Short answer
Plumbing problems range from slow drains to active leaks and water heater failures. Shutting off the local supply valve can limit damage when you know where it is and can reach it safely.
Leaks
Supply-line leaks, fixture seals, and water heater issues are common. Capture photos if safe, note which fixture is involved, and tell us if water is near electrical panels.
Drains
Clogs may be local or deeper in the line. Avoid chemical drain products that can complicate repair. Maxcel can diagnose and clear with the right approach.
Water heaters
No hot water, lukewarm output, or leaking tanks need professional attention. Age and sediment buildup often matter for repair vs replacement discussions.