Why South Florida Water Is Hard, and What That Costs You

People move to Miami and notice their soap stops working. That is not the plumbing and it is not the utility making a mistake. It is geology.

The water comes out of limestone. Miami-Dade and Broward both draw from the Biscayne Aquifer, a shallow aquifer sitting in porous limestone. Water moving through limestone dissolves calcium out of it. By the time it reaches a treatment plant it is already a hard, calcium-heavy water, and while utilities treat it, it still arrives at the house hard.

Hardness is not a health problem. It is a cost problem. Calcium comes out of solution as scale wherever water is heated or sits still: inside the water heater, inside the dishwasher, inside the coffee maker, on the shower head. A scaled water heater has to work harder to heat the same water, and it fails earlier than it should. None of that shows up as a bill labelled "hard water", which is exactly why it goes unnoticed for years.

The chlorine taste is a separate thing. South Florida utilities disinfect with chloramine, and Miami-Dade runs a short changeover to free chlorine once a year as routine maintenance, announcing in advance that residents will taste and smell it. That is normal and it is temporary. Carbon filtration removes it whichever disinfectant is running.

What actually fixes it. Softening addresses the hardness, carbon addresses the taste and smell, and reverse osmosis at the sink addresses what you drink and cook with. Which of the three you need depends on your house and your water, and the only way to know is to test it. That is where we start when we come out.