Florida Water Quality Guide
Understanding Florida's unique water systems, from the vast Floridan Aquifer to coastal challenges with algae blooms and saltwater intrusion.
Environmental Health Research
Expert Reviewed
This content has been reviewed by Dr. Sarah Chen, PhD, Environmental Science Advisor, to ensure accuracy and alignment with current environmental science standards.
Last reviewed: April 2026
Florida Water System Overview
Florida's water supply is uniquely dependent on groundwater, with approximately 90% of the state's drinking water coming from underground aquifers. The Sunshine State's flat terrain, porous limestone geology, and high water table create a water system unlike any other in the nation.
The Floridan Aquifer System
- One of the world's most productive aquifers: Underlies all of Florida and parts of Alabama, Georgia, and South Carolina
- Natural filtration: Water filters through limestone over decades, emerging mineral-rich but naturally purified
- Two main zones: Upper Floridan (primary drinking water source) and Lower Floridan (deeper, more saline)
- Springs: Florida has over 700 natural springs, the highest concentration of freshwater springs on Earth
- Recharge areas: Central Florida's sandy highlands allow rainfall to replenish the aquifer
Surface Water Sources
While groundwater dominates, some Florida communities rely on surface water. Tampa Bay Water operates the region's largest desalination plant and draws from multiple reservoirs. South Florida's urban areas increasingly depend on treated surface water from canals and the Everglades system.
Red Tide and Algae Blooms
Florida faces unique water quality challenges from harmful algal blooms (HABs), including the infamous red tide caused by Karenia brevis. While these primarily affect coastal and recreational waters, they can indirectly impact drinking water sources.
Understanding Harmful Algal Blooms:
- Red tide (Karenia brevis): Naturally occurring marine algae that produces brevetoxins; affects Gulf Coast waters
- Blue-green algae (cyanobacteria): Freshwater blooms in lakes and canals that can produce microcystins and other toxins
- Lake Okeechobee releases: Nutrient-rich water discharges can trigger blooms in the St. Lucie and Caloosahatchee estuaries
Impact on Drinking Water
Most Florida drinking water comes from deep groundwater sources not directly affected by surface algae blooms. However, communities relying on surface water must monitor for cyanotoxins. The EPA has established health advisories for microcystins and cylindrospermopsin in drinking water.
Nutrient Pollution Connection
Agricultural runoff, septic tank leachate, and urban stormwater contribute nutrients that fuel algae growth. Florida's shallow water table means contaminants can quickly reach groundwater. The state has implemented Basin Management Action Plans (BMAPs) to reduce nutrient loading in impaired waters.
Common Water Quality Concerns
Florida's geology and development patterns create several distinctive water quality challenges that residents should understand.
Hard Water and Minerals
Florida has some of the hardest water in the nation due to dissolved limestone (calcium carbonate). While not a health hazard, hard water causes scale buildup in pipes and appliances, reduces soap effectiveness, and can affect taste. Many Floridians use water softeners to address this issue.
Sulfur (Hydrogen Sulfide)
The "Rotten Egg" Smell:
Many Floridians notice a sulfur smell in their tap water, especially when first running the tap. This comes from naturally occurring hydrogen sulfide in groundwater. While unpleasant, it's typically not harmful at levels found in Florida drinking water. Aeration or activated carbon filtration can reduce the odor.
Saltwater Intrusion
Coastal Florida faces increasing saltwater intrusion into freshwater aquifers due to sea level rise and over-pumping. Southeast Florida is particularly vulnerable. Elevated chloride levels can affect taste and corrode plumbing. Utilities monitor wellfields and have relocated wells inland in affected areas.
Radium and Radioactivity
Florida's phosphate-rich geology results in naturally elevated radium levels in some groundwater sources. Radium-226 and radium-228 are regulated contaminants linked to bone cancer. Central Florida communities near phosphate mining areas should review their water quality reports for radionuclide data.
Arsenic
Arsenic occurs naturally in Florida groundwater and can be elevated in certain regions. Long-term exposure increases cancer risk. The EPA MCL is 10 ppb, and Florida water systems must monitor and treat if levels exceed this standard.
PFAS Contamination
PFAS (per- and polyfluoroalkyl substances) have been detected near military installations, airports, and industrial sites across Florida. Areas near Naval Air Station Jacksonville, Patrick Space Force Base, and numerous fire training facilities have documented PFAS contamination.
Regional Water Quality Profiles
South Florida (Miami-Dade, Broward, Palm Beach)
South Florida draws from the Biscayne Aquifer, one of the most permeable aquifers in the world. This makes the water supply vulnerable to surface contamination and saltwater intrusion. Miami-Dade Water and Sewer treats water with advanced processes to meet standards despite these challenges.
View Miami water quality details
Tampa Bay Area
Tampa Bay Water serves the region with a diverse portfolio including surface water from reservoirs, groundwater from multiple wellfields, and desalinated seawater. The Tampa Bay Seawater Desalination Plant can produce up to 25 million gallons daily, providing drought-resistant supply.
View Tampa water quality details
Central Florida (Orlando Area)
Orlando Utilities Commission draws exclusively from the Floridan Aquifer through over 100 wells. The groundwater is naturally high quality, though treatment for hardness and disinfection is required. Rapid population growth puts pressure on sustainable water management.
View Orlando water quality details
Jacksonville
JEA provides water to over one million customers from the Floridan Aquifer. The utility operates multiple water treatment plants and has invested in alternative water supply projects to ensure long-term sustainability.
Resources for Florida Residents
State and Federal Resources:
Testing Your Water
Florida residents on public water systems receive annual Consumer Confidence Reports from their utility. Well owners should test annually for bacteria, nitrates, and any contaminants of local concern. The Florida Department of Health certifies laboratories for drinking water testing.
Filtration Recommendations
Based on common Florida water quality issues, residents may consider:
- For hard water: Water softeners or salt-free conditioners
- For sulfur smell: Activated carbon filters or aeration systems
- For radium/radioactivity: Reverse osmosis or ion exchange systems
- For taste improvement: Basic carbon filtration (NSF 42 certified)
- For comprehensive protection: Whole-house or point-of-use reverse osmosis
Private Well Owners:
Florida has over 2.5 million private wells that are not regulated by the state. Well owners are responsible for testing and treating their own water. The Florida Department of Health provides guidance for well construction, testing, and maintenance.