It depends on which part of WASD's system serves your address. WASD's main system includes a softening step at more than one of its plants: according to the 2025 WASD Water Quality Report, the Alexander Orr, Jr. plant uses lime treatment to reduce hardness, and the John E. Preston plant uses enhanced softening. The South Dade system does not include a softening step. Your bill settles which utility you're on, and that matters before you read anything else on this page. For more on where to start, the Water Filter Installation in Miami-Dade County, FL page covers the county broadly.
How to get a clear picture of your water hardness
Find your utility on your bill
Some addresses inside the WASD service area actually get water from a different utility running through WASD pipes. WASD's 2025 report notes that one area near NE 163 Street to NE 181 Street receives water from the City of North Miami Beach, delivered through WASD lines. Your bill settles which utility you're on.
Pull WASD's annual water quality report
WASD's 2025 report covers the monitoring period January 1, 2025 to December 31, 2025. It describes water sources and treatment steps, but it prints no hardness figure for either system.
Note which plant serves your area
WASD pulls most of its supply from the Biscayne Aquifer. The Alexander Orr Jr. plant uses lime treatment to reduce hardness, then disinfects and filters the water, according to WASD's 2025 report. The Hialeah Reverse Osmosis Water Treatment Plant draws from the Upper Floridan Aquifer, a brackish source about 1,400 feet deep. That plant serves the City of Hialeah and the county's northwest service area.
Look at the DEP 2024 sample file for plant-level figures
Florida DEP's 2024 sample file shows calcium hardness medians at WASD main-system plant entry points of 45.3 mg/L at Hialeah, 69 mg/L at Orr, and 81.3 mg/L at Preston. Those are calcium-only figures, not total hardness, which runs higher. If you are in South Dade, the same DEP 2024 file shows total hardness medians of 232 to 263 mg/L across the five South Dade plants.
Ask WASD directly if you are unsure
The DEP figures are sampled at plant entry points, not at a home's tap. If you want to know the range for your street, contacting WASD directly is an option.
Read the report yourself
If you have not read a water quality report before, How to read your utility's annual water report walks through what the numbers mean and what to look for.
What the numbers actually mean for your home
The main-system calcium figures from Florida DEP's 2024 data come after lime treatment at plants like Orr. Calcium hardness alone does not tell the full story. Total hardness includes magnesium too, so the real total at any point is higher than the calcium number by itself. The South Dade system's total hardness medians of 232 to 263 mg/L from DEP's 2024 file are a separate situation from the main system entirely. Those two systems are not comparable. A fact about one does not carry over to the other. Whether any of this matters to you depends on what you are trying to do and where in your home you want filtered water. Choosing between a whole-house setup and a point-of-use system is its own question. Whole-house filter or reverse osmosis: how to choose covers that. If you are wondering whether a softener applies to your situation, Water softener or water filter: what's the difference? explains what each does. We are not offering softener installs yet, so that page is there for information only.
What we can do from here
We start with homes in Miami-Dade, Broward, and Palm Beach counties on city water. You call, send a few photos of where the water comes in or of your open sink cabinet, and get one written price for a named system. A local plumber does the install. If you want to talk through what makes sense for your address, the Water Filter Installation in Miami, FL page has the details, or you can go straight to contact us.
