A pressure reducing valve, or PRV, controls how much water pressure enters your home. When it starts to fail, the warning signs often show up gradually, which makes them easy to overlook until damage is already happening.
Signs your PRV may be failing include:
Low or inconsistent water pressure. You may notice weak flow at multiple faucets or pressure that drops sharply when more than one fixture is running. This often worsens over time and can affect the entire home.
Unusual noises when water is running. Humming, squealing, or knocking sounds when faucets turn on are commonly linked to unstable pressure inside the valve and indicate added stress on your plumbing system.
Excessively high water pressure. Some PRVs fail by allowing too much pressure into the home. While this may not be obvious right away, it can wear out pipes, fixtures, water heaters, and appliances. Banging pipes, known as water hammer, are a common warning sign.
Visible leaking near the valve. Because PRVs are usually installed near the main water line, leaks may show up as soggy soil, standing water in the valve box, or unexplained moisture near the foundation.
The most important thing to know is that waiting for a PRV to fail completely can lead to burst pipes, appliance damage, and expensive emergency repairs. That’s why Mainstream recommends having pressure issues evaluated early. Our technicians test water pressure, inspect the PRV, explain what’s happening in plain terms, and provide honest recommendations. If repair or replacement is needed, it’s handled correctly so your plumbing system is protected long-term.
