Had the same issue a couple years back—spent way too long convinced it was the disposal or dishwasher, but turned out to be something else entirely. Have you checked the faucet connections themselves? Sometimes those supply lines can drip down along the pipes and make it look like it's coming from somewhere else entirely. Also, is your sink mounted solidly? I've seen cases where a loose sink seal lets water sneak underneath, causing mystery puddles below.
Another thought: have you tried running water into each basin separately and observing closely underneath? Sometimes one side of a double sink has a sneaky leak at the basket strainer or drain flange. And speaking of basket strainers—did you recently replace or tighten yours? Those rubber gaskets can get pinched or twisted pretty easily if you're not careful.
One more thing—are your pipes PVC or metal? If they're metal, corrosion spots can be tiny and tough to spot at first glance. Run your fingers along the pipes carefully (when they're dry!) and feel for any rough patches or tiny drips.
Plumbing gremlins indeed...they're sneaky little devils.
Good points all around, especially about checking those sneaky faucet supply lines. I spent days chasing a phantom leak under my sink once, convinced it was a drain issue. Turned out it was actually the pull-out sprayer hose connection dripping just enough to confuse me. Have you checked that yet? Sometimes those sprayer hoses can loosen up or the O-ring inside can deteriorate, causing slow drips that run down the back of the cabinet and pool at the bottom.
Also, have you recently done any work or moved stuff around under there? I ask because once, after replacing a garbage disposal, I unknowingly knocked the P-trap slightly out of alignment. It didn't leak immediately, but after a few days of running water, I started noticing random puddles. Took me a while to realize what I'd done—felt pretty silly afterward.
Another thought: is your drain line properly ventilated? Sometimes a partial clog or poor ventilation can cause water to back up slightly into places you wouldn't expect, making it seem like there's a leak when really it's a drainage issue. I know it's not the most common scenario, but I've seen it happen a couple times.
And one last thing—do you have a water filter or reverse osmosis system installed under there? Those fittings can be notoriously tricky and leak quietly for weeks before you notice anything. I had a friend who discovered her "leak" was actually from a tiny hairline crack in her RO system line.
Anyway, plumbing gremlins are definitely real...and they love kitchen sinks the most, I swear. Good luck tracking yours down!
I get what you're saying about ventilation, but honestly, in my experience that's pretty rare. Usually it's something simpler like a loose fitting or worn-out seal. Still worth checking, I guess... plumbing issues always seem to defy logic anyway.
Yeah, plumbing can be weirdly unpredictable. Just went through something similar myself—thought it was a major issue, but turned out to be a worn washer on the connection. Took me forever to find it because I kept looking for bigger problems. You're probably right about seals or fittings, honestly. Always seems like the smallest things cause the biggest headaches. Anyway, hang in there, you'll get it sorted eventually... just keep a towel handy in the meantime, haha.
Had something similar happen last month—spent ages tightening fittings, swapping washers, and it ended up being a hairline crack in the pipe itself. Barely noticeable but enough to keep dripping steadily. Plumbing's sneaky like that, always making you chase your tail. Did you check the pipes themselves closely, or mostly just the connections and seals? Sometimes those tiny cracks can hide right in plain sight...
