Here in Maine, spring means thawing snow, which can be especially hard on basements and attics. No one wants leaks in their home, but if you have them, now's the time to take care of them - as soon as possible.
If you have an attic, check it for leaks, especially if it smells musty. Look closely at the underside of the roof and insulation for any discoloration, deterioration or stains that may be evidence of water damage. If you find any hint of water damage or leaking water, call a professional. It may be a quick and easy fix or it may be a symptom of a much larger problem (such as a leaky roof). In either case, a pro will know how to handle any leaks.
When you venture down to the basement, be prepared for a thorough investigation. This is where most of the leaks in a home occur, and unless the floor or walls are wet (or if you see water seeping in), these leaks aren't always apparent. Check the walls, floor and trim for water stains or other signs of seepage or leaking through the foundation. Before you even start, you'll want to look at this helpful guide about wet basements. It will tell you what to look for, some of the causes of wet basements and how to go about fixing any damage.
Take a look around the base of your water heater for evidence of leaks. If you find any, it may be time to replace it. Call a qualified service technician, who can tell you whether it's fixable or if a whole new heater is the way to go.
It's been said that an ounce of prevention is worth a pound of cure. In the case of water leaking into your home, prevention is crucial (even if some damage has already occurred) to prevent major problems - and expensive repairs - later on.