Symptoms
- Faucets spray forcefully or splash excessively
- Frequent water hammer or banging pipes
- Appliance hoses or fittings failing more often than expected
- Toilet fill valves or supply lines wearing out quickly
Likely causes
- CommonNo pressure-reducing valve installed on the main lineSome municipal water supplies deliver pressure above the safe range for household plumbing without a regulator to bring it down.
- CommonExisting pressure-reducing valve failed or set too highA PRV can fail in a way that allows full municipal pressure through rather than regulating it.
- PossibleNaturally high municipal supply pressure, especially at lower elevations or near pumping stationsSome areas simply have higher baseline pressure from the utility, making a home regulator essential.
What to do
- Test your water pressure using a gauge that threads onto an outdoor spigot or a washing machine connection.
- Compare the reading to the recommended range of 40–60 psi for residential plumbing; consistently above 80 psi is considered high.
- Check whether a pressure-reducing valve is already installed near the main water entry point.
- If none exists, plan to have one installed, since retrofitting typically requires cutting into the main line.
- If one exists but pressure still reads high, it may need adjustment (if adjustable) or replacement if failed.
- In the meantime, water hammer arrestors at individual fixtures can reduce the noise and shock impact while you arrange for a permanent fix.
- After installing or adjusting a PRV, retest pressure at multiple fixtures to confirm it's now within the safe range.
Tools and parts
- Water pressure gauge
Pressure-reducing valveSearch: “water pressure reducing valve for home”
When to call a pro
Call a plumber to install or replace a pressure-reducing valve, since it involves cutting into the main supply line.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.