Slab Leaks: The Arizona Homeowner's Quiet Emergency

Almost every Casa Grande home sits on a concrete slab with water lines running beneath or through it. When one of those pressurized lines fails, there's no drip to see — just a leak running 24/7 under your floors until something tells on it.

The warning signs, in rough order of how people find out

• The water bill jumps with no change in habits — often the first and only early clue.
• A warm spot on the floor — hot-line leaks radiate heat through the slab; pets sprawling on one spot of tile are a real tell.
• The sound of running water with every fixture off.
• Flooring changes: buckled planks, loose or cracked tiles, darkened grout lines, damp carpet edges along walls.
• Low water pressure, a constantly running water heater, or hairline cracks appearing in walls near floor level.

The five-minute meter test

1. Turn off every fixture and appliance that uses water — including ice makers and the swamp cooler line.
2. Find your meter (curbside box) and watch the low-flow indicator — the small spinning triangle or dial.
3. If it's moving with everything off, water is going somewhere. Now close the house main: if the indicator stops, the leak is inside the house envelope (possibly under the slab); if it keeps moving, the leak is in the yard line between meter and house.

Detection and repair — what the pros do

Leak-detection specialists locate under-slab leaks non-destructively with acoustic listening, pressure isolation, and line tracing — so the repair opens one spot, not a trench hunt. Repair options, roughly in cost order:

• Spot repair: open the slab at the leak and fix that section. Cheapest per incident; on a corroding line, often not the last incident.
• Reroute: abandon the failed under-slab run and route a new line through walls or attic. The standard fix on recurring lines — no slab cutting.
• Repipe: replace the aging system, typically overhead. The expensive-but-final answer for homes whose original lines are failing serially.

The damage side — and insurance

By discovery, slab leaks have often been running for weeks: moisture wicking through the slab into flooring, baseboards, and wall bottoms. That's a restoration scope on top of the plumbing one — drying the slab and assemblies properly before new flooring goes down (the process). On insurance: policies commonly cover the resulting water damage, while pipe repair and slab access vary by policy — and "it leaked for months" invites the gradual-damage exclusion. One more reason the meter test is worth running the day the bill looks weird (claim guide).