Your shower faucet is most likely leaking because one or more internal parts have worn out, loosened, or failed.
Common causes:
1. Worn washers, O-rings, or seals: These small rubber parts stop water from escaping. Over time they dry out, crack, or flatten, especially in older faucets.
2. Damaged cartridge or valve: In many modern shower faucets, a cartridge controls water flow and temperature. If it is worn or clogged with mineral buildup, water can leak even when the faucet is off.
3. Loose or corroded parts: Screws, valve stems, or connections may loosen over time. Corrosion can also prevent the faucet from closing tightly.
4. Mineral buildup: Hard water deposits can interfere with the faucet’s internal sealing surfaces, causing drips or constant leaking.
5. High water pressure: If water pressure is too strong, it can force water past seals and make a small problem worse.
6. Faulty shower diverter: If the leak appears when switching between the tub spout and showerhead, the diverter may be the issue.
7. Hidden pipe or wall leak: If water is coming from around the handle, behind the wall, or dripping even when the faucet seems off, the leak may be in the plumbing, not just the fixture.
Why it matters:
A small shower leak can waste a lot of water, raise utility bills, and eventually damage walls, flooring, or the subfloor.
What to do:
Turn off the water supply if needed, identify whether the leak is from the handle, showerhead, or spout, and inspect the cartridge, washers, and seals. If the leak is behind the wall or you’re unsure, call a plumber.