Landlord or tenant responsible for testing water ? (Read Description)

[Jack Steen]

I am the tenant in this scenario. I am finishing up my last semester at Iowa State University. Came back to my apartment after Winter break and noticed some cups I had left with water in them had evaporated and left behind an oily/heavy metal looking residue. Looks pretty sketchy to be honest. I also let some more evaporate recently and noticed the same residue. Anyone have any advice on how to proceed?