The short answer
What Causes Winter Leaks
Winter leaks usually start with water left in the pipes. When temperatures drop below freezing, that water turns to ice, expands, and creates pressure against the pipe walls. The pressure can crack PVC, copper, or poly pipe, and it can push apart joints and fittings that were never designed for that force.
Another common culprit is a damaged backflow preventer or valve. These parts hold small amounts of water even after you drain the system. If that water freezes, the valve body can split, and you will see a steady drip or spray once the ice melts. Even a tiny crack can leak for days after a cold snap.
How to Find the Leak
Start by turning off the water supply at the shutoff valve, usually located inside your home or in a crawlspace. Then walk the entire system and look for wet spots, frost lines, or bulging sections of pipe. Pay close attention to joints, elbows, and where the pipes enter the ground, because those areas freeze first.
If you cannot see the leak, turn the system on briefly while someone watches the yard for pooling water or geysers. You can also check the pressure gauge if you have one; a sudden drop often points to a break. For underground lines, look for unusually green or soggy patches of grass, which can indicate a slow leak below the surface.
- Turn off the water at the shutoff valve first
- Inspect exposed pipes for cracks or frost
- Check valves and backflow preventers for splits
- Run the system briefly and watch for water
- Look for wet soil or pooling in the yard
What to Do Right Away
Act quickly to limit water damage. Shut off the main valve to stop the flow, then drain the system again by opening the drain valves and blowing out any remaining water with an air compressor if you have one. Move furniture and rugs away from the leak area, and mop up standing water to keep it from soaking into drywall or flooring.
If the leak is inside a wall or under the house, the water can spread fast and cause structural problems. Remove wet carpet or padding if you can, and set up fans or a dehumidifier to dry the area. For large amounts of water, you might need to call local water damage pros to extract the moisture and prevent mold from taking hold.
When to Call for Help
Some leaks are simple to fix yourself, like tightening a loose fitting or replacing a cracked pipe section. But if the leak is underground, under a slab, or inside a wall, you may need professional help. Local water damage pros can locate hidden leaks using specialized equipment and clean up the mess safely.
If you live in Rockwall, keep your shutoff valve location written down so you can find it fast during a cold snap. A professional can also help with the cleanup after the leak is stopped, including drying out affected drywall, insulation, and subflooring. They have the tools to check moisture levels and make sure the area is truly dry.
Preventing Future Leaks
The right fix is to winterize your system properly before the first freeze. Drain all the water from the pipes, open every drain valve, and use an air compressor to blow out any remaining moisture. Insulate above-ground pipes and valves with foam covers, and consider installing a pressure vacuum breaker that drains itself automatically.
Check your system every fall for worn seals, loose fittings, or signs of corrosion. If you have a backflow preventer, make sure it is drained too, because it can trap water even when the main line is empty. A little maintenance now can save you from a big leak later, but if damage does happen, address it quickly to keep water from ruining your home.
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Call Now (469) 698-4610Frequently asked questions
Can I fix a cracked sprinkler pipe myself?
Yes, if the crack is in an accessible section of pipe and you have basic plumbing skills. Cut out the damaged part, replace it with a new piece, and use the proper fittings. For underground or wall-mounted pipes, you may need professional help to locate and repair the break without causing more damage.
Why does my sprinkler leak only after it thaws?
Ice expands when it freezes, cracking the pipe or splitting a seal. While the ice is still solid, it can plug the crack. Once temperatures rise and the ice melts, water flows through the new gap and leaks out. This is why you might not notice a problem until a warm day follows a freeze.
How do I drain my sprinkler system for winter?
Turn off the water supply, open all drain valves, and let the water run out. Then use an air compressor to blow out any remaining water from the lines. Also drain the backflow preventer and any low points. If you are unsure, a plumber or local pro can show you the process for your specific system.