Scenario 1The bill names the research starting point
When the current bill identifies Indiana American Water or local regional provider, use that exact system to locate the newest report. Compare the source description—Regional public supply—with the report before carrying any value into a treatment decision.
Scenario 4The building has its own plumbing history
Even when the public-system report is correct, service lines, premise plumbing, water heaters and vacant-building conditions can create address-level questions. Separate system compliance from what a sample at the building can establish.
Scenario 3The property uses a private well or the source is unknown
Do not borrow the public-system contaminant table for a private well. Document the well, treatment equipment, service history and plumbing, then use a certified laboratory panel selected for the actual source and concern.
Scenario 2The ZIP code and supplier do not line up neatly
An address using ZIP 47150 may still sit near a utility boundary, purchased-water zone or private-well area. The postal code organizes mail; it does not prove that Indiana American Water or local regional provider supplies the property.
Local research context: The regional context is Louisville Metro and Southern Indiana, while the city inventory places New Albany in Floyd County. Neither label substitutes for the supplier name on the bill.
Current city note: The Louisville area's Ohio River context does not automatically describe every Southern Indiana tap.