Where the minerals start
The county describes the Biscayne Aquifer as mostly limestone and sand, 50 to 200 feet down. Water that sits in limestone dissolves calcium. The county's softening step removes most of it, but whatever is left, plus sodium (35 ppm in the 2025 report) and other dissolved minerals, can still leave marks when water evaporates on glass or chrome.
Is it hardness or something else?
- Chalky white crust on aerators and shower heads: likely hardness.
- Cloudy film on glass that wipes off with vinegar: minerals, often hardness.
- Spots on a dark car or windows near sprinklers: irrigation water, possibly from a well.
- Orange or brown marks: iron, a different problem. See orange stains.
Cheapest fixes first
- Squeegee shower glass after each use.
- Soak aerators and shower heads in vinegar.
- Rinse-aid in the dishwasher.
- RO water for coffee makers, kettles and glassware.
- Softener only if your test shows meaningful hardness.
Softener or conditioner
A softener removes hardness minerals through ion exchange. A salt-free conditioner changes how scale forms but leaves the minerals, so spots on glass usually remain. For a laundromat or restaurant in Lauderdale Lakes with heavy equipment, a sized softening plant is the standard answer. See water softeners in Lauderdale Lakes and salt-free vs. ion-exchange.
Tankless heaters and appliances
Heat speeds up scale, so tankless water heaters, kettles and coffee machines show it first. Manufacturers often publish a hardness level above which they recommend treatment or regular descaling. A test result lets you compare your water to that number instead of guessing.
Wells and irrigation spots
A private or irrigation well skips the county plant completely, so its water can be much harder than your tap. If spots appear on windows, cars or screens where sprinklers reach, test the irrigation water separately. See well water in Lauderdale Lakes.
Measure it
Jorge tests hardness and TDS at your tap free. Call, text or WhatsApp (305) 793-5974.
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist