I get what you’re saying about the water meter trick—it’s a solid move. But honestly, I’ve had hissing sounds that never showed up as leaks, even after shutting everything off and watching the meter. Sometimes it’s just pipes expanding or air in the lines, especially in older houses. If the noise changes when you flush or run water, I’d lean toward a valve or pressure issue, not a leak. Still, I keep an eye on it just in case... never hurts to be cautious.
If the noise changes when you flush or run water, I’d lean toward a valve or pressure issue, not a leak. Still, I keep an eye on it just in case... never hurts to be cautious.
That’s a good point about the noise changing with water use. I’ve been told the same thing—if the hissing gets louder or softer when you turn taps on and off, it’s probably not a hidden leak. But sometimes I wonder if we’re just missing something small, like a slow drip behind a wall that doesn’t show up on the meter right away. Pipes in old houses can make all kinds of weird sounds, though. Ever had one of those pressure reducing valves start buzzing? That tripped me up once, thought for sure it was a leak until someone showed me how to check the valve.
You’re right to keep an eye on it. I guess the real trick is figuring out when to worry and when to just chalk it up to old plumbing doing its thing...
Pressure reducing valves can be sneaky little troublemakers. I’ve seen them buzz, hum, even rattle the pipes when they’re not set quite right or start to wear out. It’s easy to mistake that for a leak, especially in older homes where every sound echoes through the walls. I always recommend folks check those first—sometimes just a minor adjustment or cleaning can quiet things down.
That said, you’re right about those slow drips being tricky. Not every leak shows up on the meter right away, especially if it’s small or evaporating before it pools anywhere obvious. I usually tell people to look for any new water stains, musty smells, or soft spots in the drywall—those are classic signs something’s going on behind the scenes.
Old plumbing definitely has a personality of its own. Sometimes it’s just noisy for no good reason, but I’d rather be overly cautious than end up with a surprise repair bill. If it keeps you up at night, it’s probably worth a closer look... or at least some earplugs.
I get where you’re coming from about the pressure reducing valves, but honestly, I wouldn’t chalk up every weird sound to “just old pipes” or harmless valve noise. I’ve seen too many cases where folks ignore that hissing, thinking it’s nothing, only to find out weeks later there’s a pinhole leak spraying inside a wall. Even if there aren’t obvious stains or smells yet, I’d push for a moisture meter check or even a quick look behind the access panel if you’ve got one. Better safe than sorry—water damage sneaks up fast, and insurance doesn’t always play nice with “hidden” leaks.
I get the concern about hidden leaks, and I’ve definitely dealt with my share of water damage headaches over the years. Still, I wouldn’t jump to worst-case scenario every time you hear a hiss behind a wall. In older buildings especially, you’ll get all sorts of odd noises—sometimes it’s just the pipes expanding or contracting, or even air in the lines after someone’s flushed or run a tap elsewhere. I’ve had tenants call me in a panic over what turned out to be nothing more than a loose washer in a shutoff valve.
That said, I’m not saying ignore it if something seems off. But before tearing into walls or calling in pros, I usually start with the basics: check for any visible moisture around baseboards, feel for dampness, and see if there’s any drop in water pressure. If everything looks dry and there’s no musty smell, I’ll keep an eye on it for a few days. Sometimes these sounds come and go depending on temperature swings or how much the plumbing is being used.
One thing I’ve learned—if you do suspect a leak but can’t find evidence, try shutting off the main water supply overnight and see if the meter moves. That’s saved me from unnecessary repairs more than once. Moisture meters are handy, but they’re not always accurate through tile or thick drywall.
I guess my point is, don’t ignore weird noises, but don’t assume disaster either. A little patience and some basic checks can save you from ripping open walls for no reason... but yeah, if you start seeing stains or smelling mildew, that’s when it’s time to act fast.