Quick answer: In Clay County, MN, every existing septic system must be inspected and certified by the county before ownership transfers. The seller requests it, and the buyer gets a copy before closing. In Cass County, ND, Fargo Cass Public Health will evaluate an existing system for a sale (the tank is pumped first). It isn't a blanket requirement at every sale, but a cesspool must be removed before the property can be sold. Either way, schedule early. Call (701) 566-7446 to book the pump-out or a pre-listing inspection.
Side by side: the two counties
| Clay County, MN (Moorhead side) | Cass County, ND (Fargo side) | |
|---|---|---|
| Inspection at sale | Required: county certification before transfer of ownership | Available on request: an evaluation by Fargo Cass Public Health to facilitate the sale |
| Who arranges it | The seller | Whoever requests it: often the seller or buyer, as the purchase agreement or lender requires |
| Who inspects | Clay County Environmental Health | Fargo Cass Public Health Environmental Health (for the Southeast Public Health Collaborative) |
| County fee* | $150 compliance inspection | $200 evaluation |
| Pump-out first? | The application asks when the tank was last pumped | Yes. The tank must be pumped by a licensed pumper first |
| Winter sales | Nov 1–Apr 30: request before closing, inspection completed by July 1 | Plan around frozen ground and snow over the lids |
| What you get | Certificate of compliance or notice of noncompliance | A letter of evaluation on the system's condition |
*Fees as listed on each county's current application form at the time of writing (Clay County, 11/2025; Fargo Cass Public Health, 2024). Confirm with the office before you apply. A pump-out is a separate cost, typically $300–$600 in this area (see the septic pumping cost guide).
Selling in Clay County, Minnesota
Clay County's sewage ordinance requires that all existing septic systems be certified by the county before a transfer of ownership, and it puts the job on the seller. Clay County Code 6-1-10 says the seller must give the buyer a copy of the certification inspection, showing whether the system is compliant or noncompliant, before closing. The county's application asks for the realtor's contact information, the house's bedroom count and water-using appliances, when the tank was last pumped, and whether there have been backups, overflows, or wet spots over the drain field in the past two years. Have those answers ready and the paperwork goes faster.
If the system doesn't pass, the county says the cost of bringing it up to code is negotiated between buyer and seller. It doesn't automatically fall on either side. That's why getting the inspection done before you list, or at least before you accept an offer, gives the seller room to plan.
Winter closings: between November 1 and April 30, the seller must submit the inspection request to Clay County before closing, and the inspection has to be completed by July 1. That lets a sale close over frozen ground, but someone still has to deal with whatever the spring inspection finds. Put it in writing: who pays for repairs, and whether money is held in escrow.
Minnesota rules that apply on top of the county's
- Written disclosure: Minnesota law requires a seller to disclose in writing how the property's sewage is handled. If it's a septic system, that includes a map of its location where practicable (abandoned systems too) and whether, to the seller's knowledge, it complies with applicable rules. According to the MPCA, a seller who fails to disclose can be liable for the cost of bringing the system into compliance plus reasonable attorney fees, and the buyer must act within two years of closing.
- A disclosure is not an inspection: the disclosure is the seller's own account. A compliance inspection is done by a state-certified inspector or a qualified local government employee.
- What an existing-system inspection looks for: sewage surfacing in the yard or backing into the house, unsafe tanks such as cracked lids, and systems failing to protect groundwater, for example cesspools, seepage pits, tanks leaking below their operating depth, or too little suitable soil above the seasonal water table. MPCA notes it does not rate system size, setbacks, or how much life the system has left.
- Certificate shelf life: a certificate of compliance is valid for three years for an existing system and five years for a newly built one, unless the local government finds evidence of noncompliance.
- Repair deadlines: a system found to be an imminent threat to public health must be fixed within ten months at most under state rules. Local ordinance sets the timeline for systems failing to protect groundwater.
Selling or buying in Cass County, North Dakota
In Cass County, septic systems are permitted and inspected by Fargo Cass Public Health, which runs the program for the Southeast Public Health Collaborative across Cass, Richland, Ransom, Sargent, Steele, and Traill counties. Its published guidance describes evaluations of existing systems as a way to help property transfers go through. It does not describe a rule that every sale needs one, so in practice the purchase agreement, the buyer, or the lender usually decides.
How an evaluation works: you submit the evaluation request form and fee, along with whatever you know about the system (installer, install year, tank size, drain field type, and a sketch of where everything sits). The tank must be pumped by a licensed pumper first so staff can inspect it with a camera. They come out the day after the tank is serviced and issue a letter of evaluation. Schedule the pump-out and the evaluation together so neither one holds up the other.
Two Cass County rules are worth knowing before you list. Existing systems that were installed and maintained legally don't have to meet today's code unless the health department finds them dangerous, unsanitary, or a nuisance. A cesspool, however, is illegal and must be removed when sewer work is done, after a complaint, or before the property can be sold. Older farmsteads are where that surprise tends to show up.
A timeline that keeps the closing on schedule
- Before listing: find the tank lids, pull any pumping receipts and permit records, and book a pump-out. Sellers who know the system's condition up front set the terms of the negotiation.
- At the offer: say in the purchase agreement who orders the inspection, who pays for it, and how repairs will be handled if the system fails.
- Two to four weeks before closing: get the county inspection or evaluation done, not the week of closing. In Clay County, the buyer needs the certificate or notice before closing.
- Winter deals: snow and frost make lids harder to reach. In Clay County, use the November–April rule and put the spring repair plan in writing.
- After closing (buyers): start your own pumping schedule, usually every 3–5 years, and keep the records. You'll need them when you sell.
Related: septic inspections · drain field repair · septic in rural Cass County · septic in rural Clay County.
Who to contact at the county
- Clay County, MN: Clay County Environmental Health, 715 11th Street N., Suite 303, Moorhead, MN 56560, (218) 299-5004
- Cass County, ND: Fargo Cass Public Health, Environmental Health, 1240 25th Street South, Fargo, ND 58103, 701-476-6729 (Mon–Fri, 7:45 a.m.–4:30 p.m.)
Sources: Clay County On-site Septic Systems · Clay County septic compliance/installation application (11/2025) · Fargo Cass Public Health On-site Sewage Treatment Systems · MPCA: Compliance inspections for SSTS · MPCA: Local septic system programs. This page is general information, not legal advice. Rules and fees change, so confirm details with the county office for your property. Last reviewed October 2026.
Frequently asked questions
Do I need a septic inspection to sell a house in Clay County, MN?
Yes. Clay County's sewage ordinance requires an existing septic system to be inspected and certified by the county before ownership transfers. The seller is responsible for requesting the compliance inspection and must give the buyer a copy showing compliance or noncompliance before closing. The county's compliance inspection fee is listed as $150 on its current application form.
Is a septic inspection required to sell a home in Cass County, ND?
Cass County's published guidance treats the septic evaluation by Fargo Cass Public Health as a service to facilitate a property transfer rather than a blanket requirement at every sale — buyers, lenders, and purchase agreements usually decide whether one happens. The exception is a cesspool: the county guidance says a cesspool is illegal and must be removed before the property can be sold. Confirm your situation with Fargo Cass Public Health Environmental Health at 701-476-6729.
Does the septic tank have to be pumped before the inspection?
For a Fargo Cass Public Health evaluation in Cass County, yes — the tank must be pumped by a licensed pumper first so staff can look inside with a camera, and they come out the day after the tank is serviced. Clay County's application asks when the tank was last pumped. A routine pump-out in the Fargo–Moorhead area typically runs $300–$600.
Can a Clay County home sale close in winter if the ground is frozen?
Yes. Under Clay County Code 6-1-10, for closings between November 1 and April 30 the seller must submit the certification inspection request to the county before closing, and the inspection must then be completed by July 1. Buyer and seller should agree in writing who handles any repairs the spring inspection turns up.
Who pays if the septic system fails the inspection?
Nobody by default — it's part of the deal. Clay County says the cost of any needed updates is negotiated between buyer and seller. Common outcomes are a price reduction, a repair credit, the seller completing repairs before closing, or money held in escrow until the work is done.
How long is a Minnesota septic compliance certificate good for?
Under Minnesota rules, a certificate of compliance for an existing system is valid for three years, and for a newly built system, five years, unless the local government finds evidence of noncompliance. Check with Clay County whether an earlier certificate will satisfy its requirement for your sale.