The 10 Most Common Plumbing Issues Dripping faucets.Slow draining sink.Clogged bath or shower drain.Clogged toilet.Running toilet.Faulty water heater.Low water pressure.Jammed garbage disposal.Leaky pipes.Sewer system backup. 1. Dripping Faucets Dripping faucets are so common that it's rare to find someone who hasn't experienced this issue. It's not just a source of irritation, the waste of water can push up your water bill and cost you money. A single faucet can drip away hu