A septic as-built drawing is the final record of what was actually installed, submitted to the county when the system is approved: tank location, size, and capacity, the drainfield layout and dimensions, the soil evaluation results, and the setbacks as built. It is different from the original design drawing, which shows what was planned, because installation sometimes shifts slightly from the plan and the as-built captures the real, final result.
This single document is what almost every future interaction with the system depends on: a pumper uses it to locate the tank, a designer uses it as the starting point for any repair or replacement, an inspector uses it to check the system against what was permitted, and a buyer uses it to know what they are actually purchasing.
Because it is filed with the county at the time of approval, the as-built is a public or semi-public record depending on the jurisdiction, obtainable through the county or district health department, sometimes through an online portal and sometimes only by request.
A property without a locatable as-built — because the system predates consistent record-keeping, or the file was lost — is at a real disadvantage for every one of those future interactions, which is part of why pulling and keeping a copy of this drawing matters well beyond the time of installation.
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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The design shows what was planned before installation; the as-built shows what was actually built, which can differ slightly and is the more reliable document once the system is in the ground.
Pumpers to locate the tank, designers doing repairs or replacements, inspectors checking the system, and buyers evaluating a property all rely on it, which is why it is the single most useful document tied to a septic system.
It's filed with the county or district health department at the time of permitting, sometimes available through an online records portal and sometimes only by direct request.
Guide last reviewed 2026-08-31.