Ask for dates and paper, not impressions: when was the tank last pumped, when (if ever) was the system last inspected, how old is it, how many bedrooms was it permitted for, has it ever failed or needed repair, and do they have the permit or as-built record. A seller's honest "I don't know" is common and not itself a red flag; what matters is whether you can get the real answer from the record instead.
• When was the tank last pumped, and by whom — a receipt is better than a memory.
• Has the system ever been inspected for a prior sale or refinance, and is that report available?
• How old is the system, and was it installed under a permit (versus built before permitting existed in the area)?
• How many bedrooms was the system designed and permitted for, and does that match the house today?
• Has the system ever backed up, overflowed, or needed a repair, and what was done?
• Do they have the permit, the as-built drawing, or any county correspondence about the system?
Sellers who've owned a property for years often genuinely don't know the tank's exact size or the field's exact layout; it's underground and, when it's working, invisible. That's exactly why the permit record matters more here than in almost any other part of a home sale: it's the one place the system's actual design is written down independent of anyone's memory. See how to find septic records before closing for how to pull that record yourself, even if the seller can't produce it.
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That's common, especially for older systems or long-tenure owners. Pull the county permit record yourself rather than relying on the seller's memory.
Not by itself. Many counties hold the record even when the seller doesn't have a copy. It becomes more of a concern only combined with other signs, like an evasive answer about pumping history or visible yard issues.
Yes, where your state's disclosure form covers it. See our guide on seller disclosure obligations for what's typically required and what isn't.
Reviewed 2026-08-31 against the official sources linked above (where a source is cited) or, where none is cited, left deliberately general. Laws, lender overlays and local ordinances change; confirm current requirements with the county or state agency, your lender, and a licensed inspector before you rely on this for a closing.