LP excavates for conventional gravity systems, mound systems, pressure dosing systems, and drip dispersal systems — all of which are installed in Kootenai, Bonner, and Benewah Counties depending on site conditions. The specific system required for your property is determined by a licensed soil evaluator's perc test and approved by the Panhandle Health District or Kootenai County Environmental Health. LP does not select the system — we excavate to the approved permit drawings.

Septic excavation costs depend heavily on system type and site conditions. Conventional gravity system excavation typically runs $3,500–$6,000. Mound systems require more material handling and typically run $5,500–$10,000 for excavation and mound construction. Pressure dosing and drip systems vary. LP provides itemized written estimates after reviewing your perc test results and permit drawings.

A percolation (perc) test is a soil evaluation required by the Panhandle Health District before any septic system permit is issued. A licensed evaluator digs test pits, evaluates soil horizons and absorption rates, and determines the appropriate system type for your site. LP does not conduct perc tests — we coordinate our excavation around the evaluator's results and the permit that follows. You should have a current perc test and system design before calling us for a septic excavation estimate.

LP communicates directly with your licensed septic system installer to sequence excavation and installation without conflict. We open the site to the installer's specifications, stand by during installation when our equipment may be needed for adjustments, and return for backfill and compaction after inspection sign-off. We've worked with most licensed installers operating in Kootenai and Bonner Counties.

Mound systems are required when soil absorption capacity is too limited for a conventional drain field — which is common in the clay-heavy valley bottoms of the Rathdrum Prairie and in areas with a seasonal high water table. The mound system places the drain field above the natural soil surface in imported fill material, allowing proper effluent treatment before it reaches the native soil. LP has extensive experience building mound bases and importing the engineered fill media required by the permit.

Gravity systems rely on natural flow from the tank to the drain field. Pressure dosing systems use a pump to distribute effluent in timed doses, allowing for smaller drain fields in challenging soils. LP excavates for both, following the permit specifications.

Excavation duration depends on system complexity. Conventional systems take 1-2 days. Mound systems require additional time for material import and shaping, typically 2-3 days. LP coordinates with your installer to minimize downtime.