How to decrease high water pressure in my home?
To decrease high water pressure in your home, you typically need to install a pressure reducing valve (PRV) on your main water supply line or adjust an existing one. High pressure can prevent damage to plumbing and appliances.
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Understanding and Addressing High Water Pressure
High water pressure in your home can lead to several problems, including noisy pipes, damaged appliances like dishwashers and water heaters, leaking faucets, and excessive water consumption. The most common cause is the municipal water supply delivering water at a higher pressure than recommended for residential systems, often above 80 PSI.
The primary solution for high whole-house water pressure is the installation or adjustment of a Pressure Reducing Valve (PRV). A PRV is a bell-shaped device typically located on the main water supply line where it enters your home, after the main shut-off valve. Its function is to sense the incoming water pressure and automatically reduce it to a safe and consistent level (usually between 40-60 PSI) before it circulates throughout your home's plumbing system.
Why High Pressure is an Issue
Pressures above 80 PSI can stress pipes, joints, and appliance components, leading to premature wear and failure. It can also cause a "water hammer" effect, where pipes bang and vibrate. Reducing pressure protects your investment in plumbing and appliances, conserves water, and eliminates irritating noises.
How a PRV Works
Inside a PRV, a diaphragm or piston is controlled by a spring and screw mechanism. When water flows through, the valve reduces the pressure by restricting flow. The adjustment screw allows you to fine-tune the output pressure to your desired setting. If your home already has a PRV, it might simply need adjustment or replacement if it's old or faulty.
Important Considerations and Exceptions
If high pressure is only present at one fixture, the issue might be a faulty aerator or faucet cartridge, not the whole-house supply.
Homes on private well systems often have a pressure tank and switch controlling water pressure, which would require a different adjustment method.
For apartment or condominium residents, the main PRV might be a building-level component that individual tenants cannot adjust. Consult building management or a professional.
Very old plumbing systems (e.g., galvanized pipes) may experience reduced flow even at normal pressures due to internal corrosion, which is a separate issue from high pressure.
Steps to Manage Your Home's Water Pressure
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Test your home's water pressure using a water pressure gauge attached to an outdoor hose bib or laundry room faucet.
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Locate your home's main water shut-off valve and, if present, the existing pressure reducing valve (PRV) on the main water line.
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If an existing PRV is found, attempt to adjust it by loosening the locking nut and turning the adjustment screw counter-clockwise to decrease pressure.
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If no PRV is present or the existing one is faulty, consider professional installation or replacement by a licensed plumber.
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Re-test the water pressure after any adjustments or installations to ensure it falls within the recommended 40-60 PSI range.
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