Bathtub Leaking in Arlington? 5 Places Tubs Leak and How to Find Them

Bathtubs leak in five common places: the overflow drain gasket behind the tub, the drain shoe and strainer under the tub, the faucet or diverter valve inside the wall, cracked caulk or grout at the tub edge, and the supply pipes that run under the slab. Simple water tests tell you which one it is. Call (817) 285-5426 if water keeps showing up after you check.

Our leak detection Arlington TX techs find hidden tub leaks with moisture meters, thermal cameras and pressure tests before any wall or floor is opened.

What are the 5 places a bathtub leaks?

1. Overflow gasket. The round cover under the faucet has a gasket behind it. When it hardens, water leaks only when the tub is filled high.
2. Drain shoe. The drain fitting under the tub can lose its seal. Water leaks every time the tub drains.
3. Valve or diverter. A leaking cartridge or a loose pipe joint behind the handle leaks inside the wall whenever the water is on, or all the time.
4. Caulk or grout. Splashing water gets behind cracked caulk at the tub edge and runs down into the floor.
5. Supply pipes under the slab. The hot and cold lines to the tub often run under the slab in Arlington homes. A leak there shows up as a warm floor or a damp wall next to the tub.

How do you find which one is leaking?

Test one part at a time. Fill the tub with a few inches of water and plug it, then watch for a leak. Next, fill above the overflow and check again. Then let the water drain and watch. Finally, run the shower with the drain closed and a towel over the walls. The step where the leak shows up points to the source.

• Leak only when the tub drains: drain shoe or drain line.
• Leak only when filled high: overflow gasket.
• Leak with the water running: valve, diverter or shower arm.
• Leak after showers only: caulk, grout or the shower door.
• Leak with all water off: a pressurized supply pipe. Do a meter test.

What damage does a bathtub leak cause?

On a slab home, a tub leak soaks the floor, baseboards and the wall on the other side, then grows mold. On a second floor, it stains the ceiling below. Arlington's humid summers make mold grow faster in wet framing. Fix the leak within a few days and dry the area fully.

If the stain is on a ceiling, read our leaks in walls or ceilings guide. If the smell is musty, see musty smell from a hidden leak.

When is it a slab leak?

If the floor near the tub is warm, the water meter moves with all water off, or the damp spot is on the far side of the wall, the leak may be in a supply pipe under the slab. That needs a slab leak search. In Arlington, slab leak detection usually costs about $250 to $600, and basic leak detection about $150 to $400.

General estimates for Arlington, TX in 2026. Your exact price is confirmed before any work begins.

Our slab leak detection Arlington visits pinpoint the leak so only one small spot is opened. Learn more about the hot water slab leak signs, or compare repairs in slab leak repair options.

Can you fix a bathtub leak yourself?

Recaulking the tub edge and replacing an overflow gasket are DIY jobs for many homeowners. A drain shoe, valve cartridge or pipe joint inside the wall usually needs access through a panel or the wall behind the tub. Leaks under the slab need a pro. If you have a shower stall too, our shower pan leak guide covers how pans fail.