Champaign sits in a county with 39.72 inches of precipitation a year, and May is the wettest month at 4.55 inches, according to the Illinois State Climatologist. Spring is when wet basements and damp walls are most likely to prompt a call. The area also has a record of severe storms: in 1996 a strong tornado ran from the north edge of Savoy to the southeast edge of Urbana, destroyed 30 homes and damaged 29 more, which shows how quickly roofs and walls can be opened to rain. When you hire for drying out or mould removal here, ask what the work covers and how the water source will be fixed. The Illinois Department of Public Health says that if you can see or smell mould, testing is usually not necessary, so be cautious about paying for testing you may not need. Ask for a written scope that covers drying, removal and repair. Also check your policy first, since flood insurance is typically a separate policy and not part of a standard homeowners or renters policy.
Source: Illinois State Climatologist (Illinois State Water Survey) (source, opens in a new tab)