Hard Water in Orlando: What It Does and How to Clean It

OUC reports Orlando water at 129 parts per million of hardness, about 7 grains per gallon. Here is what that means for glass, chrome and tile, who supplies the rest of the area, and how to keep fixtures clear.

Orlando water comes up from deep in the Floridan Aquifer, and it carries dissolved minerals with it. Every drop that dries on a shower door or faucet leaves a little of those minerals behind. Over weeks, the spots join into a haze. This guide explains the local numbers, which utility supplies which part of the area, and how to clean mineral film without damaging the surfaces underneath.

Who supplies the water across the Orlando area

The Orlando Utilities Commission draws its water from the Lower Floridan Aquifer and uses an ozone treatment process to remove unpleasant tastes and odors. OUC reports an average hardness of 129 parts per million, which it also expresses as 7 grains per gallon.

Winter Park runs its own utility. Its four interconnected plants supply about 24,000 connections, and its treatment includes chlorination, ozonation and sodium hydroxide added for corrosion control of copper piping.

Lake Mary pumps from six groundwater wells in the upper Floridan Aquifer and treats with an ultraviolet light advanced oxidation process, granular activated carbon and chlorination.

Toho Water Authority, the largest water provider in Osceola County, where Kissimmee sits, draws from the Floridan Aquifer and runs 17 water treatment facilities. Each utility publishes a yearly water quality report, and it is worth reading yours for its own hardness figure.

What 7 grains per gallon looks like at home

Mineral film shows up first where water sits and dries. In an Orlando home that usually means the lower third of a glass shower door, the base of the kitchen faucet, the rim of the sink drain, showerhead nozzles and the inside of an electric kettle. Dark tile shows white spots; chrome turns dull; the dishwasher leaves a light film on glasses.

Humidity plays a part. Morning humidity averages 88 percent in Orlando, so a wet shower dries slowly and water stays on the glass longer. The longer it sits, the more minerals settle out in one spot.

Safe ways to clear mineral film

Mild acids dissolve mineral deposits, which is why diluted white vinegar or a commercial hard water cleaner works on glass and chrome. The care is in where you use them.

How cleaning visits will handle hard water

A One-Time Deep Clean treats shower glass for hard water spots and details faucets, including the bases and the area behind the handles, where film collects unseen. The same work is part of the Initial Deep Clean that starts every recurring plan. After that, regular Recurring House Cleans keep fixtures wiped and glass clear so the film never builds back to its starting point. See the deep cleaning guide for the full list.

Some glass cannot be fully restored. Years of minerals can etch the surface, leaving a permanent cloudiness that no cleaner removes. Catching spots early is the only real fix for that.

Older plumbing and newer homes

About 14 percent of homes inside Orlando were built before 1960, and older fixtures with worn finishes need gentler products than new ones. In the newer suburbs, where about 43 percent of Orange County housing dates from 2000 or later, the concern flips: matte black and brushed fixtures show mineral spots quickly and scratch easily, so soft cloths and mild cleaners matter just as much.

More for Orlando homes

Sources

  1. Orlando Utilities Commission, Water Services: www.ouc.com/about/water-services/
  2. City of Winter Park, Water Treatment: cityofwinterpark.org/departments/water-wastewater-utilities/water-treatment
  3. City of Lake Mary, 2025 Annual Drinking Water Quality Report: fl-lakemary.civicplus.com/342/2025-Water-Quality-Report
  4. Toho Water Authority, 2024 Water Quality Report (Central): tohowater.com/sites/default/files/2025-06/Toho%20CCR%20Central%202024.pdf
  5. Florida Climate Center (Florida State University), relative humidity normals: climatecenter.fsu.edu/products-services/data/other-normals/relative-humidity
  6. U.S. Census Bureau, American Community Survey 2024 1-year, table B25034 Year Structure Built (via Census Reporter): censusreporter.org/data/table/?table=B25034&geo_ids=16000US1253000
  7. U.S. Census Bureau, American Community Survey 2024 1-year, tables B25034 and B25024 for Orange County, FL (via Census Reporter): censusreporter.org/data/table/?table=B25034&geo_ids=05000US12095
FAQ · Hard water

Frequently Asked Questions

The questions Orlando homeowners ask most often about this topic, answered plainly.

The Orlando Utilities Commission reports an average hardness of 129 parts per million, or 7 grains per gallon. It draws that water from the Lower Floridan Aquifer. If you are on a different utility, such as Winter Park, Lake Mary or Toho Water Authority, check that utility's own water quality report for its figure.
Yes. OUC treats its water with an ozone process designed to remove unpleasant tastes and odors, and Winter Park's treatment also includes ozonation. If you notice an odor only from hot water taps, the water heater is a more likely source than the supply itself.
On glass, porcelain and most chrome, diluted vinegar is a safe way to loosen mineral spots from OUC's 7 grain water. Keep it off marble, travertine and other natural stone, which acids etch, and rinse and dry metal fixtures afterward.
Not necessarily. Kissimmee sits in Osceola County, where Toho Water Authority is the largest water provider, drawing from the Floridan Aquifer through 17 treatment facilities. Check the water quality report from your own utility for its mineral levels.
Treating shower glass for hard water spots is part of every One-Time Deep Clean, and most haze comes off. Glass that has been etched by years of minerals may stay slightly cloudy. Squeegeeing after each shower is the best way to keep the door clear afterward.

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