Plumber in Katy, TX

The Katy area sits on expansive clay soil. This kind of soil swells when it gets wet and shrinks when it dries out. After a wet spring and a dry August, that soil can move a lot.

Almost every home here is built on a slab-on-grade foundation, with water and drain pipes running under or through the concrete. When the soil moves, the slab moves. When the slab moves, the pipes under it bend and twist.

Over time, that stress cracks joints and fittings. That is how a slab leak starts. Older copper pipe and cast iron drain lines are most at risk, because they are rigid and have been through more of these cycles.

You can lower the risk. Keep water draining away from the foundation. Fix small leaks early, since a leak soaks one patch of soil and worsens movement. Avoid planting large trees over sewer lines.

Katy-area groundwater comes from the Gulf Coast Aquifer, which runs through mineral-rich rock. That produces hard water, meaning water with a lot of dissolved calcium and magnesium.

Hard water leaves scale buildup inside pipes, water heaters, and fixtures. You see it as white crust on a faucet aerator or showerhead. Inside a water heater, scale settles on the bottom and makes the unit work harder.

Here’s where most plumbing sites get it wrong. There is no single “Katy water.” The City of Katy runs its own groundwater plants, spread across Harris County, Fort Bend County, and Waller County. Homes outside the city limits are served by dozens of separate Municipal Utility Districts, and each one is its own water system.

So hardness, pressure, and treatment all vary by neighborhood.

You can look up your own numbers. Every community water system must publish an annual Consumer Confidence Report and give it to customers by July 1 each year, under rules enforced by the Texas Commission on Environmental Quality. That report lists your disinfectant levels and water characteristics. Search your water district’s name plus “water quality report.”

If your report shows high hardness, a water softener or water filtration system may be worth it. We can talk through options during a water treatment visit.

This is happening now, and it affects real parts of your house.

For decades, West Harris County pumped its water from underground wells. The Harris-Galveston Subsidence District ordered a large shift to surface water to slow ground sinking. The Texas Legislature created the West Harris County Regional Water Authority in 2001 to manage that change for local Municipal Utility Districts and the City of Katy.

That water now comes from Lake Houston, gets treated, and travels through large transmission lines to districts across the Katy area. A regional pump station on Fry Road began delivering it in 2026.

As districts make the switch, many are also changing their disinfectant from chlorine to chloramine. Chloramine is chlorine combined with ammonia. It lasts longer in long pipe runs, which is why utilities use it.

Water treated with chloramine that meets EPA standards is safe to drink. More than one in five Americans already drinks it.

But chloramine is harder on rubber than chlorine is. It attacks the soft parts that hold seals in your plumbing:

• Toilet flappers and fill valves
• Rubber washing machine hoses
• O-rings and gaskets inside faucets
• Seals and gaskets on water heaters

If your toilet flapper feels mushy, leaves black smears, or your toilet starts running on its own, that is a common sign. If you got a notice from your water district about a disinfectant change, ask for chloramine-rated replacement parts. A standard black rubber part will just fail again.

Most homes with a “Katy, TX” mailing address are not inside the City of Katy. The city itself is small, with about 26,000 residents. The Greater Katy area is far larger and holds several hundred thousand people.

The City of Katy sits where Harris County, Fort Bend County, and Waller County meet. Everything around it is mostly unincorporated county land, and much of it falls inside the City of Houston’s extraterritorial jurisdiction.

For example, Cinco Ranch spans unincorporated Fort Bend and Harris County. Nottingham Country carries a Katy ZIP code but is not in the city. Neither is Grand Lakes, Firethorne, or much of Cross Creek Ranch.

Why this matters to you:

1. Permits. A plumbing permit for a water heater replacement, repipe, or gas line comes from whichever authority covers your address. That may be the City of Katy, a county office, or the City of Houston. It is not the same everywhere.
2. Inspections. Different authorities, different inspection processes.
3. Utilities. Your water and sewer provider depends on your district, not your mailing address.
4. Hiring. A plumber who only works inside city limits may not be set up for your address, even though your mail says Katy.

We serve homes across all three counties in the Katy area. If you are not sure which authority covers your street, tell us your address, and we will sort it out.

Not sure who to call about a problem at your address? Call (832) 898-4922.