pure Agua Enterprises team will measure chloramine or free chlorine at the kitchen tap, hardness, iron, and pH, confirm which utility serves your address, and tell you whether a catalytic carbon stage on its own is enough or whether a full softener-plus-catalytic stack makes more sense for your home. Family-owned since 2016, 200+ five-star reviews, a WQA member, NSF/ANSI 58 and 61 systems, Florida licensed.

Background reading on Central Florida water: the Central Florida hard water guide, the Florida well water guide, the RO drinking water guide, the Kissimmee and Orlando water quality guide, the Floridan Aquifer hard water article, the chloramine vs ozone background, the rotten-egg smell diagnostic, the general smell and staining diagnostic, the complete softener guide, the Central Florida softener cost guide, the vacation rental water guide, the 200 installs patterns piece, the service area page, the about page, the financing options, and the FAQ.

Call (407) 773-2883 or request your free in-home water test. We arrive with a calibrated chlorine and chloramine test, a hardness test, and a pH meter. Test on the spot, written diagnosis, no pressure.