A plumbing emergency, in practical terms, is anything sending water somewhere it should never reach, or cutting it off completely. Spraying from a split line behind drywall. A supply hose letting go under a washing machine. Waste rising up through the lowest drain in the house instead of draining away from it. A tank of hot water emptying itself onto a garage floor. Or simply turning on a tap and getting nothing at all. A gas odor near an appliance belongs on this list for a different reason entirely: leave the house first, skip the light switches, and call once you’re standing outside.
A faucet that’s been dripping since spring, or a drain running a little slower every week, sits in a calmer category: worth fixing, not worth a middle-of-the-night dispatch. Not sure which side of that line your problem falls on? Say plainly what’s happening when you call, and expect a straight answer about whether it matters tonight or can hold until a normal hour.