You are right, YOU DO NOT WANT WATER IN YOUR CRAWLSPACE! This can lead to the development of molds and mildews whose spores will penetrate into the home. You will then have really nasty health problems to deal with. In addition, NEVER EVER store ANYTHING in your crawlspace.
You don't really provide a lot of information here, but I will give you some generic suggestions: 1. All grades around the exterior of the home must slope AWAY from the home. No cute garden mounds or anything. Absolutely no soil or patios around the home should be directing water TOWARDS the home. 2. There should be a MINIMUM 4" between the grade and the bottom of your siding. 3. I hope you have a concrete footing and foundation around 100% of the perimeter of your home. 4. Your gutters should drain to a perimeter drain at your foundation footing, which ties into the storm sewer. At the very least, the downspouts should be directed into splash blocks which direct water AWAY from the foundation. 5. Your crawlspace could be above the local water table. If this is the case, you can determine the flow of water by digging some trenches in the yard. Install a curtain drain around the water side of your yard and connect to the local storm drain (this is expensive) 6. Is your water bill high? I saw an electrician drive their grounding rod right through the center of a water supply line. Determine that your water line is not leaking by turning off every water device in the home and looking at the meter. The dial should not move at all. If it is spinning, you could have a leak. 7. Make certain your sewer connections are okay. 8. Your crawlspace should have a positive drain location at the lowest point in the crawlspace. this is sometimes marked on the foundation wall in flourescent paint. Make sure this is free of obstructions and draining properly. 9. Make certain there is adequate ventilation in the crawlspace. Sometimes, insulation will fall out of the floor joists and block the vent screens. Venitilation helps keep the crawlspace dry and reduces pest and rot issues. If your home is less than a year old, the builder should honor a warranty and address these issues.