Kissimmee and Orlando Water Quality: What's Actually in Your Tap Water

Orange County, Osceola County, and Seminole County, the tri-county heart of the Orlando metro, draw their water from a patchwork of sources and face distinct quality challenges. If you're in Kissimmee, your water travels a different path than your neighbor in Lake Mary or East Orlando. Understanding these differences is the first step toward protecting your home and family.

Kissimmee / Osceola County Water

Toho Water Authority serves most of Kissimmee and unincorporated Osceola County, drawing primarily from the Floridan Aquifer. Osceola County's groundwater is notable for several characteristics:

Hardness: Toho Water Authority, which supplies most of Osceola County, does not list a hardness figure in its 2025 water quality reports, so the reliable number for your home is one measured at your tap. The aquifer here passes through extensive limestone formations, loading the water with calcium and magnesium. Limescale buildup on fixtures, faucets, and showerheads is universal in untreated Kissimmee homes.

Hydrogen Sulfide: The distinctive "rotten egg" odor reported by many Kissimmee residents comes from hydrogen sulfide naturally present in Osceola County groundwater. While typically at aesthetic (non-health) levels, it's pervasive and affects water taste and any metal plumbing it contacts.

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 filtration removes free chlorine quickly; homes on the Harmony system need catalytic carbon to remove chloramine.

Orlando / Orange County Water

Orlando Utilities Commission (OUC) and Orange County Utilities (OCU) serve different parts of the Orlando metropolitan area. They are separate utilities, and each publishes its own water quality report:

OUC: OUC says its water comes from the Lower Floridan Aquifer and is treated with ozone and then chlorine. It states that it does not use chloramines and that the average hardness of its water is 129 ppm, about 7 GPG (ouc.com/about/water-services).

Orange County Utilities: OCU lists chlorine as the disinfectant for each of its systems and does not list a hardness figure, so a tap test is the way to get your number (OCU 2025 water quality report).

PFAS Monitoring: OCU's 2025 report says PFAS monitoring begins in 2027 (OCU 2025 report). The EPA's 2024 national primary drinking water regulations set MCLs for PFOA and PFOS at 4 parts per trillion, the strictest limits ever established for these compounds, so it is worth reading the PFAS section of your utility's latest report.

Disinfection Byproducts: Orange County's Consumer Confidence Report shows total trihalomethanes (TTHMs) at levels that, while compliant, are in the upper portion of the allowable range during summer months when warmer source water requires more aggressive disinfection treatment.

Seminole County Water

Seminole County Utilities serves Lake Mary, Sanford, Casselberry, and surrounding communities. Seminole County draws almost exclusively from the Upper Floridan Aquifer:

Hardness: Check your utility's annual water quality report for a hardness figure, or have your water tested at the tap.

Total Dissolved Solids: Seminole County water TDS typically runs 200, 350 mg/L, below the EPA secondary standard of 500 mg/L but detectable in taste and contribution to scale.

What This Means for Your Home

Regardless of which Central Florida utility serves your home, several water quality realities apply broadly:

You have hard water. OUC's stated average of 129 ppm falls in the USGS "hard" range of 121 to 180 mg/L, and the other utilities draw from the same limestone aquifer. The harder your water tests, the more a softener protects your appliances.

Chlorine or chloramines are present. Every Central Florida municipal source disinfects. Whole-house carbon filtration removes taste and odor while protecting your skin and hair from daily chlorine exposure.

Drinking water quality can be improved. Even water meeting all EPA standards contains disinfection byproducts, hardness minerals, and trace compounds that a point of use reverse osmosis system virtually eliminates.

Pure Agua provides free in-home water testing across the Orlando and Kissimmee metro. We test for hardness, chlorine/chloramines, TDS, iron, and pH, giving you specific data for your address, not county-level averages.