A few drops immediately after shutoff can simply be water draining from the showerhead or pipe, but dripping that continues for minutes or hours usually means the valve is not sealing completely. Mineral deposits, a worn cartridge, or damaged seals are common causes, and duration and location help distinguish them.
Time how long the dripping continues
If dripping stops within a few minutes and does not return, residual drainage from the showerhead may explain it. If it continues at a steady rate long after shutoff, the valve is passing water and needs attention.
Confirm whether water comes from the showerhead or another joint
Water from the showerhead connection, arm, or hose points toward a seal or threaded joint; water that continues from the spray holes with the control off points more toward the shower valve.
Mineral deposits can prevent moving parts from sealing
In hard-water areas, scale on a cartridge or valve can prevent full closure. Cleaning external parts does not always fix the internal seal; follow the manufacturer’s service procedure if the cartridge is intended for homeowner maintenance.
Shut off water before disassembling the valve
A cartridge repair opens a pressurized water path. Locate the proper shutoff, verify flow has stopped, and do not open the wall or valve if the supply cannot be isolated safely.
Sources
- U.S. Environmental Protection Agency WaterSense — Home Maintenance — Household maintenance related to water, leaks, toilets, pressure, and efficient use.