Signs of a Hidden Water Leak

Why This Matters

A slow leak behind a wall can go undetected for months, causing structural damage and mold.

Key Signs to Watch For

• High water bill: Sudden increase with no change in usage.
• Sound of running water: Hear water when nothing is on.
• Warm spots on floors: Hot water line leak under slab.
• Mold or mildew: Unexplained mold points to hidden leak.
• Low water pressure: Leak reduces pressure throughout.

What You Should Do

1. Check water meter — Turn off all water, see if meter moves.

2. Use food coloring in toilet tanks — If color appears in bowl, flapper is leaking.

3. Inspect under sinks — Check for moisture, warping, musty smells.

When to Call a Professional

A plumber can use acoustic detectors, thermal cameras, and pressure tests to locate hidden leaks without tearing into walls.

The Bottom Line

Staying ahead of plumbing maintenance saves money and prevents emergencies. Search our directory for a trusted plumbing professional.