Septic System Inspections: What Buyers Should Know
By David Parks · eXp Realty · The Apollo Group · 2 min read
The Short Answer
A septic system treats household wastewater on the property instead of sending it to a city sewer. A dedicated septic inspection checks the tank, the drain field, and how the system performs under normal use.
Illustration by David Parks
How a septic system works
Wastewater flows into a buried tank where solids settle and liquids move to a drain field, also called a leach field, where soil treats the water. Septic systems are more common in rural areas and mountain communities.
What a septic inspection includes
Locating and opening the tank to check levels, baffles, and condition.
Looking at the drain field for soggy ground, odors, or lush patches.
Reviewing pumping and repair history.
Sometimes a hydraulic load test, which runs water through the system to see how it handles flow.
Quick Poll
Have you ever dealt with a septic system problem?
You are not alone. Get the findings in writing from a licensed professional, keep photos and receipts, and if you are buying, use the report as a negotiation point before your inspection deadline. Talk with David if you want a second opinion on what matters.
Good news, but this is exactly the kind of issue that can stay hidden until someone looks. Add it to your inspection checklist or ask your inspector about it before you buy or sell.
That is very common. The simplest way to know is to have it checked. Ask David which inspections are worth adding for the home you are considering. Talk with David.
Things to ask
Ask when the tank was last pumped, the tank size, number of bedrooms the system was permitted for, and whether permits are on file with the local health department. Systems that serve more people than designed can fail.
Cost and care
Pumping every few years is common, and drain fields can be costly to replace, so inspect before you buy. Avoid pouring grease or harsh chemicals down drains and keep heavy vehicles off the drain field.
Key Takeaways
How a septic system works: Wastewater flows into a buried tank where solids settle and liquids move to a drain field, also called a leach field, where soil treats the water.
What a septic inspection includes: Locating and opening the tank to check levels, baffles, and condition.
Things to ask: Ask when the tank was last pumped, the tank size, number of bedrooms the system was permitted for, and whether permits are on file with the local health department.
Cost and care: Pumping every few years is common, and drain fields can be costly to replace, so inspect before you buy.
This article is general information, not legal, tax, financial or inspection advice. Every home and situation is different, so confirm details with a licensed inspector, lender, attorney or tax professional.
David is a Greater Denver real estate advisor with eXp Realty and The Apollo Group (Colorado broker license FA100103211). He has closed more than $55 million in volume, earned eXp Icon status in 2025, and holds a 5.0 rating on Zillow from 27 verified reviews.
