Water Reports / FL
Miami tap water, decoded.
Source: Miami-Dade Water and Sewer Department
Disinfectant
Chloramine
Hardness
Hard
TDS
200–350 ppm
Watch items
3
What to know about Miami water
- +Biscayne aquifer water is limestone-filtered and genuinely hard, so scale is a daily reality on fixtures and hair.
- +Chloramine across the system, persistent in the long, warm distribution network.
- +PFAS has been detected in parts of the Biscayne aquifer; the county treats and blends to meet limits.
Hardness detail: ~10–14 grains per gallon.
For your shower
Miami is the strongest shower-filter case on this list. Hard limestone water plus persistent chloramine is the exact combination that dries skin, frizzes hair, and coats fixtures. Deep media contact and scale management both matter.
For your glass
Hardness is safe but tastes like it. Chloramine adds a faint chemical note. Reverse osmosis flattens both, and remineralization returns a controlled mineral balance instead of the aquifer's heavy limestone load.
How we'd filter Miami
For Miami showers, Monolith XL's deep catalytic bed handles the chloramine while the media stack polishes the limestone-heavy character. For the glass, Opus strips the aquifer variability and rebuilds a precise profile.
Why is Miami water so hard?
The Biscayne aquifer runs through limestone, which dissolves calcium and magnesium directly into the supply. At 10 to 14 grains per gallon it is among the hardest big-city water in the country.
Does Miami use chlorine or chloramine?
Chloramine, across Miami-Dade. The warm, long distribution network needs a stable disinfectant, which also means it arrives at your tap at full strength.
Is there PFAS in Miami's water?
PFAS has been detected in parts of the Biscayne aquifer. Miami-Dade treats and blends to stay within EPA limits, and point-of-use reverse osmosis is the standard way to reduce it further at home.
More reports
Figures are drawn from each utility's most recent consumer confidence report and public statements. Water chemistry varies by season and neighborhood; your utility's annual report is the authoritative source for your address.