High Water Pressure: Why It Damages Your Home and What to Do About It

What Is Normal Water Pressure?

Healthy residential water pressure falls between 40 and 80 psi. Most plumbers aim for 55 to 65 psi as an ideal operating range — strong enough for good flow at every fixture, gentle enough not to stress your plumbing system.

Municipal water systems deliver water at much higher pressures (often 80 to 150 psi) to overcome distance and elevation in the supply network. A pressure reducing valve (PRV) on your home's main line is supposed to step that down to a safe level before it reaches your pipes, fixtures, and appliances.

Signs Your Water Pressure Is Too High

Because pressure operates invisibly inside your walls, you have to know what to look and listen for:

• Banging or thumping pipes when you turn off a faucet quickly — called "water hammer." This is shock wave energy from water stopped suddenly under high pressure.
• Faucets and shower valves that wear out faster than they should — internal washers and cartridges degrade much more quickly under sustained high pressure.
• T&P relief valve on your water heater discharging periodically — the valve opens when pressure inside the tank exceeds its set limit, which happens more often when incoming pressure is too high.
• Appliance hose failures — washing machine supply hoses and dishwasher connections are rated for pressure limits. Above 80 psi, these connections are under constant stress and fail earlier.
• Unusually high water bills without a visible leak — more water flows through fixtures at higher pressure, even with the same usage habits.
• Short faucet or toilet life — valves and flappers that should last years failing within months.

How to Check Your Water Pressure

This is a five-minute job any homeowner can do.

1. Purchase a water pressure gauge with a garden hose threaded fitting (typically $10 to $20 at any hardware store or home center).
2. Attach it to an outdoor hose bibb or laundry room bib.
3. Make sure no other water is running inside the house — no dishwasher, washing machine, irrigation, or open faucets.
4. Open the bibb fully and read the gauge. This is your static pressure.
5. Check it at different times of day — municipal pressure often spikes at night when overall demand drops. A reading above 80 psi at any point is a problem.

The Role of the Pressure Reducing Valve (PRV)

A PRV is a bell-shaped fitting installed on the main water line, typically where it enters the house or near the meter. Most homes built after the 1980s have one. Homes on well water have different pressure management but similar issues.

PRVs have two common failure modes:

• Sticking open: The valve fails to restrict pressure and full municipal pressure enters the home. This is the more dangerous failure.
• Sticking closed: The valve over-restricts pressure and flow drops house-wide — this is the cause of many low-pressure complaints.

PRVs also have a set-point that can drift over time. A plumber can test the outlet pressure with a gauge and confirm whether the PRV is performing correctly.

What a Plumber Does to Fix High Water Pressure

1. Pressure test: Measure inlet and outlet pressure across the PRV to diagnose whether the valve is the issue or whether the PRV is simply set too high.
2. Adjust the PRV set-point: If the PRV is functioning but set above the recommended range, the adjustment screw on the PRV body can bring the outlet pressure down to the target range. This is usually a 15-minute fix.
3. Replace the PRV: If the valve has failed internally, it needs to be replaced. This requires shutting off the main water supply to the house.
4. Inspect and replace T&P valve: If the water heater's T&P valve has been cycling frequently due to high pressure, it should be replaced at the same time to restore its reliability as a safety device.

The Appliance and Pipe Damage You Are Preventing

Installing or servicing a PRV is not a major plumbing project — it typically takes less than an hour. The protection it provides extends the life of:

• Your water heater (especially the T&P valve and tank connections)
• Washing machine supply hoses
• Dishwasher water inlet valves
• Ice maker supply lines
• Every faucet, toilet fill valve, and showerhead in the house

The cost of a burst washing machine supply hose — which can flood a home in under an hour — far exceeds the cost of having a properly functioning PRV.

When to Call a Licensed Plumber

• Your gauge reads above 80 psi.
• You hear water hammer when shutting off faucets or valves.
• Your water heater's T&P valve is opening or has discharged recently.
• Faucets and appliances are wearing out faster than expected.
• You do not know whether your home has a PRV.

Alberto Plumbing tests water pressure and installs or replaces PRVs throughout Pflugerville, Round Rock, Austin, and Hutto. Call (512) 429-6933 — Jose A. Vital (TX Master Plumber M-39647) offers free assessments and same-day service.