Local Water Quality
Fort Myers, FL Well Water Treatment: Lee County Private Wells, Iron, H2S, and PFAS Considerations
Most Fort Myers residents receive water from Lee County Utilities (LCU) — treated, disinfected, and delivered through a distribution system that serves the growing city. But a significant portion of Lee County's population, particularly in the more rural eastern and southern portions, relies on private wells. And even for those on LCU service, understanding what's in the water — and where it comes from — is essential to making informed decisions about home filtration.
**Lee County's Water Supply: What LCU Customers Receive**
Lee County Utilities uses a regional supply chain that includes river intake from the Caloosahatchee River, treated through advanced processes including reverse osmosis membranes. The treated water for most Fort Myers service areas averages 8–14 GPG in hardness — harder than some Florida cities, but softer than aquifer-direct systems in Polk County or the Tampa metro area.
LCU disinfects with chloramines, which is effective for maintaining a safe residual through long distribution lines in Lee County's sprawling geography. Chloramines are harder to remove than free chlorine, require catalytic carbon for effective filtration, and can degrade rubber components in older plumbing over time.
**The Well Water Reality in Southeast Lee County**
Private wells in the Fort Myers area access the Floridan Aquifer System, typically at depths of 200 to 800+ feet. What comes up from these wells reflects the geochemistry of ancient limestone: high hardness, often hydrogen sulfide, and naturally occurring radionuclides.
Hydrogen Sulfide (H2S) — The Rotten Egg Problem
H2S is one of the most common complaints from Lee County private well owners. Formed in anaerobic (oxygen-depleted) groundwater conditions where sulfate-reducing bacteria metabolize sulfur compounds, H2S produces the characteristic rotten egg or sulfur smell even at very low concentrations (0.5 mg/L is detectable; levels of 1–5 mg/L are common in Floridan Aquifer wells in this region).
H2S is not just an odor problem. At elevated concentrations it's corrosive to copper plumbing, brass fixtures, and appliances. It also degrades water heater anodes faster than normal, shortening appliance lifespan.
Iron and Manganese — The Staining Problem
Iron above 0.3 mg/L causes the orange-brown staining that's common on toilets, sinks, laundry, and concrete from Lee County well owners. There are two forms of iron in groundwater:
Ferrous iron (dissolved, clear water iron) — invisible in the well but stains surfaces after exposure to air and oxidation. Ferric iron (particulate, red water iron) — visibly discolored water, settles out as sediment.
Many Lee County wells contain primarily ferrous iron, which makes it invisible until it oxidizes — a common source of confusion for homeowners who see clear water from the tap but orange staining on fixtures.
Manganese, while less common, produces black-gray staining that's often mistaken for mold. At levels above 0.05 mg/L (the EPA secondary standard), manganese staining becomes problematic.
Hardness — Scale on Everything
Deep Floridan wells in Lee County typically produce water at 14–22 GPG hardness — very hard by any measure. This creates scale on fixtures, inside appliances, and on glass surfaces.
PFAS — The Legacy Contamination Concern
Page Field — the Fort Myers commercial and general aviation airport operated by Lee County Port Authority — has a documented history of AFFF (aqueous film-forming foam) use for firefighting training and emergency response. AFFF contains PFAS compounds. The groundwater contamination plume from Page Field has been studied and monitored by Florida DEP and the EPA. While LCU water treatment processes provide a degree of PFAS removal, private well owners near Page Field should test their wells for PFAS.
Under the EPA's 2024 PFAS National Primary Drinking Water Regulation, PFOA and PFOS have individual MCLs of 4 ppt — a level that requires specialized testing equipment to measure accurately. If you're on a private well within several miles of Page Field or any former military installation, a PFAS-specific water test is strongly recommended.
**Building a Well Water Treatment System for Fort Myers**
For a typical Fort Myers private well with H2S, iron, hardness, and potential PFAS concerns, a complete treatment sequence looks like this:
Stage 1: Pretreatment for H2S and Iron
If H2S is above 2 mg/L, an air injection oxidizing system (air charge tank followed by a filter) is most effective. For lower H2S (0.5–2 mg/L) combined with iron, a catalytic carbon oxidizing filter using specialty media (such as Centaur catalytic carbon or manganese dioxide-based media) can address both simultaneously. The oxidation converts H2S to insoluble sulfur particles and ferrous iron to ferric iron, which are then trapped by the filter.
Stage 2: Iron/Manganese Filter
If iron is above 1 mg/L or manganese is present, a dedicated iron filter using greensand, birm, or Filox media (manganese dioxide) provides effective removal after oxidation. This protects the downstream softener — iron-fouled softener resin is a common and costly problem.
Stage 3: Water Softener
After iron removal, a conventional ion exchange water softener addresses hardness, preventing scale throughout the home. For Lee County well water at 14–22 GPG, a 48,000-grain capacity softener is typical for a 3–4 bedroom home.
Stage 4: Catalytic Carbon Filter
A catalytic carbon whole-house filter after the softener removes residual VOCs, any remaining H2S traces, herbicide and pesticide residues from agricultural runoff (Lee County has active agriculture in the eastern areas), and improves overall taste and odor.
Stage 5: UV Disinfection
Private wells are not continuously disinfected. UV disinfection at the point of entry provides bactericidal protection against E. coli, coliform bacteria, and other pathogens. This is particularly important in areas with known agricultural runoff or flooding events.
Stage 6: Reverse Osmosis for Drinking Water
A point-of-use reverse osmosis system under the kitchen sink is the most practical solution for PFAS, radionuclides, nitrates, and overall TDS reduction for drinking and cooking water. Modern RO systems with remineralization filters add beneficial calcium and magnesium back to the water for improved taste.
**Questions to Ask Before Any System Purchase**
Before investing in water treatment equipment for a Lee County private well, get a comprehensive water test — not just a basic hardness test, but iron, manganese, H2S, pH, TDS, bacteria, nitrates, and ideally a PFAS panel if you're near known contamination sources. The answers determine which combination of treatment technologies makes sense for your specific water quality profile.
Know your well depth and which aquifer it accesses. Know your household size and peak water demand, which determines system capacity. If you have a water softener already, confirm when it was last serviced and whether the resin has been tested for iron fouling.
**The H2O Heroes in Fort Myers and Lee County**
The H2O Heroes serves the Fort Myers and greater Lee County market. We provide free water testing for well and city water users, and our technicians understand the specific aquifer conditions, PFAS concerns, and agricultural runoff patterns that affect water quality throughout Southwest Florida.
Visit our [Fort Myers page](/locations/fort-myers-fl) or call us to schedule a water test at your property. Understanding your water is the first step — and we can help with the rest.