White crust on faucets and showerheads is usually mineral buildup left behind by hard water. When water evaporates, minerals like calcium and magnesium stay behind and slowly harden into a chalky, white or tan layer.
How the Buildup Forms
Hard water carries dissolved minerals. Each time water dries on a faucet, showerhead, or glass shower door, a thin film of those minerals is left behind. Over weeks and months, the layers stack up. Heat speeds up the process, so hot water fixtures and showerheads often build up crust faster.
Effects on Fixtures and Heaters
- Clogged showerhead nozzles can cause weak or uneven spray
- Faucet aerators can block up and lower water flow
- Crust around handles can make them stiff to turn
- Buildup can wear down finishes and rubber seals
The same minerals that crust on the outside also collect inside your plumbing. Inside a water heater, they settle as sediment at the bottom of the tank, which can lower efficiency and cause popping noises.
Cleaning Light Buildup
For removable parts like aerators and showerheads, soaking them in white vinegar for a few hours can soften the crust. Rinse well before putting them back, and make sure the rubber washers are still in place. For fixed faucets, wrap the area in a cloth soaked with vinegar for a while, then wipe clean. Avoid harsh scrubbers that can scratch the finish, and check the fixture maker’s cleaning advice first.
Longer-Term Options
Wiping fixtures dry after use slows buildup. Some homes add a water softener or a filter to reduce mineral levels. A plumber can explain whether treatment makes sense for your water and which fixtures are most affected.
If your hot water has started to run short or the tank is noisy, flushing or repairing the water heater may help. For general questions about hard water and your fixtures, you can ask a plumber about your water at (833) 603-1840.