How do you spot hidden water leaks before they get worse?

Funny you mention the musty smell—that’s usually the first sign I notice, too. People get caught up in gadgets, but honestly, your nose and a flashlight go a long way. I’ve seen leaks that sensors totally missed just because the water never pooled; it just soaked into the wood or drywall. I do wish there was a sensor that could pick up on humidity changes inside walls, but most of those are either super pricey or not reliable.

Curious if anyone’s tried using one of those cheap thermal cameras for this? I’ve used them for electrical stuff, but I’m not sure how well they’d pick up a slow leak in a cabinet or under a sink. Sometimes I think just running your hand along the baseboards or checking for soft spots is more effective than anything high-tech. Anyone had luck with those infrared gadgets, or are they more hype than help?

I’ve used them for electrical stuff, but I’m not sure how well they’d pick up a slow leak in a cabinet or under a sink. Sometimes I think just running your hand along the baseboards or checki...

I totally get what you mean about the musty smell being the first clue. I’ve had the same experience—sometimes it’s the only warning before things get ugly. About thermal cameras, I’ve tried one of those budget models (the kind that clips onto your phone). It did help me spot a cold patch behind drywall where a pipe was sweating, but honestly, it’s hit or miss. If the leak is tiny or slow, the temp difference isn’t always enough to show up. Like you said, running your hand along baseboards or looking for soft spots is still super effective. The gadgets are cool, but they’re not magic.

Honestly, I think you nailed it with this:

The gadgets are cool, but they’re not magic.

What’s worked best for me is just being nosy—pulling out drawers, poking around under the sink every month or so. If you catch even a hint of that musty smell, don’t ignore it. I once found a leak just because my dog kept sniffing the same corner of the kitchen... turned out there was a slow drip behind the baseboard. Sometimes old-school curiosity beats fancy tech.

I get where you’re coming from—nothing beats just poking around and using your nose sometimes. That said, I wouldn’t write off thermal cameras entirely. They’re not perfect, but in older homes with tricky pipe runs or finished basements, they can spot things you’d never see otherwise. I’ve caught leaks behind tiled walls that would’ve gone unnoticed for months. Sure, it’s not always crystal clear, but paired with a moisture meter, it can save a lot of demo work. Sometimes a little tech does help, especially when you’re stumped.

I get the appeal of tech—honestly, I do—but sometimes I worry people lean on gadgets a little too much and forget about the basics. That said, I’ll admit, thermal cams can be a lifesaver in certain situations. Last winter, we had a slow leak in our laundry room wall that wasn’t showing any real signs yet—no musty smell, no visible damp spots. I’m pretty cautious about water issues (mold is my worst nightmare), so I borrowed a friend’s thermal camera just to be sure. Turns out, there was a weird cold patch right where the pipe runs. Would’ve never found it by poking around or sniffing.

Still, I’d argue you can’t beat regular checks and paying attention to your utility bills. We caught another leak once just because our water usage spiked for no reason. Turns out, the outdoor hose bib had a tiny drip under the deck. No fancy tools, just old-fashioned paranoia and keeping an eye on things.

I guess my take is: use whatever works, but don’t let gadgets give you a false sense of security. Sometimes they’ll miss stuff or give you false positives, and you end up tearing open a wall for nothing. Pairing tech with common sense seems like the safest route—especially if you’re like me and want to avoid unnecessary repairs (and waste). The less demo, the better for everyone... and the planet.