Standing water and ground fungus
Is there clean air going to this room?
Floor rotting due to high moisture
Damage done to floor joist by the Powder Post Beetle
High moisture is a breeding ground for insects, Mold, rot and bacteria
Building material left in a crawl space adds to the air quality problem
High moisture will rust your heat/cooling ducts
Dead rodents are a health hazard
Insulation in the floor joist won't stay long
Floor joist insulation traps moisture and allows Mold to grow