Clogs, Leaks, or Neglect.
It pays to be familiar with your plumbing system so you can minimize the damage caused by plumbing problems as well as fix minor problems on your own.
The most important thing you can do is find out where the main water shutoff valve is and how to turn it off. This is usually either outside your home or in your basement or crawlspace. If you can not find it or don’t know how to turn it off, contact your utility company and have them show you. If any tools are necessary to turn off your water, keep them handy.
Being able to shut your water off at the main valve can be vital to reducing damage to your home if a pipe were to burst.
You should also check each plumbing appliance (sinks, toilets, etc.) for their own shutoff valves and verify they work. If the valves fail to turn off water to the appliance, you should have them fixed by a professional plumber.
These valves come in handy when the need arises to repair individual appliances.
If an appliance has no valves, you will need to shut off your water at the main valve to repair it.