Should I shut off my water if my pipes freeze?
Short answer: Leave the water on and the affected faucet open while you thaw a frozen pipe, so melting water has an escape path and you can tell when flow returns. Shut the main immediately if you see a split, bulge, or leak, if you must leave the property during thawing, or if you cannot monitor the pipe. Locate and test the main shutoff before any cold snap.
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Call Now for Emergency Help(720) 319-807324/7 Emergency Call HandlingKey Takeaways
- Open faucet plus water on is the safer configuration while actively thawing and watching.
- Shut the main if the pipe is visibly damaged, or if you cannot be present.
- After shutting the main, open low faucets to drain residual pressure.
- A main shutoff that has not been operated in years may seize; test it annually.
- Know the curb stop location too, in case the interior valve fails.
The Two Scenarios
Scenario one: you are home, the pipe is accessible, and you are thawing it. Keep water on with the faucet open. When the ice clears, you will hear flow and can immediately check for leaks.
Scenario two: you are leaving, the pipe is inside a wall, or you already see damage. Shut the main, drain the system, and leave it off until the line is thawed and inspected or repaired.
How To Shut Off Correctly
- Find the main valve where the service line enters, typically a basement or mechanical room wall.
- Turn a gate valve clockwise fully, or rotate a ball valve lever a quarter turn.
- Open the lowest faucet in the house and a tub spout to drain the lines.
- Turn off the water heater if the system will be drained down.
- Leave a note or tag on the valve so anyone else in the home knows the status.
If the Valve Will Not Turn
Do not force a corroded gate valve; breaking the stem creates an unstoppable leak. Call the water utility to close the curb stop, then have a plumber replace the interior valve with a ball valve. Replacing an old main shutoff before winter is one of the cheapest risk reductions available.
Colorado and Denver Considerations
Denver metro homeowners who travel during winter should consider shutting the main and draining the system whenever the property will be empty during a cold stretch, particularly older homes with plumbing on exterior walls or in crawl spaces.
Exceptions and Important Considerations
- Homes with fire sprinkler systems must not have the sprinkler supply shut off without following the system requirements.
- Boiler and hydronic systems may need special handling before draining.
- If you have a well, shutting off at the pressure tank rather than a municipal main applies.
Related Questions
No, it does not affect thawing speed. It limits damage if the pipe is cracked.
If you are leaving during a freeze and shut the main, draining reduces the water available to escape from a split line.
Yes, if the frozen section is downstream of that valve. That isolates the risk while the rest of the house stays in service.
Once a year, before winter. Exercise it fully and confirm water stops.
Burst and Frozen Pipe Damage in Denver
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