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:

High Hardness: Osceola County water consistently tests among Central Florida's hardest, with finished water hardness typically reported at 12–22 grains per gallon (GPG). 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.

Chloramination: Toho Water Authority switched from chlorine to chloramines (a combination of chlorine and ammonia) as the primary disinfectant. Chloramines are more stable in distribution pipes and produce lower levels of trihalomethane byproducts than chlorine, but they're harder to remove from finished water. Carbon filtration that would neutralize chlorine in minutes takes much longer with chloramines; catalytic carbon is required for effective chloramine removal.

Orlando / Orange County Water

Orlando Utilities Commission (OUC) and Orange County Utilities both serve different parts of the Orlando metropolitan area. Orange County has made significant investments in alternative water sources, blending groundwater with reclaimed and surface water sources:

Southern Water Treatment Plant: Uses reverse osmosis to treat deep aquifer water before blending with surficial aquifer and surface water. The resulting blended water has lower hardness than pure Floridan Aquifer water, typically 8–14 GPG in much of Orange County, but more complex chemistry from blending multiple source waters.

PFAS Monitoring: Orange County Utilities has been proactive in PFAS testing, reporting consistently below the EPA's 2022 health advisory limits. However, the EPA's 2024 national primary drinking water regulations set new MCLs for PFOA and PFOS at 4 parts per trillion, the strictest limits ever established, and continued monitoring is warranted.

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:

Naturally Soft Pockets: Interestingly, some Seminole County areas test at lower hardness (6–10 GPG) than their Orange and Osceola County counterparts due to geological variations in the aquifer. However, most of the county still exceeds the 7 GPG threshold where water quality benefits from softening.

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. Even the "softer" parts of the metro at 6–8 GPG still benefit from conditioning. At 15–22 GPG (common in Kissimmee and south Orlando), water softening becomes essential for appliance protection.

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.