What a Slab Leak Actually Is
Your home sits on a concrete slab. Water pipes run underneath it or through it. When one of those pipes cracks or corrodes, water leaks into the dirt and concrete around it. That’s a slab leak.
Hot water line leaks are easier to catch—they create warm spots on your floor. Cold water and sewer leaks are trickier. They drip for months without obvious signs while soaking into everything below.
The EPA estimates that 10% of homes have leaks wasting 90 gallons or more per day. A slab leak? That number climbs much higher. And the water bill is just the start. Left alone, you’re looking at foundation cracks, ruined flooring, and mold in places you can’t see.
Warning Signs You Shouldn’t Ignore
Slab leaks hide under concrete, but they leave clues:
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Warm Spots on Floors
– A hot water line leak heats the concrete above it
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Sound of Running Water
– Hearing water when nothing’s on is a red flag
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Spiking Water Bills
– Sudden increases with no change in habits
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Water Meter Won’t Stop
– Turn everything off and check; if it’s moving, water is escaping
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Damp Carpet or Flooring
– Wet spots with no explanation, especially along walls
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Cracks in Walls or Flooring
– Water saturating soil causes settling and shifting
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Mold or Mildew Smells
– Persistent mustiness traces back to hidden moisture
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Low Water Pressure
– A significant leak reduces pressure throughout the house
