Utility & Septic Excavation Services in Spokane, WA
Proper underground installation starts with accurate excavation. Avey Excavation provides residential utility trenching and septic system excavation throughout Spokane, Spokane Valley, Liberty Lake, and surrounding Inland Northwest communities.
From new home builds to system replacements, we excavate with precise depth control, proper slope, and compliance with Spokane County inspection standards.
Residential Utility Trenching Services
Underground utilities require careful planning and accurate trench dimensions to prevent long-term system failure.
We provide:
• Water service line trenching
• Sewer line excavation
• Underground electrical conduit trenching
• Irrigation line trenching
• Utility replacements and upgrades
All trenching is completed to required depth specifications and coordinated with inspection timelines.
Utility trenching is often completed during early site development. Learn more about our site preparation and foundation excavation services to understand how excavation phases are coordinated.
Why Precision Matters in Underground Excavation
Utility and septic systems depend on:
• Proper trench slope
• Correct depth below frost line
• Stable bedding and backfill
• Accurate compaction
Eastern Washington’s freeze-thaw cycles and soil variation make proper installation critical for long-term reliability.
Septic System Excavation
Septic excavation requires exact elevation control and soil awareness. Improper excavation can lead to drainage failure and system malfunction.
Our septic excavation services include:
• Septic tank excavation
• Drain field excavation
• System expansion preparation
• Replacement system excavation
• Coordination with installers and inspectors
We understand Spokane County septic requirements and prepare sites accordingly.
Our Utility Excavation Process
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We review layout plans, utility routes, and inspection requirements.
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Trenches are excavated to proper depth and slope using modern equipment.
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We coordinate with plumbers, electricians, and septic installers as needed.
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After inspection approval, trenches are backfilled and compacted to prevent settlement.
Request a Utility Excavation Estimate
If you're planning a new build or replacing underground utilities, contact Avey Excavation to schedule a site evaluation.