Septic Inspection in Ann Arbor, MI

Washtenaw County · 13 providers · Avg. $300 - $600

About Septic Inspection in Ann Arbor

A septic inspection is a thorough evaluation of your entire septic system — tank, distribution box, drain field, and all connecting pipes. There are two types: a visual inspection (basic check of flow and obvious problems) and a full inspection (pumping the tank, measuring sludge layers, checking baffles, probing the drain field, and testing mechanical components). Full inspections are typically required when selling a home, and many mortgage lenders will not approve financing without one. During a real estate inspection, the technician will locate all system components, verify the tank size matches the home's bedroom count, check for evidence of past failures or unpermitted repairs, and provide a written report with photos. Even outside of real estate transactions, periodic inspections (every 1-3 years) can catch small problems before they become expensive emergencies. The inspection report becomes a valuable record of your system's condition and maintenance history. Most states require inspectors to hold specific licenses or certifications, so always verify credentials before hiring.

What Ann Arbor Homeowners Should Know

Local Soil Conditions: Washtenaw County soils are glacial-origin Alfisols and Mollisols — Miami loam, Conover loam, and Brookston silty clay loam as dominant series across residential landscapes. Miami loam is a well-drained Alfisol with an argillic Bt horizon at 6-18 inches, clay content 25-35%, and moderate permeability in undisturbed profiles. Conover loam is the somewhat poorly drained equivalent of Miami — the same glacial till origin but with seasonal water tables at 18-30 inches. Brookston silty clay loam is poorly drained with seasonal water table at 0-12 inches. The Huron River valley and its tributaries carry Shoals and Ceresco loams — seasonally flooded Entisols. Lacustrine clay deposits in low-lying areas near former glacial lake basins have very slow permeability.

Water Table: Miami loam uplands maintain water tables at 36-60 inches. Conover soils have seasonal highs at 18-30 inches. Brookston soils are saturated at 0-12 inches for significant portions of the year. Washtenaw County's variable glacial landscape creates sharp local transitions in water table depth.

Climate Impact: Ann Arbor has a humid continental climate with cold winters (average January high 32°F), hot humid summers, and 36 inches of annual precipitation including significant snowfall (45-55 inches annually). The Great Lakes influence moderates temperature extremes. Spring snowmelt combined with frozen subsoil creates seasonal saturation events that can stress septic drain fields in lower landscape positions. Summer thunderstorms are intense but shorter in duration than southeastern US counterparts.

Signs You Need Septic Inspection

Buying or selling a home with a septic system
Refinancing a mortgage on a septic-served property
Obtaining a building permit for an addition or renovation
System has not been inspected in more than 3 years
Concerns about system age, condition, or past issues

The Septic Inspection Process

1 Locate all system components using available records or electronic locating equipment
2 Pump the tank and measure sludge and scum layer depths
3 Inspect tank interior, baffles, tees, inlet and outlet pipes
4 Check the distribution box for level flow to all drain field lines
5 Probe the drain field for signs of saturation or failure
6 Prepare a detailed written report with findings, photos, and recommendations