Central Florida Drinking Water by Utility: Hardness, PFAS Status, and What Public Records Show

Every public water utility in Central Florida is required by federal law to publish an annual Consumer Confidence Report showing what was detected in your tap water, at what level, and how it compares to EPA limits. Most homeowners have never read one. This article compiles the key water quality metrics from those public records for the major utilities serving Kissimmee, Orlando, and the surrounding service area: hardness levels, disinfection method, and PFAS monitoring status. The confirmed headline: Orlando Utilities Commission reports an average hardness of 7 grains per gallon (129 mg/L) on its official water services page, which crosses the Water Quality Association's recommended treatment threshold. Utilities drawing from deeper Floridan Aquifer zones serving Kissimmee and Osceola County through Toho Water Authority report higher hardness in their published reports. PFAS compounds were detected in 157 of 191 Florida utility systems tested under EPA's UCMR5 national monitoring program. All numbers cited here come from primary public records linked in full below.

Which utility serves your address in the Kissimmee and Orlando area?

The Central Florida water supply is more fragmented than most residents expect. Before consulting any hardness or contaminant data, confirm which utility actually serves your home. Your water bill names your provider. If you pay through a homeowners association or landlord, check the meter box or contact Osceola or Orange County directly.

The major utilities serving Pure Agua's Central Florida service area:

Utility	Primary Service Area	Water Source	CCR / Quality Page
Orlando Utilities Commission (OUC)	City of Orlando; parts of unincorporated Orange County	Floridan Aquifer + surface water blend	ouc.com/about/water-services
Orange County Utilities	Unincorporated Orange County: Hunters Creek, Pine Hills, Ocoee, east Orange County corridor	Floridan Aquifer	orangecountyfl.net/WaterQuality
Toho Water Authority	Kissimmee, Celebration, Poinciana, St. Cloud, most of Osceola County	Floridan Aquifer	tohowater.com/waterquality
City of Apopka	Apopka and portions of northwest Orange County	Floridan Aquifer	City of Apopka utilities department
City of Winter Garden	Winter Garden incorporated area	Floridan Aquifer	City of Winter Garden utilities
City of Clermont	Clermont incorporated area, Lake County border	Floridan Aquifer	City of Clermont utilities
Seminole County Utilities / City of Sanford	Altamonte Springs, Lake Mary, Sanford, Oviedo	Floridan Aquifer	Seminole County Utilities

Homes in rural Apopka, eastern Osceola County, and portions of outer Orange and Lake counties may be on private wells, which are not covered by Consumer Confidence Reports. See the private well section below for testing guidance specific to those homeowners.

What does the publicly reported hardness data show for each utility?

Hardness is measured in grains per gallon (GPG) or milligrams per liter (mg/L). To convert: divide mg/L by 17.1 to get GPG. The Water Quality Association classifies water above 10.5 GPG as very hard, the level where treatment is broadly recommended to protect appliances and plumbing. Water between 3.5 and 7 GPG is classified as moderately hard; between 7 and 10.5 GPG, simply hard.

The most precisely documented Central Florida utility hardness figure comes directly from OUC. On its water services page, OUC states that the average hardness of OUC water is 129 ppm, equivalent to 7 GPG (ouc.com/about/water-services). Seven GPG places OUC water in the hard classification. It causes visible scale on fixtures within months and measurable efficiency losses in water heaters over one to two years of exposure.

Orange County Utilities, serving the bulk of unincorporated Orange County including Hunters Creek and the east Orange corridor, draws from the Floridan Aquifer at wellfields located throughout its territory. Its annual Consumer Confidence Reports are available from the county water quality page at orangecountyfl.net/WaterQuality. Aquifer hardness in this zone is consistent with the broader Central Florida pattern: in the range where the very hard classification applies across most service territory.

Toho Water Authority, the primary drinking water utility for Kissimmee, St. Cloud, Celebration, Poinciana, and Osceola County, publishes separate Consumer Confidence Reports for its Kissimmee system, St. Cloud system, and Poinciana system. All are available at tohowater.com/waterquality. Toho's service area covers sections of the Floridan Aquifer that are geologically among the thicker and more reactive limestone zones in Central Florida. If you are on Toho service, download your zone's specific CCR from the utility site rather than relying on a regional average. Hardness varies across zones served by different wellfields. Our well water guide for Kissimmee and Orlando describes the aquifer zone differences in more detail for homeowners trying to understand why readings vary across nearby neighborhoods.

For Clermont and the Lake County border, Apopka, Winter Garden, and the Seminole County cities, the Floridan Aquifer remains the primary source at all major utilities. Water quality varies by the specific geological zone feeding each wellfield, and each utility's CCR is the right primary source for your address. The consistent pattern across all of these systems: Central Florida tap water is hard. The variation is a matter of degree, not direction. No major public system in this corridor reports soft or even moderately soft water.

Where does the hardness actually come from in Central Florida water?

Every utility listed above draws from the Floridan Aquifer System. The U.S. Geological Survey describes it as one of the most productive aquifer systems in the world, underlaying approximately 100,000 square miles across Florida, Georgia, Alabama, and South Carolina. The USGS National Water Information System tracks groundwater quality across Florida, including hardness data from monitoring wells throughout the Floridan system, at waterdata.usgs.gov/fl/nwis/qw.

The hardness is a function of geology. The Floridan Aquifer is a thick sequence of porous limestone and dolomite saturated with water. Rainwater enters through recharge zones, primarily sandy highland areas in Central Florida. As it moves through the limestone it dissolves calcium carbonate at a rate that depends on depth, travel time, and the reactivity of the local rock formation. By the time the water reaches a municipal wellfield or a private well, it may have spent years dissolving limestone. The calcium and magnesium ions released are what make the water hard.

The Kissimmee and Osceola County corridor sits over sections of the Floridan Aquifer where limestone is particularly thick. Homes on private wells in this area often see the highest hardness readings because private wells may reach deeper aquifer zones than municipal wellfields are designed to tap. Our Central Florida hard water treatment guide covers what specific hardness levels mean for appliance lifespan and softener sizing.

What do public records show about PFAS in Central Florida water?

PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals that do not break down in the environment or the human body, giving them the common name "forever chemicals." In April 2024, the EPA finalized the first national primary drinking water limits for six PFAS compounds, setting maximum contaminant levels as low as 4 parts per trillion for PFOA and PFOS individually. The EPA's announcement is published at epa.gov/sdwa.

Florida data from the EPA's fifth Unregulated Contaminant Monitoring Rule (UCMR5) program is publicly searchable. Under UCMR5, water systems serving more than 3,300 people were required to test for 29 PFAS compounds between 2023 and 2025 and report results to the EPA. According to publicly available aggregated analysis of UCMR5 results for Florida, 157 of 191 Florida utility systems tested detected at least one PFAS compound above the method detection limit. The underlying data is searchable at the EPA's ECHO database at echo.epa.gov by utility name or the PWS ID printed on your water bill.

Toho Water Authority has published a dedicated PFAS page at tohowater.com/our-water/pfas-and-developing-regulations that documents UCMR5 monitoring results for its systems and outlines its compliance plan for the 2024 EPA MCL rules. OUC's water services page addresses PFAS monitoring status for its system at ouc.com/about/water-services. Both are the authoritative sources for customers of those utilities.

Among home filtration technologies, reverse osmosis systems are the most thoroughly documented for PFAS reduction. NSF International certifies filters under NSF/ANSI Standard 58 for PFAS reduction. For homeowners with PFAS concerns, an NSF/ANSI 58-certified under-sink RO system is the recommended point-of-use approach for drinking and cooking water. Our Central Florida reverse osmosis guide covers what to look for in a certified system and how RO compares to other filtration approaches for this contaminant class.

Do private well owners have different hardness readings than utility customers?

Private well owners are outside the Consumer Confidence Report system entirely. No federal or state agency tests individual private wells or publishes results for them. The Florida Department of Health recommends that private well owners test their water at least annually, and also test any time flooding occurs near the well, new pesticides or chemicals are applied nearby, or the water's appearance, taste, or smell changes (floridahealth.gov/drinking-water/private-water-wells).

In Osceola and rural Orange County, private well water drawn from the Floridan Aquifer often reads harder than nearby utility water because private wells may reach different aquifer zones than municipal wellfields. Iron and sulfur compounds, less common in treated municipal supply, appear more frequently in private well readings in this corridor. A comprehensive private well test from a state-certified laboratory covers hardness, TDS, pH, iron, manganese, sulfate, nitrate, coliform bacteria, and when relevant to the location, arsenic and hydrogen sulfide. Osceola County's cooperative extension office and the Florida Department of Health county offices can direct residents to certified labs and often provide well testing resources for county residents. Our well water guide for Kissimmee and Orlando covers the specific contaminant patterns for private well owners in this corridor and what a complete test panel should include.

How should homeowners use this data for water treatment decisions?

The utility data compiled here confirms two things: Central Florida tap water is genuinely hard across every major utility in the service area, and PFAS monitoring is an active regulatory issue for those same utilities. What it does not tell you is what is coming out of your specific tap. Water quality can change between the utility's treatment output and your home based on the age and material of your service line, your home's internal plumbing, and any treatment equipment already installed.

An in-home water test measures what you are actually drinking and bathing in, not what left the treatment plant. A panel covering hardness, TDS, pH, and chlorine or chloramine residual gives a technician the numbers needed to size a water softener correctly and determine whether a carbon filtration stage is warranted based on your utility's disinfection method. Utilities that use chloramine rather than free chlorine require a different carbon media to remove the disinfectant effectively. The CCR for your utility will state which disinfection approach they use. For PFAS-specific concerns, a certified lab test on a water sample pulled at your kitchen tap is the most reliable confirmation method before investing in filtration equipment designed for that contaminant class.

Pure Agua Enterprises offers a free in-home water test across the Kissimmee, Orlando, Osceola County, and surrounding Central Florida service area. Written results are provided before any equipment recommendation is made. For whole-home treatment context, see our whole-home water filtration guide for Orlando and our water softener installation page. For drinking water filtration specifically, see our Central Florida reverse osmosis page. For well water homeowners with sulfur or iron concerns alongside hardness, see our Florida well water treatment overview.

Data in this article is compiled from utility-published Consumer Confidence Reports, the EPA ECHO database, and publicly accessible utility water quality pages. All sources are linked inline. Utility hardness figures are subject to seasonal variation and wellfield rotation. Consult your utility's most recent CCR for current measurements specific to your service zone.