Fixing Low Water Pressure in the Shower

Checking the Shower Head

The most common cause of low shower pressure is a clogged shower head. Mineral deposits from hard water gradually block the spray nozzles, reducing flow. Remove the shower head by unscrewing it from the shower arm. Soak the entire head in a bowl of white vinegar for 2 to 4 hours (overnight for heavy buildup). Use a toothpick or needle to clear individual nozzles. Rinse thoroughly and reinstall. If your shower head has a flow restrictor (a small plastic disc inside the head or connector), removing it can improve flow, though this increases water usage.

Valve and Plumbing Issues

If cleaning the shower head does not help, the problem may be with the shower valve. Single-handle pressure-balancing valves have a balancing spool that can become clogged with debris, restricting flow. Turn off the water, remove the handle and cartridge, and clean the valve body interior. Check the supply shut-off valves (if accessible) to ensure they are fully open. Old gate-style valves can become partially seized, restricting flow even when they appear to be open.

Pipe Size and Distance

In some homes, the shower is supplied by undersized pipes (3/8-inch instead of 1/2-inch) or is located far from the water heater, resulting in naturally lower pressure. If multiple fixtures run simultaneously (such as when someone flushes a toilet while you shower), pressure drops further. Solutions include upgrading supply pipe size, installing a pressure-balancing valve that maintains consistent pressure, or adding a shower booster pump designed for residential use.

Whole-House Pressure Issues

If low pressure affects your entire home, check the pressure-reducing valve (PRV) on your main water line — it may be set too low or malfunctioning. Use a pressure gauge on an outdoor hose bib to measure your water pressure — it should be between 40 and 80 psi. If pressure is below 40 psi, adjust the PRV by turning the bolt on top clockwise to increase pressure. If you do not have a PRV and pressure is consistently low, contact your water utility to check the municipal supply pressure to your home.