Many do, and each one does it differently. A septic inspection at sale in Colorado is set county by county, not by one statewide rule. The state sets the base rules for onsite wastewater treatment systems (OWTS, the official name for septic systems). Local public health agencies run the programs, and many of them have added a "transfer of title" inspection or permit before a home can sell. If you list or sell mountain homes, you need to know your county's rule before you set a closing date.
The short answer
Colorado's OWTS rules come from the state health department (CDPHE) and its Regulation 43. Local health agencies adopt rules at least as strict and handle permits. Several Front Range mountain and resort counties require a septic inspection, use permit or transfer certificate before closing. Some don't. Others have programs starting or changing. Fees, how long the permit stays valid, and winter rules all vary. Check the county health department for the property, every time.
Step by step
- Confirm it's on septic. Check the disclosure and county records. Don't assume. Some mountain towns have sewer inside town limits.
- Look up the county rule. Start at the CDPHE OWTS page, then go to the county or local health agency's site.
- Decide who orders and pays. Write it into the contract: who orders the inspection, who pays, and the deadline. In many counties the seller orders it, but that's a negotiation.
- Order early. Inspectors and county reviews take time. The permit or certificate usually has to be issued before closing.
- Use the right inspector. Many counties require a certified inspector (often NAWT-certified). Check the county's list.
- Watch the expiration date. Permits can expire after a set number of months or at closing. A delayed closing can mean a new inspection.
- Plan for winter. Snow and frozen ground can block a full inspection. Some counties allow a conditional approval with repairs finished after closing. Ask.
- Handle repairs. If the system fails, the county may require repair before closing, or allow a buyer repair agreement with a deadline after closing. Get it in writing.
- Inspect anyway. Even where the county doesn't require it, a buyer can choose an inspection. The EPA suggests regular inspection and pumping.
County snapshot (check before you rely on it)
This reflects Brian's September 2026 research on coloradomountainhomefinder.com. Rules and fees change. Confirm with the county.
| County | At-sale requirement (as researched) |
|---|---|
| Jefferson | Use permit for older systems before sale |
| Clear Creek | Use permit before sale |
| Park | Transfer of title inspection by a certified inspector |
| Gilpin | Use permit before sale |
| Boulder | Property transfer certificate |
| Larimer | Acceptance document; conditional option for frozen ground |
| Summit | Use permit at sale |
| Pitkin | Use permit with a recent inspection |
| Grand, Routt | Not required at the time of research |
| Eagle | Program announced to start in 2027 |
| Teller | Changing; county sources conflicted. Call the county. |
Fees researched ran roughly $100 to $500, plus the inspector's charge. Treat these as a starting point, not a quote.
How to explain it to your client
Say it like this (to a seller): "In this county, the septic system has to be inspected and approved before we can close. Let's order that inspection early, right after we list or as soon as we're under contract, so a county backlog doesn't push your closing. If the inspector finds a problem, we'll know about it on our timeline, not the buyer's."
Say it like this (to a buyer): "This house has its own septic system, not city sewer. The county requires an inspection before closing, and we'll make sure the contract says who orders it and who pays. Even if it passes, you'll want the pumping records and the system map, because you'll own the upkeep."
Watch-outs
- Don't assume last year's rule. Counties update fees, timing and programs. Check every time.
- Expiration traps. A closing that slips past the permit's valid date can mean starting over.
- Undocumented systems. If the county has no record of the system, the process is different and slower. Call the county early.
- Winter listings. Frozen ground can delay or limit inspections.
- Additions and bedroom counts. A system sized for fewer bedrooms than the listing shows is a red flag. Ask the county.
- Well setbacks. The septic tank and field need to sit a set distance from the well. See buying a home with a well.
- Not legal advice. Your county health department has the current rule.
Further reading
- Which Colorado mountain counties require a septic inspection at sale? on coloradomountainhomefinder.com
- Well and septic on Colorado mountain homes: what buyers check
This is training for real estate agents. It isn't legal, tax or lending advice. Check with your managing broker.
Questions
Is there one statewide septic inspection rule at sale?
No. The state sets OWTS standards. Counties and local health agencies decide whether to require an inspection at transfer.
Who orders the inspection?
Often the seller, but it's negotiable. Put it in the contract.
How long is the permit good for?
It depends on the county. Some expire in months, some at closing.
What if there's snow on the ground?
Some counties allow a conditional approval with work finished after closing. Ask the county.
Should a buyer inspect where it isn't required?
It's their choice, and many do. It's cheap compared to replacing a system.
Brian Lee Burke is the founder of PadLeaders, a Colorado real estate broker licensed since 2003, team leader of The Kenna Group at Keller Williams DTC (formerly Kenna Real Estate Group) and the author of Mastering Real Estate and The Real Estate Playbook. More about Brian.
- Agent training by Brian Lee Burke, The Kenna Group at Keller Williams DTC
- Colorado Well Permits and Septic Rules by County (coloradomountainhomefinder.com)
- CDPHE OWTS page
- Which Colorado mountain counties require a septic inspection at sale? on coloradomountainhomefinder.com
- Well and septic on Colorado mountain homes: what buyers check