Had a call last month—brand new install, fancy hidden drain, and they still ended up with a slow leak that took weeks to notice.
That’s exactly my worry with dedicated lines behind walls. Once you close up the drywall, you’re just hoping nothing goes wrong. I’ve seen pinhole leaks go undetected for months—by then, you’re dealing with mold, warped studs, and a whole lot more than just plumbing. Under-sink setups aren’t perfect, but at least you can spot trouble fast and it’s way easier to swap out a fitting or tighten a clamp. High loop or air gap? 100% agree there—no shortcuts on that part.
I hear you on the hidden leaks—had a friend who didn’t notice a slow drip behind their dishwasher for months. By the time they caught it, the cabinet base was mush and there was a weird smell that just wouldn’t go away. I lean toward under-sink setups too, since you can spot issues before they get out of hand. Out of curiosity, has anyone tried one of those leak sensors under their sink or dishwasher? Wondering if they actually help catch stuff early or just end up being another gadget to babysit...
Leak sensors are actually a pretty solid investment, especially if you’ve ever dealt with the aftermath of a hidden drip. I get the hesitation—another gadget, another battery to change, more notifications... But in practice, they’re pretty low-maintenance. Most of the decent ones just sit under the sink or behind the dishwasher and mind their own business until water hits them. No fuss unless there’s a problem.
Here’s how I usually see it play out:
1. Place the sensor in the lowest spot under your sink or right where water would pool if there’s a leak.
2. Set up the app (if it’s a smart one) or just test it with a damp rag to make sure it beeps.
3. Forget about it until you hear that alarm or get a notification.
I’ve installed them for folks who travel a lot or have rental properties, and they’re always surprised at how unobtrusive they are. One client caught a slow leak from a loose supply line clamp within hours—saved their cabinet and probably a couple grand in repairs.
I’m with you on favoring under-sink hookups for dishwashers too. It’s just easier to keep an eye on things, plus you can spot corrosion or drips before they become disasters. Dedicated drain lines have their place, but unless you’re dealing with a really specific plumbing setup, under-sink is usually more practical for most homes.
If you’re worried about “babysitting” another device, stick to the basic sensors without Wi-Fi. They’ll just beep loudly if there’s trouble—no apps, no updates, nothing extra to manage. Honestly, after seeing what water damage can do (moldy cabinets, warped floors, that weird smell that never leaves), even a cheap sensor feels like cheap insurance.
Hope that helps ease some of the gadget anxiety. Hidden leaks are sneaky... anything that gives you a heads-up before things get soggy is worth considering in my book.
I’ve seen both setups in the wild, and honestly, under-sink hookups just make life easier when something goes sideways. Had a call last year—dedicated drain line, tucked behind a wall, no sensor. By the time anyone noticed the leak, the drywall was mush and the subfloor was toast. With under-sink, at least you can spot trouble before it gets out of hand. I get why some folks want everything hidden, but sometimes “out of sight” just means “out of mind” until it’s too late. Give me access and a cheap sensor any day.
I get why some folks want everything hidden, but sometimes “out of sight” just means “out of mind” until it’s too late. Give me access and a cheap sensor any day.
I totally get where you’re coming from. That line about “out of sight just means out of mind until it’s too late” really hits home. We moved in last year and I was shocked how much can go wrong behind the walls. I went with an under-sink hookup for our dishwasher, partly because I wanted to keep an eye on things and partly because I’m not super handy if something leaks. Plus, adding a cheap water sensor under there gives me some peace of mind. Hidden lines look cleaner, but honestly, I’d rather have access than deal with a surprise repair bill down the road.