Septic System Site Prep
The system only works
if it's dug to spec.
A septic system is engineered to exact dimensions, and the inspector measures every one of them. Tank depth, drain field width, gravel depth, and mound slope all have to match the approved drawings — not approximately, not close enough. A failed inspection means re-excavation, which means re-doing the work you already paid for.
LP has coordinated septic excavations across Post Falls, Hayden, Rathdrum, and Spirit Lake since 2005. We work from your perc test, pull the permits, dig to the drawings, and sequence our work around your licensed installer so the system goes in without a second mobilization.
What a correctly built
septic foundation is worth.
System Longevity
Properly excavated and compacted septic systems function correctly for 20+ years, avoiding the repairs that come from a failed drain field.
Environmental Compliance
Permitted work protects groundwater and meets Panhandle Health District and Kootenai County standards on every project.
Inspection-Ready
Precision excavation passes inspection on the first attempt, keeping your build schedule from stalling on a re-excavation.
One Crew, One Schedule
LP owns its equipment and operators. Your excavation, your septic installer, and your inspection stay on one timeline instead of three.
The right system is the one
your soil test supports.
Conventional Gravity System
The most common system for suitable soils — tank and gravity-fed drain field. LP excavates the tank cavity, drain field trenches, and distribution box area to exact permit specs.
Mound System
Required when perc-test results show limited soil absorption or a high seasonal water table. LP builds the mound sub-base, imports the required fill material, and shapes the mound profile.
Pressure Dosing System
A pumped system that distributes effluent in controlled doses. LP excavates the dose chamber, pump vault, and field laterals, then coordinates with the licensed installer for pressure-testing.
Drip Irrigation Dispersal
Idaho DEQ-approved for certain challenging sites. LP prepares the disposal area, installing filter media beds and drip tubing zones as specified by the system engineer.
Perc Test Coordination
LP works from your licensed soil evaluation to determine which system type your parcel can actually support. The system has to fit the soil — designing around the perc result is what prevents a failed install.
Permit-Exact Dimensions
Tank cavity, distribution box, pump vault, and drain field are excavated to the dimensions on the approved permit drawings. Not close. To the inch — because that is what the inspector measures.
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