Most homeowners don't panic when they see a small drip under the sink. And that's exactly the problem.

A tiny leak doesn't stay tiny. Left alone for even a few days, it can warp your subfloor, breed mold behind your walls, and turn a $30 fix into a $10,000 insurance claim.

Here are the 5 most common mistakes I see people make:

1. "It's just a drip, I'll deal with it later."

Water damage compounds fast. What looks harmless today can rot structural wood in under a week. The clock starts the moment you see moisture.

2. Reaching for duct tape or super glue.

These aren't plumbing solutions. They fail under pressure, trap moisture underneath, and give you false confidence while the damage spreads behind the patch.

3. Not shutting off the water supply first.

Before you do anything — locate your shutoff valve. If you don't know where it is right now, stop reading and go find it. Seriously. This is the single most important thing in your home to know.

4. Ignoring the water that already escaped.

People fix the leak and forget the puddle. Standing water under a cabinet is a mold factory. Dry everything thoroughly — fans, towels, dehumidifier if you have one.

5. Not knowing when to call a pro.

There's no shame in calling a plumber. If the leak is at a joint you can't reach, involves your main line, or you're not 100% confident — call someone. A $150 service call beats a $10,000 remediation every time.

I wrote a complete guide that walks you through exactly what to do when you find a leak — step by step, no jargon, no panic. It covers assessment, containment, DIY fixes, and when to call for help.

If you own or rent a home, this is the kind of knowledge that pays for itself the first time you need it.