What causes low water pressure in a shower?
Common Culprits
The most frequent cause is a clogged showerhead. Mineral deposits from hard water can block the holes, reducing flow. Unscrew the showerhead and soak it in vinegar overnight, then scrub with a brush. If the showerhead has a flow restrictor, it may be limiting pressure—some can be removed.
Check the shower valve: a single-handle faucet might not be opening fully if the cartridge is worn. Also, look for a shut-off valve on the shower line that might be partially closed. If only the hot water is low, the issue could be sediment in the water heater.
- Soak showerhead in vinegar to remove mineral buildup.
- Check for a flow restrictor and remove if desired.
- Test other faucets to see if the problem is whole-house.
- Inspect the water heater for sediment.
When It's a Bigger Issue
If other fixtures also have low pressure, the problem may be with your home's main water valve, a pressure regulator, or the municipal supply. A pressure regulator that's failing can cause low pressure throughout the house. Contact your water utility if neighbors are also affected.
In older homes, galvanized pipes can corrode and narrow over time, restricting flow. Repiping is a major fix. For a quick boost, consider a low-flow showerhead designed to maintain pressure, or a showerhead with a smaller orifice.
- Check main water valve and pressure regulator.
- Ask neighbors if they have low pressure.
- Consider a pressure-boosting showerhead.
- For corroded pipes, consult a plumber about repiping.
Common mistakes
- Assuming it's the showerhead when the whole house has low pressure.
- Removing the flow restrictor can increase flow but may raise water bills.
- Using harsh chemicals to clean a showerhead can damage the finish.
