Katy

Water Filtration Systems in Katy

Better Water for the Fort Bend Side of Katy

Katy grew up around rice farming, and the old dryer silos beside the railroad still stand as a reminder of it. The name covers a lot more ground today. The City of Katy sits where Harris, Waller and Fort Bend counties meet, and a Katy mailing address reaches well beyond the city limits.

Fort Bend Water Pros works on the Fort Bend County side: the city's Fort Bend portion and communities such as Cinco Ranch (most of which lies in Fort Bend County), Grand Lakes, Grand Mission, Seven Meadows and Firethorne along FM 1463. Whether you live near LaCenterra or off the Westpark Tollway, what reaches your tap depends less on the city name than on the district that pipes water to your street.

Spotted glasses, a crusted shower head or a new chlorine smell since your district changed disinfectants: we start every Katy job the same way. We find the system that serves your address, read its latest report, and design around what it says. Call 281-979-3405 to talk it through.

Why Katy Water Changes From One Neighborhood to the Next

The City of Katy runs its own water system. Outside the city limits, water usually comes from a municipal utility district (MUD), a small public district that runs its own wells, buys water from a neighbor, or both. Our dataset groups 35 water systems with figures we can cite under this part of the county, and they don't deliver the same water.

• Groundwater or surface water. The City of Katy's 2025 report names groundwater from the Gulf Coast Aquifer as its source and free chlorine as its disinfectant, averaging 1.12 mg/L. Many districts nearby blend their wells with treated surface water from the North Fort Bend Water Authority (NFBWA) and report chloramine instead: Kingsbridge MUD's 2025 average was 2.27 mg/L and North Mission Glen MUD's was 1.51.
• Hardness. State samples for the City of Katy ran from 6.4 to 9.1 grains per gallon (gpg) between January 2025 and April 2026. Fort Bend County MUD 30, one of the larger districts, ran 6.1 to 7.4 gpg from April 2025 to July 2026, and Fort Bend County MUD 58 ran 4.5 to 7.4 from February 2024 to February 2026. Cinco MUD 1, which supplies groundwater to several other Cinco districts, ran 6.4 to 9.6 gpg across 20 samples from December 2023 to May 2026. On the U.S. Geological Survey's scale, 3.5 to 7 gpg is moderately hard and 7 to 10.5 is hard.

Those numbers describe what each system delivered on the sample dates, not your faucet today, so we also ask what you're seeing at home. More on our hard water by system page.

The NFBWA Chloramine Conversion and What It Means for Filters

The Texas Legislature created the North Fort Bend Water Authority to cut groundwater pumping, and the land subsidence it causes, in northern Fort Bend County. It supplies surface water to most of the MUDs and cities inside its boundaries. Its pool chemistry guide says all surface water and some groundwater in Fort Bend County is treated with chloramine, and its surface water conversion page says districts that take its water make plant improvements "including conversion to chloramine disinfection."

That conversion reached more of Cinco Ranch in 2026. On June 10, Cinco MUD 5 posted that on or after June 30, 2026 it would change its disinfectant from chlorine to chloramines before receiving NFBWA surface water later in the year. Cinco MUD 14 and Cinco MUD 7 posted notices for the same date. What a conversion changes in your house:

• A filter built for chlorine may fall behind. Ordinary activated carbon reduces chloramine slowly and wears out sooner. Chloramine calls for catalytic carbon in a tank sized for your flow.
• RO pre-filters do more work. An under-sink reverse osmosis system depends on carbon pre-filters suited to chloramine to protect its membrane.
• Fish tanks and home dialysis need attention. The Cinco notices warn that chloraminated water may be toxic to fish and can cause problems for people who depend on dialysis machines.
• Hardness can drift. NFBWA notes that most local groundwater is high in minerals and surface water is not, so a district's hardness can shift as its blend changes.

See which systems report chloramine on our chloramine by water system page, or read about chloramine conversions in Fort Bend MUDs.

One Katy ZIP Code Can Hold Several MUDs

A Katy address doesn't tell you who supplies your water, and it doesn't mean you live in the City of Katy. The 77494 ZIP code takes in Seven Meadows, Firethorne and parts of Cinco Ranch and Grand Lakes, which are served by different districts. Grand Lakes alone has Grand Lakes MUD 1, 2 and 4, and our dataset lists more than a dozen systems with "Cinco" in their names.

So we never quote a Katy home from a ZIP code. Your water bill names your district, or send us your address and we'll look it up. New to MUDs? Start with what a MUD is.

Why Choose Fort Bend Water Pros

We are based in Fort Bend County, and we don't treat Katy as one big "Houston water" market. When we recommend equipment, you see the system we looked up, the figures we used and the dates behind them.

Your quote is detailed line by line: equipment, labor, site work, exclusions, maintenance intervals and how long the price holds. We book nothing until you approve the quote. Installation is performed by expert installers working with us.

Our Water Treatment Options in Katy

Water softeners remove the calcium and magnesium behind scale on fixtures, film on shower glass and buildup in tankless water heaters. On chloraminated water we put a catalytic carbon filter ahead of the softener.

A whole-home filter takes the disinfectant taste and smell out of every faucet and shower head in the house. If your district converted recently, we check whether your existing media suits chloramine before suggesting anything new.

Reverse osmosis gives you very low-mineral drinking and cooking water from its own faucet at the kitchen sink.

Run a restaurant, café or office? See commercial water filtration in Katy. For upkeep on a system we installed, see service and maintenance.