A pipe lets go, and you have about two good minutes. Here is the order in which those first minutes belong, and why the water is not first.

A sulfur smell in the room is not the same as one at the tap. Get the leave-now sequence, then learn to tell four rotten-egg sources apart.

A cable cuts a channel through a clog; pressurized water scours the pipe wall. The difference is what each one leaves behind, and what your pipe can take.

A confirmed leak still has to be pinpointed. See how pressure testing, line locating, acoustics, thermal, and tracer gas narrow it to one spot.

A tub's finish shows how it fails before the shell does. See how acrylic, porcelain, and fiberglass wear differently.

You wipe down the kitchen faucet on a Sunday, and by the following weekend the same white crust is back around the spout. The shower head sprays in a crooked pattern instead of a full fan.

You flush the toilet, or maybe it's just sitting there full, and it suddenly bubbles and gurgles right as the washing machine starts draining down the hall.

Meters and bills don't lie about volume, even when nothing looks wrong on the surface. Learning to read that number, rule out the normal explanations, and narrow down where the extra water is going catches a leak while it's still a minor repair instead of a major one.