Septic Inspection Checklist (What We Check)
If you’re scheduling a septic inspection (routine maintenance or for a home sale), it helps to know exactly what the inspection includes. A proper septic inspection isn’t just “looking at the tank” — it’s checking the system components that affect performance, safety, and long-term reliability.
Below is a homeowner-friendly septic inspection checklist that covers what we typically check and what you should do to prepare so the inspection goes smoothly.
What is a septic inspection?
A septic inspection is a documented evaluation of your septic system’s condition and operation. The goal is to identify issues early (before they turn into backups or drain field damage), confirm components are working, and recommend any maintenance needed.
Depending on your system type, an inspection may include the septic tank, effluent filter, pump chamber, alarms/controls, and visible drain field conditions.
Septic inspection checklist (what we check)
1) System access + component locating
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Confirm tank location, lids/risers, and access
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Verify drain field area location (as visible/known)
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Identify system type (gravity vs pump/pressure)
Why it matters: If components are buried or unknown, it can slow the inspection and limit what can be verified.
2) Septic tank condition (as accessible)
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Visual condition of the tank and lids/risers
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Inlet and outlet baffles/tees (if accessible)
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Liquid level (to check for abnormal high levels)
Why it matters: Damaged baffles or abnormal liquid level can point to restricted flow, clogs, or drain field stress.
3) Sludge/scum levels (to determine pumping needs)
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Measure solids levels to see if you’re due for pumping
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Evaluate whether the tank is close to capacity
Why it matters: Overdue pumping is one of the most common causes of backups and drain field problems.
4) Effluent filter check (if present)
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Remove/filter check
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Evaluate clogging and flow restriction
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Clean or recommend service if needed
Why it matters: A clogged filter can cause slow drains, gurgling, alarms (on pump systems), and backups.
5) Pump chamber + pump function (if applicable)
If you have a pump/pressure system:
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Pump operation (basic function)
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Float switches
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High-water alarm condition
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Signs of prolonged high water
Why it matters: Alarms and pump failures are a major cause of sudden septic issues. Catching early symptoms helps prevent emergency backups.
6) Distribution / lines (as applicable)
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Check for visible signs of line issues
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Recommend camera inspection if symptoms point to a blockage or root intrusion
Why it matters: Sometimes the issue isn’t the tank — it’s a restriction or damaged line between the house, tank, or drain field.
7) Drain field area observations
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Soggy ground or standing water
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Sewage odors outside
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Extra-green strips of grass over the drain field
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Signs that problems worsen after heavy rain
Why it matters: The drain field is where wastewater is treated by the soil. Saturation or failure signs need attention early.
8) Owner education + maintenance recommendations
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Pumping schedule recommendations (based on observed solids/usage)
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“What not to flush” reminders
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Water-use best practices (especially during heavy rain in the PNW)
Why it matters: Simple habits can extend the life of the system and reduce emergencies.
How to prepare for a septic inspection
To make your inspection faster and more accurate:
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Clear access to the suspected tank area
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Keep pets secured
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Provide any past service records (pumping receipts, repairs, as-builts)
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Avoid running multiple high-water appliances at once unless requested
If you’re not sure where your tank is, don’t worry — that’s common. A septic company can help with locating and guidance using county records where available.
When to schedule an inspection
A septic inspection is smart when:
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You’re buying or selling a home
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You’re overdue for pumping or unsure of history
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You have slow drains, gurgling, odors, or alarm issues
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You want a baseline check to prevent surprises
Need a septic inspection?
If you’re in Snohomish County, King County, or Camano Island, we can help with septic inspections (including real estate/escrow), pumping, repairs, and drain field issues.
A Wesco Septic, Inc.
Phone: (360) 668-6561
Email: info@awescoseptic.com
