If you live in Kissimmee or Orlando, your tap water travels a unique path from source to faucet, and understanding that path is the first step toward knowing what treatment (if any) your home actually needs. Central Florida's water comes primarily from the Floridan Aquifer, but the utility serving your home determines the specific treatment, blending, and quality characteristics you experience.
Where Kissimmee Water Comes From
Toho Water Authority supplies drinking water to Kissimmee, St. Cloud, Poinciana and unincorporated parts of Osceola County. Kissimmee Utility Authority (KUA) is the city's electric utility, not its water utility. The primary source is the Floridan Aquifer, a massive limestone formation underlying all of Central Florida. As water passes through this limestone over thousands of years, it dissolves calcium and magnesium, creating the hard water that defines Central Florida's water quality.
Kissimmee water hardness: Toho Water Authority does not list a hardness figure in its 2025 water quality reports, so an in-home test is the way to get your number. For reference, the Water Quality Association classifies anything above 10.5 GPG as "very hard." Most Kissimmee homes without treatment experience visible scale on fixtures within months of moving in.
Disinfection: 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). Standard carbon filters remove free chlorine quickly; on the Harmony system, catalytic carbon media is needed to remove chloramine.
Hydrogen sulfide: Many Kissimmee residents notice a rotten-egg odor in their water, particularly first thing in the morning. This is hydrogen sulfide (H₂S) naturally present in Osceola County groundwater. While not a health hazard at typical residential concentrations, it affects taste, corrodes metal plumbing, and tarnishes silverware.
Where Orlando Water Comes From
Orlando Utilities Commission (OUC) and Orange County Utilities serve different parts of the Orlando metro area, and each publishes its own water quality report:
OUC source and treatment: OUC says its water comes from the Lower Floridan Aquifer and is treated with ozone and then chlorine. It states that the average hardness of its water is 129 ppm, about 7 GPG, and that it does not use chloramines (ouc.com/about/water-services).
Disinfection byproducts: OUC's annual Water Quality Report lists its total trihalomethane (TTHM) results. TTHMs are a regulated group of byproducts that form when chlorine reacts with natural organic matter in the water.
PFAS monitoring: OUC's 2025 Water Quality Report found no detectable PFAS (per- and polyfluoroalkyl substances) in its October 2024 and April 2025 UCMR5 monitoring (OUC 2025 report). Orange County Utilities, a separate utility, shows PFOS at 4.6 to 5.0 parts per trillion at its Malcolm Road and CR 535 entry points in 2024 on its PFAS test results page. The EPA's 2024 Maximum Contaminant Level for PFOA and PFOS is 4 parts per trillion each, judged on a running annual average, and its health-based goal for both is zero.
What the Consumer Confidence Reports Don't Tell You
Your annual water quality report from Toho or OUC shows compliance with EPA standards, that's its purpose. What it doesn't address:
- What happens in your pipes: Water quality at the treatment plant differs from water at your tap. Older distribution mains and home plumbing can add lead, copper, and sediment between the treatment plant and your glass.
- Aesthetic quality: Hardness, taste, and odor are secondary standards, utilities aren't required to fix them. Your water can be "safe" while still damaging your appliances and tasting unpleasant.
- Emerging contaminants: The EPA regulates approximately 90 contaminants. The Environmental Working Group's database identifies over a dozen compounds in Central Florida water that exceed health based guidelines but are legal under current EPA rules.
What Central Florida Homeowners Should Test For
Whether you're on OUC, Toho, or any Central Florida municipal water, a comprehensive in-home water test reveals what's actually coming out of your specific tap, not what the utility measures at the plant. Pure Agua Enterprise tests for:
- Total hardness (GPG), determines if and what size softener you need
- Chloramine levels, determines filtration media type
- pH, affects corrosion in your plumbing
- Iron, even city water can have iron from aging distribution pipes
- TDS (Total Dissolved Solids), overall mineral content indicator
- Hydrogen sulfide, if odor is present
Treatment Recommendations by Area
Kissimmee / Osceola County (Toho Water): Many homes benefit from a water softener sized to the hardness measured at the tap, plus whole-house carbon filtration for chlorine taste and odor. Toho adds chlorine as its disinfectant in most of its systems. Add an under-sink reverse osmosis for drinking water if you want to remove the remaining dissolved contaminants.
Orlando (OUC): OUC reports an average hardness of about 7 GPG, so many homes still choose a softener for appliance protection. Standard carbon removes the free chlorine OUC uses. An RO system addresses PFAS and disinfection byproducts at the drinking water tap.
Well water homes (rural Osceola, Orange, Polk): Completely different treatment profile, see our well water guide for details.
Get Your Free Water Test
Pure Agua Enterprise provides free in-home water testing across Kissimmee, Orlando, and all of Central Florida. We test your actual tap water, not a sample from the treatment plant, and explain exactly what treatment makes sense for your home. Family-owned since 2016, 5.0★ rating with 200+ Google reviews, a WQA member installing systems that meet NSF/ANSI 58 and 61, licensed and insured.
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