A buyer needs to know what wastewater system serves the parcel, where it lies, whether its approved design matches the house, how it has been maintained, and what condition can be observed. Central District Health’s mortgage survey is a specific agency service and should not be confused with a private tank-and-field inspection.
Begin with four separate documents
Retrieve the CDH permit and as-built drawing, the seller’s pump and repair receipts, the purchase contract’s inspection terms, and the lender’s written requirements. Each answers a different question. A clean pump receipt does not show that a field is properly sited; a permit drawing does not show today’s baffle condition.
Older records may be indexed by legal description, and a missing result can reflect a database gap. Ask whether additions changed the bedroom count or water use. Compare patios, shops, drives, and landscaping with the reserved replacement area shown on the file.
CDH offers a mortgage survey
CDH says lenders often request mortgage surveys for a sale or refinance. As of July 2026, a septic-only survey costs $178. The application identifies the parcel and lets the applicant select well, septic, or combined scope.
That agency service does not automatically satisfy every lender or purchase contract. Confirm timing, report format, water sampling, pump requirements, and who may perform each task before the inspection deadline. Avoid ordering overlapping reports that answer the same narrow question.
A contractor condition inspection looks at operation
The private inspection can locate accessible components, record tank level, measure layers, inspect baffles and filters, note visible damage, observe pumps and alarms within scope, and walk the field for surfacing or disturbance. Pumping can add an empty-tank view when required.
Ask the report to separate observed defects from recommendations and limitations. Buried components, snow, landscaping, unsafe covers, electrical scope, and lack of water flow can limit what was tested. Photographs and measured depths carry more value than a pass/fail label.
Protect the inspection period
Do not schedule the pump before the inspector can observe the operating level unless the agreed protocol requires it. Confirm that lids can be opened and that the seller authorizes access. Ask for prior service records early; mountain-route scheduling can consume several days without promising an exact response time.
If the field is saturated or wastewater is surfacing, reduce use and involve the health district. A seller-funded pump-out does not settle the cost or feasibility of a permitted repair. Keep those negotiations tied to written findings and agency requirements.
When a transaction inspection may be unnecessary
A connected sewer property does not need a septic inspection merely because an old tank once existed. Verify utility billing and abandonment records. New construction with a finalized permit may still deserve record review, but the buyer can decide whether an additional private scope adds enough information.
Call (208) 297-2198 with the address, lender instructions, contract deadline, known system type, last pump date, and requested deliverables. We can route the service conversation without claiming a statewide sale mandate.