How to Locate a Septic Tank and Drainfield
Start with official property records and use safe, non-destructive locating methods appropriate to the site.
By The Septic Pro List Editorial Team · Sources listed below · Last updated August 27, 2026
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Look for the approved record first
EPA recommends contacting the local permitting authority, often a health or environmental department, for the property design, as-built drawing, and permits. Deeds, building records, prior service invoices, and seller records may provide additional clues.
Compare records with the site
A building outlet, riser, inspection port, pump-control panel, mound, or protected open area may help a professional relate the plan to current conditions. Landscaping and renovations can obscure components, and a drawing may not precisely reflect later work.
Avoid unsafe probing or excavation
Do not open or enter tanks, damage buried lines, or excavate without utility and component locating. Ask a provider which methods are included, whether access excavation is separate, and how located components will be documented for future care.
Sources: EPA frequent questions; EPA care guidance.
Local requirements matter
This guide provides general information. System designs, service intervals, permits, inspections, and provider requirements vary. Confirm current requirements with the appropriate local authority.