Collier County, Florida: drinking water report. Collier County spans Florida's southwestern coast, encompassing Naples, Marco Island, Immokalee, and the…
Collier County spans Florida's southwestern coast, encompassing Naples, Marco Island, Immokalee, and the eastern Everglades. Most residents receive water from the Collier County Water-Sewer District or the City of Naples utilities, which draw heavily from the Lower Tamiami Aquifer and surface water treatment from local canals and reservoirs. This coastal position, combined with agricultural runoff from inland areas and saltwater intrusion pressures, creates distinct water quality challenges for the county's 380,000 residents.
Florida's aquifer systems face documented contamination from agricultural chemicals, aging infrastructure, and naturally occurring minerals. Collier County utilities have reported detections of disinfection byproducts (trihalomethanes and haloacetic acids) in treated water, a common pattern when surface water or groundwater with organic material undergoes chlorination. While these typically remain below EPA maximum contaminant levels, chronic exposure to even low levels warrants attention for vulnerable populations.
Lead and copper testing under the EPA's revised rule shows periodic exceedances in older Naples neighborhoods and buildings constructed before 1986 plumbing code changes. The county's distribution system itself uses modern materials, but service lines and household plumbing in older structures remain risk factors. Sampling at taps in schools and older apartment complexes occasionally reveals elevated lead levels, particularly after water sits stagnant in pipes overnight or during vacations.
PFAS contamination represents an emerging concern across Florida. The EPA's UCMR5 testing (2023-2025) includes Florida utilities in nationwide monitoring for per- and polyfluoroalkyl substances. Collier County's proximity to former industrial sites, fire training facilities at Naples Airport and Marco Island, and agricultural areas using biosolids increases the potential for PFAS detection. Southwest Florida utilities in similar settings have reported PFOA and PFOS findings in source water, though concentrations vary widely by well location and aquifer depth.
Saltwater intrusion affects several coastal wellfields as sea levels rise and freshwater demand increases. The county has shifted some supply inland and invested in aquifer storage and recovery systems, but residents near the coast may notice higher sodium and chloride levels during dry seasons. Agricultural drainage from inland Immokalee occasionally introduces nitrates and pesticide residues into surface water bodies that feed treatment plants.
Test your household water, especially if you live in pre-1986 construction, near the coast, or rely on private wells in rural areas east of Naples. Check your water to see current contamination data for your ZIP code, review our water filter guide for treatment options suited to PFAS and lead, and access your detailed report for full contaminant breakdowns. For statewide context on Florida's aquifer challenges and regulatory landscape, visit our Florida water quality page.