Why Is My Bathtub Faucet Dripping?

A dripping bathtub faucet is more than an annoyance—it can waste hundreds of gallons of water each month and increase your utility bills. If your tub spout continues to drip even when the handles are fully shut off, there’s almost always an internal part failing inside the shower valve.

Top Reasons Your Bathtub Faucet Is Dripping

1. A Worn-Out Cartridge

Most modern tub/shower valves use a cartridge that controls the mix of hot and cold water. When the cartridge becomes worn or cracked, water slips through even when the faucet is “off,” causing a steady drip from the spout.

2. Failing Washers or Seats

Older two-handle bathtub faucets use rubber washers that press against valve seats to stop water flow. Over time, washers harden or wear down, and valve seats corrode—making it impossible to create a watertight seal.

3. A Faulty Diverter

If your tub spout drips when the shower is running—or keeps dripping afterward—the diverter may be worn. A failing diverter allows water to escape back through the tub spout instead of fully redirecting it to the showerhead.

4. High Water Pressure

Excessively high household water pressure can force water past seals and cartridges. If you notice dripping at multiple fixtures, pressure could be the root cause.

5. Internal Pipe or Valve Body Damage

Though less common, corrosion or cracks inside the valve body or connected piping can cause inconsistent leaks. This requires professional diagnosis.

When to Call a Plumber

If tightening the handles does nothing, or if you continue to hear water running inside the wall, it’s time for a professional repair. Replacing cartridges, valve seats, or diverters typically requires special tools—and incorrect installation can worsen the leak.