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What is a shut-off valve?

In home water plumbing, a shut-off valve stops the water supply. A ball-type house valve closes with a quarter turn (1/4 turn); a gate type uses a wheel. Identify which type you have before operating it, and avoid overturning a gate valve.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. With an outside meter, look near the water heater or where the service enters the property to locate the main valve. Source: WSSC Water, read 2026-11-04.
  2. Identify whether the house valve has a wheel or a straight handle before discussing its operation. Source: Carmichael Water District, read 2026-11-04.
  3. After the house valve is closed, check a faucet: water should stop if the valve is working properly. Source: Carmichael Water District, read 2026-11-04.
  4. For a home missing a water shut-off valve, request a written installation scope from a plumber that identifies the new household shut-off valve. Source: Seattle Public Utilities, read 2026-11-04.
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Where should I look to find my shut-off valves?

Look for the household control at the water-service entry; utility guidance describes both indoor locations and outdoor layouts, plus separate controls at fixtures. “If you have an outside meter, the main valve is usually located near the water heater or where the water service enters the property.” Source: WSSC Water, read 2026-11-04. For Carmichael Water District’s outdoor layout, “Your house valve is typically located on the outside of your home or business.” Source: Carmichael Water District, read 2026-11-04. “Other valves may be located near plumbing appliances such as sinks and toilets.” Source: Mohawk Valley Water Authority, read 2026-11-04.

How do I turn off the water at my home?

Match the operation to the handle you have: Carmichael Water District describes a wheel-operated gate type and a ball type requiring only a quarter turn. “A gate valve is operated by turning the wheel clockwise until the water is off.” Source: Carmichael Water District, read 2026-11-04. “Be careful not to overturn the valve or it may break in the closed or open position.” Source: Carmichael Water District, read 2026-11-04. “A ball valve is operated by turning the handle a quarter turn clockwise until the water is off.” Source: Carmichael Water District, read 2026-11-04.

How should I maintain the main shut-off valve?

For routine upkeep, Mohawk Valley Water Authority recommends occasional exercise of the household control and restoring its original setting afterward. “Give the valve a turn occasionally to prevent possible corrosion build-up (if the valve is already stiff from corrosion, a little WD-40 will dissolve the build-up).” Source: Mohawk Valley Water Authority, read 2026-11-04. “Don’t forget to turn the valve back to the position it was in originally when you’re finished with the test!” Source: Mohawk Valley Water Authority, read 2026-11-04.

What if my main shut-off valve won’t work in an emergency?

In Mohawk Valley Water Authority’s service area, a failed household control is a reason to request the utility’s emergency response. “We’ll send someone out to shut your water off at the “curb-stop.”” Source: Mohawk Valley Water Authority, read 2026-11-04. Seattle Public Utilities separately lists this reason for needing a meter shutoff: “There are a couple of situations in which you still may need to shut off water at the meter: Home valve is broken, damaged or gets stuck.” Source: Seattle Public Utilities, read 2026-11-04.

Can I turn my water meter on or off?

In Seattle, determine the meter’s operating type first, because customer access depends on having the top shut-off model described below. “Important: Meters with top shut-off (TSO) valves (shown in photo) are the only types of meters that customers can shut off themselves.” Source: Seattle Public Utilities, read 2026-11-04. “Older meters require a special tool to shut off, and only SPU crews can operate these types.” Source: Seattle Public Utilities, read 2026-11-04.

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