Before buying a house with a septic system, get an independent septic inspection separate from the general home inspection, pull the property’s recorded permit history and as-built drawing if one exists, and confirm the system was sized for at least the current bedroom count. A general home inspector typically does not evaluate a septic system in the depth a dedicated septic inspector does.
A dedicated septic inspection opens the tank, checks structural and baffle condition, and looks for signs of drainfield distress, none of which a standard whole-house inspection reliably covers. Given how much more a septic replacement costs than most other single home-repair items, treating it as a line item on a general inspection checklist rather than its own dedicated inspection is a common and costly mistake.
The recorded permit history tells you what was actually approved and when, which matters because an undocumented addition or repair can mean the system in the ground does not match what the county has on file, or was never brought up to current code. Bedroom count matters specifically because system sizing is based on it, and a house that has added bedrooms since the septic system was last permitted may be running beyond its design capacity.
Where records exist, they are the fastest way to check all of this before spending money on a full independent inspection, and are worth pulling first.
We hold recorded septic as-built drawings and parcel-level septic-versus-sewer classification for thousands of US counties. Look up where records are kept for a specific county, or open the interactive parcel map to check a property directly.
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Usually not. A dedicated septic inspection opens the tank and checks conditions a standard whole-house inspection typically doesn't cover in the same depth.
Septic systems are sized from bedroom count, so a house that added bedrooms since the system was last permitted may be running beyond its design capacity, which is worth confirming before buying.
Guide last reviewed 2026-08-31.