PFAS in Central Florida Private Wells: What EPA and USGS Data Show in 2026

The U.S. Environmental Protection Agency published enforceable Maximum Contaminant Levels (MCLs) for six per- and polyfluoroalkyl substances (PFAS) in April 2024, setting the standard for PFOA and PFOS at 4 parts per trillion each. A 2023 U.S. Geological Survey study of private wells across the United States found PFAS compounds at or above health advisory levels in an estimated 45 percent of tested samples. Private wells in Florida are not regulated under the federal Safe Drinking Water Act, meaning the EPA MCL rule does not require testing or treatment for households on private wells. Well owners in Central Florida must test on their own initiative. Treatment systems that hold NSF/ANSI Standard 58 (reverse osmosis) or Standard 53 (activated carbon) certification are the validated options for PFAS reduction at the point of use.

What are PFAS and why do they matter for well water?

Per- and polyfluoroalkyl substances are a family of more than 12,000 synthetic chemicals used since the 1940s in nonstick cookware coatings, food packaging, firefighting foams (aqueous film-forming foam, or AFFF), stain-resistant fabrics, and industrial processes. The carbon-fluorine bond at the core of PFAS chemistry is among the strongest in organic chemistry, which is why these compounds degrade slowly in the environment and have accumulated in groundwater, surface water, and biological tissues worldwide. The informal label "forever chemicals" refers to this persistence.

The EPA's 2024 PFAS drinking water rule, formally the National Primary Drinking Water Regulation for PFAS, established enforceable MCLs for six specific compounds: PFOA and PFOS at 4 ppt each individually, PFHxS, PFNA, and HFPO-DA (GenX) at 10 ppt each, and a hazard index limit for any mixture of PFHxS, PFNA, HFPO-DA, and PFBS (EPA PFAS drinking water regulation). Public water systems have until 2029 to comply. Private wells are outside the rule's scope.

Health effects associated with PFAS exposure vary by compound and level. The EPA's health advisory documentation links elevated PFOA and PFOS exposure to increased cholesterol levels, reduced vaccine response in children, thyroid hormone disruption, and increased risk of certain cancers, based on studies cited in the 2024 rulemaking record (EPA PFAS health effects summary). The science is evolving; the 4 ppt MCL for PFOA and PFOS reflects EPA's assessment that there is no level of exposure that is entirely without risk for those two compounds.

What did the USGS find about PFAS in private wells?

In 2023, the U.S. Geological Survey published the first nationally representative study of PFAS in private wells, drawing on samples collected from 716 domestic wells across the United States between 2016 and 2021. The study found at least one PFAS compound in approximately 45 percent of tested wells at concentrations at or above the EPA health reference level at the time of sampling (USGS national news release on private well PFAS study).

The full study is published in the journal Science of the Total Environment. Key findings relevant to Central Florida well owners:

The USGS PFAS in groundwater data is accessible through the National Water Information System at waterdata.usgs.gov. PFAS monitoring data for Florida sampling locations can be filtered using parameter codes associated with individual PFAS compounds.

What are the documented PFAS sources in Central Florida?

The EPA maintains a publicly searchable PFAS site information database at epa.gov/pfas/pfas-analytic-tools that maps sites across the United States where PFAS use, release, or remediation has been documented. In Central Florida, documented sources in public records include:

Military and government aviation sites using AFFF: Multiple military installations and civilian airports in and around Central Florida have documented historical use of aqueous film-forming foam for fire suppression training and emergency response. AFFF formulations used before the mid-2000s contained PFOS and PFOA as primary active ingredients. The Florida Department of Environmental Protection's PFAS program (floridadep.gov PFAS page) tracks investigation and remediation status at documented AFFF sites statewide.

Industrial wastewater and land application: Florida's warm climate supports widespread application of treated wastewater and biosolids to agricultural and residential land. PFAS compounds bind to biosolid particles and can enter groundwater through this pathway. The EPA's EJScreen tool and FDEP data identify land application sites in several Central Florida counties.

Fluorochemical manufacturing and fire training areas: The Pinecastle Jeep Range area in Orange County and other historical military use areas in Central Florida appear in FDEP and EPA site registries. FDEP groundwater monitoring at these sites is documented in public records available through the Florida DEP document management portal.

Proximity to a documented PFAS site does not guarantee contamination of a specific private well; groundwater plume direction, well depth, aquifer type, and local hydrogeology all affect whether PFAS at a site reaches a given well. However, proximity is the primary risk factor identified in both the USGS study and EPA's site-screening guidance.

How do I find out whether my Central Florida well has PFAS?

The only way to know whether your well water contains PFAS compounds is to test it. Unlike coliform or hardness testing, which can be done with field kits, PFAS testing requires laboratory analysis. The relevant analytical method is EPA Method 533 or EPA Method 537.1, both of which detect PFAS at low parts-per-trillion concentrations.

Certified laboratories that run PFAS analysis on drinking water samples are listed by state through the EPA's Environmental Laboratory Certification Program. For Florida, the Florida Department of Health Environmental Laboratory Certification Program maintains a directory of labs certified for PFAS analysis (Florida DOH lab certification directory). Sample collection procedures matter for PFAS testing because PFAS can leach from certain plastic containers; the lab provides collection materials and specific instructions.

Florida's private well testing guidance under Chapter 62-532 of the Florida Administrative Code requires well owners to arrange and pay for water quality testing; there is no mandatory PFAS testing schedule for private wells under state law. Voluntary testing is the homeowner's responsibility. The Florida Department of Health's Bureau of Environmental Health publishes guidance on what private well owners should test for and how often at floridahealth.gov/environmental-health/drinking-water/private-wells.

What treatment systems remove PFAS from well water?

Two treatment technologies have validated PFAS removal performance at the point of entry or point of use: reverse osmosis (RO) systems and granular activated carbon (GAC) or activated carbon block (ACB) filters. Both are validated against EPA Method 533 or 537.1 when certified under NSF International standards.

Reverse osmosis: RO membranes reject PFAS compounds by size exclusion and charge effects. Systems certified under NSF/ANSI Standard 58 for PFOA and PFOS reduction are the validated standard for residential drinking water treatment. The NSF/ANSI 58 certification program tests product performance against specific contaminant challenge waters; a certified system has demonstrated reduction to below the standard's limits under controlled conditions. The NSF product certification database at nsf.org allows consumers to verify certification status for specific products.

RO systems require membrane replacement on the manufacturer's schedule, typically every 2 to 3 years under residential conditions. In Central Florida's hard water environment, a whole-house softener upstream of a point-of-use RO system protects membrane life by reducing the hardness load on the membrane. Our article on RO membrane lifespan in the Floridan Aquifer context covers how local water chemistry affects membrane replacement intervals.

Activated carbon filtration: Granular activated carbon and activated carbon block filters adsorb PFAS compounds onto the carbon surface. Systems certified under NSF/ANSI Standard 53 for PFOA and PFOS reduction have demonstrated performance under test conditions. GAC filter effectiveness depends on contact time, carbon bed volume, and PFAS compound type. Long-chain PFAS like PFOA and PFOS adsorb more readily than short-chain compounds. Filter exhaustion (the point at which PFAS breaks through the carbon bed) is not visually detectable; replacement on schedule is essential.

Ion exchange (anion exchange resin): Single-use anion exchange resins specifically designed for PFAS adsorption are a newer technology with strong documented performance in municipal systems. Residential versions are becoming available and are listed in the NSF/ANSI 61 certification pathway. This technology is less established in the residential market than RO or GAC but is being evaluated as part of several Florida municipal PFAS remediation programs.

Point-of-entry whole-house systems for PFAS are feasible but require larger carbon or RO equipment and higher capital cost than point-of-use systems. For most residential applications where the concern is drinking and cooking water, a certified under-sink RO system at the kitchen faucet is the most cost-effective validated approach. Consult our whole-house filtration vs. RO guide for a comparison of treatment scope and sizing for different household goals.

Does the Floridan Aquifer protect well water from PFAS?

The Floridan Aquifer's confining layers provide some protection from shallow contamination, but that protection is not absolute. The karst geology of Central Florida means the confining Hawthorn Group has fractures, sinkholes, and breaches through which surface water and shallow groundwater can enter the Upper Floridan directly. The USGS's Florida karst studies, particularly those by the Florida Water Science Center at usgs.gov, document preferential flow paths where karst features short-circuit the confining layer.

PFAS plumes from AFFF release sites in Florida have been detected in the Floridan Aquifer at documented remediation sites. FDEP site reports for some Central Florida locations show Floridan Aquifer PFAS detections below the source area, particularly where the confining layer is thin or interrupted by solutionally enlarged fractures in the limestone. The depth of a residential well, and whether it penetrates or stays above the Upper Floridan, affects the exposure pathway, but depth alone does not guarantee PFAS-free water in a karst environment.

What should Central Florida well owners do now?

The actionable steps based on current EPA and USGS guidance:

Step 1: Screen for proximity risk. Check the EPA PFAS Analytic Tools site mapper (epa.gov/pfas/pfas-analytic-tools) for documented PFAS sites within several miles of your property. Also review the FDEP PFAS database (floridadep.gov PFAS page) for any investigation areas in your county.

Step 2: Test your well. Use a Florida DOH-certified laboratory running EPA Method 533 or 537.1 for a comprehensive PFAS panel. Costs for residential PFAS panels currently range from $150 to $400 depending on the number of compounds included in the panel; verify current pricing with the lab directly.

Step 3: If results are above EPA MCLs, install certified treatment. PFOA or PFOS above 4 ppt, or other listed PFAS at their respective MCLs, warrants an NSF/ANSI 58-certified RO system or NSF/ANSI 53-certified carbon system at minimum for the drinking water supply. Retest after installation to confirm treatment effectiveness.

Step 4: Retest periodically. PFAS sources can migrate in groundwater plumes over time. A negative test in 2025 does not guarantee the same result in 2030. USGS and FDEP guidance on private well PFAS monitoring does not specify a mandatory retesting interval for private wells, but retesting every 3 to 5 years, or after any known PFAS release in the area, is a reasonable practice consistent with general private well maintenance recommendations from the CDC private well guidance.

If you are on a private well in Central Florida's Lake, Marion, Orange, Alachua, Osceola, Citrus, or Sumter County and want to understand your PFAS risk, Quality Filters and Pumps can help identify certified testing labs and discuss NSF-certified treatment options matched to your well's chemistry. We do not sell specific products by brand but help homeowners evaluate certified system options for their situation. Contact us for a free consultation.