When buying a home in illinois, is the seller or buyer supposed to pay for survey and private well water test?

That sounds like the buyer to me.

When buying a home in illinois, is the seller or buyer supposed to pay for survey and private well water test?
TYPICALLY the costs of any inspections related to purchasing a property belong to the Buyer. But as with everything in real estate, it's always negotiable; just make sure it's in writing. For specific customs in Illinois, I would call a real estate office in your area. They can let you know who USUALLY bears these costs.
Reply:Depends on the contract you signed. That spells it out. In Illinois, normally the seller pays for the survey and the buyer pays for the well water test, UNLESS the contract states something different. READ your contract. TALK to your attorney. Costs can be apportioned between buyer and seller by the contract, regardless of what is usually the case.
Reply:That is something you have to negotiate at the time of the escrow deposit and signing of the contract.