Miami Water Quality Guide: Saltwater Intrusion Concerns
Comprehensive guide to Miami water quality, Biscayne Aquifer sourcing, saltwater intrusion challenges, and safety information.
Environmental Health Research
Health Information Reviewed
Health-related content reviewed by Michael Rodriguez, MSc, Public Health Consultant, to ensure public health recommendations are accurate and appropriate.
Last reviewed: April 2026
Water Source
Miami-Dade County draws its entire drinking water supply from the Biscayne Aquifer, a highly productive limestone aquifer underlying most of South Florida. This shallow aquifer is recharged by rainfall and the Everglades system, providing high-quality groundwater that requires less treatment than surface water sources. Miami-Dade Water and Sewer Department (WASD) operates three regional water treatment plants and numerous wellfields to serve nearly 2.4 million customers. The aquifer's porous limestone structure allows for rapid recharge but also makes it vulnerable to contamination and saltwater intrusion.
Water Treatment Process
Miami-Dade's three main treatment plants (Alexander Orr Jr., Hialeah-Preston, and South Dade) use lime softening as the primary treatment to reduce the naturally occurring hardness in Florida groundwater. The process includes aeration, lime addition, sedimentation, filtration, and disinfection with chloramines. Fluoride is added for dental health. The lime softening process also helps remove some naturally occurring radionuclides. Treated water meets all federal and state drinking water standards before entering the distribution system.
Known Issues and Saltwater Intrusion
Miami faces unique challenges protecting its groundwater supply from saltwater intrusion and managing water quality in a subtropical environment.
- Saltwater intrusion threatens coastal wellfields as sea levels rise
- Some wells have been abandoned due to saltwater contamination
- Hard water (high mineral content) is common even after softening
- Naturally occurring radium present in some groundwater
- Potential contamination from septic systems in older areas
- Hurricane storm surge can affect coastal wellfields
- Climate change accelerating sea level rise and intrusion
- Agriculture and development pressure watershed areas
Recent Improvements and Resilience Measures
Miami-Dade has invested significantly in protecting water supplies and adapting to climate change challenges.
- Relocated wellfields away from saltwater intrusion zones
- Built saltwater barrier systems to protect aquifer
- Invested in alternative water supply projects
- Upgraded treatment facilities with modern technology
- Expanded water conservation and reuse programs
- Enhanced monitoring for saltwater intrusion
- Developed climate adaptation and sea level rise plans
- Implemented emergency interconnections with other utilities
EPA Compliance and Monitoring
Miami-Dade water meets all EPA drinking water standards, though the county must actively monitor for naturally occurring contaminants and saltwater intrusion. Annual water quality reports show compliance with primary drinking water regulations. The county conducts extensive wellfield monitoring to detect saltwater intrusion early. Miami-Dade participates in EPA programs monitoring for emerging contaminants including PFAS. Radium levels are monitored and managed through treatment processes.
Note: For the most current water quality data, view the Miami Water Quality Report which includes EPA SDWIS data and contaminant analysis.
Recommendations for Miami Residents
Miami tap water is safe to drink, though some residents may prefer additional treatment for taste or mineral content.
- 1Reverse osmosis can reduce hardness and improve taste
- 2Carbon filtration removes chloramine taste and odor
- 3Water softeners help with remaining hardness
- 4Stay informed about saltwater intrusion through county reports
- 5Review annual Water Quality Reports from WASD
- 6Maintain hurricane emergency water supplies
- 7Report any unusual taste, odor, or appearance
- 8Consider whole-house filtration for comprehensive treatment
Water Filter Options for Miami
Based on Miami's water quality profile, consider these filtration options:
Activated Carbon Filters
Good for improving taste, removing chlorine/chloramine, and filtering common organic compounds.
Reverse Osmosis Systems
Comprehensive filtration removing 95-99% of contaminants including lead, PFAS, and dissolved solids.
Related Resources
- Miami, Florida Water Quality Report
View current contaminant data and quality scores
- Florida State Water Quality Overview
Compare water quality across Florida cities
- Home Water Testing Guide
How to test your water at home
- Complete Guide to Lead in Drinking Water
Understanding lead risks and mitigation
- How to Choose the Right Water Filter
Filter recommendations by contaminant type
- Water Filter Cost Calculator
Calculate the cost of different filtration options