Why is it important to review as-built drawings or permit records during the inspection?

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Verifying that the installed system matches the approved design is essential. As-built drawings and permit records show the exact layout, component sizes, and how the system was approved to be constructed. By reviewing them, you confirm tank locations, trench or absorption area size, pipe routes, and other details against what’s actually in the ground. This ensures the installation complies with the approved design, meets required setbacks and loadings, and is appropriate for the site conditions. It also helps identify any post-permit changes or unpermitted alterations that could affect performance or code compliance.

Other aspects like tax values, fencing, or paint color don’t impact septic system function or regulatory requirements, so they aren’t the focus of this review.