Selling a house on septic: start with the job that can't be rushed

Most acreage sellers around Pocatello have lived with their system long enough to stop thinking about it. The tank behind the shop in Tyhee, the field out past the garden in Chubbuck or McCammon, has worked every day for years. Then the listing agent asks when it was last pumped, and nobody in the house remembers. That question is where the sale starts, whether the sign is in the yard yet or not.

Should a seller deal with the septic before the listing or after the offer?

Before. A seller who orders a septic inspection ahead of the listing picks the date, picks the crew and reads the findings with time to act on them. Wait for the offer and the buyer’s contingency period sets the schedule instead, with every day of it counting against you. The tank gets opened and the report gets written either way, only on someone else’s calendar.

There is a second reason. A defect you find in March is a repair you can price, bid and finish on your own terms. The same defect found by someone else in the middle of escrow arrives with a deadline attached.

How far ahead does the septic work have to start?

Earlier than anything else on the prep list, because every step waits on the one before it. In order:

1. The records request. The permit file tells an inspector where the tank and field are and what size the system is. Asking for it costs nothing, but the reply comes back when it comes back, and older places sometimes have almost nothing on file. Our guide to finding your septic tank covers what the file holds.
2. Getting a truck on the calendar. Pump crews book up in the spring and again before winter, and in late fall the ground starts closing (the order it goes in is in our frozen septic guide). This is the step sellers underestimate most.
3. The pump-out itself. It is a single visit, and it has to happen before anyone can see the walls, baffles and outlet. A pre-listing septic tank cleaning also leaves you with a dated receipt, which matters later.
4. Any repair the open tank turns up. A cracked lid or a broken baffle is usually a modest fix, but it is a second trip, and a part may need ordering. This is the step that slips without anyone doing anything wrong.
5. The written report. It should be dated after the repair, so it describes the system the buyer is actually getting.

If step four comes up empty, the whole sequence finishes quickly. Plan as though it won’t.

Who pays for a septic inspection when a house sells?

Either side can, and it is negotiable like anything else in the contract. In practice sales tend to take one of two shapes. The seller orders a report before listing and hands it over with the disclosures, or the buyer orders an inspection during the contingency period, on the buyer’s schedule and with the buyer’s inspector.

Around Pocatello the published ranges put a home-sale inspection at $150 to $300, and an inspection done with the pump-out on the same trip at $375 to $600. The full list of what septic work costs here has the other lines. A buyer may still order an inspection of their own after reading yours. That is fine. A second report that agrees with the first is the quickest way to close the question.

What changes when the buyer’s inspector finds it first?

The repair costs the same, but the buyer gets to name the price and the moment. A seller who finds a failing baffle gets a repair bid and a receipt. A buyer who finds the same baffle gets to guess what it might cost, and that guess tends to run high, because the buyer is paying for uncertainty as well as the part. The buyer also chooses when to raise it, and it is usually late.

Our guide to buying a home on septic in Idaho is the other side of this table. It is worth reading as a seller for one reason: it shows what the person across from you has been told to ask for.

Can you sell a house in Idaho with a failing septic system?

Yes, people do. A failing system does not stop a sale by itself. It turns into a disclosure question and a price question, and the buyer decides whether the number still works.

The party that often decides in practice is the buyer’s lender. On a financed sale the lender may require evidence that the system works, or a repair first, and that requirement sits outside anything the seller and buyer agree between themselves. A cash buyer has more room. If you already know the field is failing, talk to your agent about which kind of buyer you are listing for before the photos go up.

What if the system is thirty years old?

Age alone does not fail an inspection. A report records what the system looks like on the day it is opened: sludge depth, baffle condition, whether the field is taking water without surfacing. It cannot tell a buyer the year the field will quit, and an honest inspector won’t pretend to.

What an older system needs is context next to the report. The install year, the pump-out history and the size of the household it has served let a buyer judge the remaining life for themselves. For how long each part of a system usually lasts in this valley’s soils, see how long a septic system lasts. A thirty-year-old field that measures well and has a clean pumping record is an easier sale than a ten-year-old one with no paperwork.

What belongs in the seller’s folder on listing day?

Short list. Keep paper copies with the disclosures and a scan your agent can send.

• Whatever the permit file had, even if it is one page
• The pump-out receipt with the date and gallons pumped
• Receipts for any repair made after the tank was opened
• The written inspection report with its photos
• A note of the year the next pump-out is due

A buyer touring acreage in Inkom or out toward Arimo already assumes the septic system is a question mark. A folder that answers it before they ask tends to keep the conversation on the house.