Septic Inspection Checklist: What a Thorough Inspection Covers

Whether you're buying a home, selling, or doing routine maintenance, a proper septic inspection is one of the best investments you can make. Here's what it should cover.

Tank Inspection

• Tank condition — cracks, leaks, structural integrity
• Inlet baffle condition (prevents solids from flowing in with force)
• Outlet baffle condition (prevents scum and solids from flowing out)
• Sludge and scum layer depth (to determine pump frequency)
• Effluent filter condition and function (if present)
• Tank access lid condition and accessibility
• Tank size relative to bedroom count and household size

Drain Field Inspection

• Visual inspection for surfacing effluent, wet spots, or odors
• Load test (running significant water use while monitoring system response)
• Distribution box condition (if accessible)
• Root intrusion assessment
• Evidence of past repairs or modifications

Pump System Inspection (if applicable)

• Pump operation — does it activate and move the expected volume
• Float switch function and calibration
• Control panel condition and alarm operation
• Pump chamber level during normal operation

Documentation to Request

• Written inspection report with findings and recommendations
• Photo documentation of tank interior
• System diagram if available
• Any permit or county records associated with the system

Questions to Ask the Inspector

• How does the tank size compare to the home's bedroom count?
• Are there signs of past failures or repairs?
• What is your assessment of remaining system lifespan?
• What maintenance should be done in the next 1–3 years?

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