Quick Answer:
A high-pitched squeal that only happens when several fixtures run at once usually means the meter or its valve is partially restricted or has a worn seat/washer. First open the valve fully and test. If the noise continues after simple checks, call your water utility or a plumber — the meter area is often utility-owned and can require specialist work.
Why This Happens
When water flow increases, pressure changes and fast-moving water can make a valve seat, washer or loose part vibrate. Common causes are:
- Partially closed or restricted valve creating a narrow flow path.
- Worn or damaged washer or valve seat that vibrates under high flow.
- Sediment or debris stuck in the valve or meter internals.
- Related problems at the property shutoff or curb stop — a noisy curb stop can cause similar symptoms like banging or vibration if it’s not operating cleanly. If you suspect the curb stop, have it inspected by the utility or a pro.
Step-by-Step What to Do
1. Observe and confirm the pattern
- Run a heavy demand (both shower and another tap or washing machine) to reproduce the squeal.
- Note when it starts, how long it lasts, and whether it stops immediately when you reduce flow.
2. Open the valve fully
- Locate the meter valve (usually next to the water meter or main shutoff). Turn it fully open and listen again under the same heavy demand. Many squeals disappear when the valve is truly wide open because flow becomes less turbulent.
- Do this cautiously — do not force a stuck valve. If it resists, stop and call the utility or a plumber.
3. Check washer wear
- If the valve design gives access to a replaceable washer or seat and you are comfortable doing light maintenance, shut the main off downstream, relieve pressure at a tap, and inspect the washer for grooves or damage.
- If the washer is worn, replacing it often removes the vibration. If you don’t see an obvious washer or you’re unsure, stop and call a pro — meters and some valves are utility property and can be damaged by improper handling.
4. Test under load again
- Restore normal service and run the same heavy demand to see if the noise is gone. If it’s reduced, the repair or adjustment helped. If it persists, the issue is likely inside the meter or in a valve you should not disassemble.
5. Note temporary measures and record symptoms
- Document when and how the squeal happens, and what you tried. This helps a technician diagnose the problem quickly.
What Not to Do
- Do not operate the valve partially open long term — leaving a valve half-closed often makes noise worse and wears parts faster.
- Do not force a stuck valve. Forcing can damage the valve, meter or piping and create leaks.
- Do not attempt major meter repairs yourself. If the meter area shows signs of ownership by the utility, stop and contact them.
- Avoid using random lubricants or household oils on valves — that can make things worse or contaminate the water. If the valve won’t close or seal, do not struggle with it; a **meter valve stuck open** needs a professional or utility service call.
When to Call a Professional
- The squeal continues after you open the valve fully and check the washer.
- You cannot access or safely inspect the valve or washer, or the valve is hard to move.
- There is a leak, visible damage, or loss of supply when the valve is adjusted.
- The water meter is suspected to be the source — meters are often utility-owned and should be serviced by the utility or a licensed plumber.
Safety Notes
- Turn off nearby fixtures and relieve pressure before loosening any valve components.
- If you are unsure whether the meter or valve is utility property, contact the water utility first — unauthorized meter work can be illegal or unsafe.
- Wear gloves and eye protection when working near valves. Keep kids and pets away from the work area.
- Do not use excessive force on fittings or valves. Use proper tools and call a pro if a part won’t move.
Common Homeowner Questions
- Why does the noise only happen when several fixtures run? — The higher flow rate causes pressure changes and vibration that don’t occur at low flow.
- Can I silence it by tightening something? — Tightening without the right repair often won’t help and can cause leaks; inspect and replace worn parts or call a pro.
- Is this an emergency? — Not usually, but if the noise comes with leaks, loss of water, or a valve that won’t operate, call a professional promptly.
For more related articles, see the Curb Stop & Meter Valve Problems hub.