Colorado Septic & Well Rules for Home Sales

Your State

Septic Rules When a Colorado Home Sells

Local rules apply

Who May Inspect: Set by the county. Larimer County requires a third-party inspector with current NAWT Inspector certification who is also licensed by the county. El Paso County maintains a published list of Transfer of Title Certified Inspectors, who may not perform routine O&M inspections.
Report Rules: Set by the county. Larimer County requires the report submitted through OnlineRME on a NAWT-based form before closing, after which the county issues an Acceptance Document valid about 12 months; repairs can be deferred up to 180 days after closing under an Agreement to Repair.
County Programs: Counties with transfer-of-title programs have included Adams, Arapahoe, Boulder, Clear Creek, Douglas, El Paso, Elbert, Gilpin, Jefferson, Larimer, Park, Pitkin and Summit. The list changes, so check CDPHE's local agency map and the county public health agency.
Advanced Systems: Regulation 43 requires a mandatory O&M program for higher-level treatment systems used to reduce a setback or soil treatment area. The owner must keep an active maintenance contract at all times, with minimum inspection frequencies that differ for systems with mechanical components.
Pump-Out Rules: No statewide pump-out interval. Some county programs require pumping or a tank inspection as part of a transfer-of-title inspection, and Regulation 43 sets minimum maintenance frequencies for higher-level treatment systems.

Set and enforced by Colorado Department of Public Health and Environment, On-site Wastewater Treatment Systems Program. Confirm the rule for a specific property with them or the county health office.

Private Well Rules When a Colorado Home Sells

No statewide rule

Colorado does not require a well water test or inspection at sale. What state law does require is that the well permit record be updated: a Change in Well Ownership form is filed with the Division of Water Resources when the property changes hands.

Who May Test: No statewide requirement. Testing is normally done through a CDPHE-certified drinking water laboratory, and county public health departments provide sample kits and guidance. No state rule restricts who may collect a transfer-related sample.
What Is Tested: No statewide requirement at transfer. CDPHE recommends total coliform and E. coli plus nitrate annually, and uranium, arsenic, radon and lead at least once. Any flow or yield test at closing comes from the contract or the lender.
Disclosure at Sale: No standalone state well disclosure form, but the Colorado Real Estate Commission's Seller's Property Disclosure (Residential) has a dedicated water section covering the well, well permit, water quality and yield, and the approved Contract to Buy and Sell addresses well permit and water rights transfer.
Unused Wells: Under 2 CCR 402-2 Rule 16, the well owner is ultimately responsible for having a well no longer intended for use properly plugged, sealed and abandoned. A licensed well construction contractor may plug any well; owners may plug only simple wells. Not triggered by transfer.
Distance From Septic: Under 2 CCR 402-2 Rule 10.2.2, a well must be at least 50 feet horizontally from a septic tank or sewer line and 100 feet from a leach field. A shorter distance requires a written variance approved by the Board of Examiners before construction.

Set and enforced by Colorado Division of Water Resources (Office of the State Engineer); Colorado Department of Public Health and Environment for water quality. Confirm the rule for a specific property with them or the county health office.

County and Town Rules in Colorado

12 localities ask for something extra when a property changes hands. Everywhere else in the state, the state rules above are the whole answer.

Adams CountySeptic

Selling an Adams County property on septic triggers an OWTS Use Permit, which requires a passing third-party inspection first.

What Is Required: A NAWT-certified Use Permit inspector checks the tank, electrical, controls, pumps and soil treatment area on the county form. Deficiencies must be repaired with proof before the permit is issued.
When: Needed before closing. The permit is valid until closing or twelve months, whichever comes first.
Filed With: Application, fee and full inspection report go to the Adams County Health Department, which issues the permit.

Confirm with the locality before you rely on it: Adams County source page.

Archuleta CountySeptic

An Archuleta County property on septic needs a Transfer of Title inspection and an Acceptance Document from the county before closing.

What Is Required: A third-party NAWT-certified inspector inspects the OWTS and files the report, with a Transfer of Title application to the county's Water Quality Department.
When: Application due at least two weeks before the expected closing date. Validity not specified.
Filed With: Reports and application go to the Archuleta County Water Quality Department, which issues the Acceptance Document.

Confirm with the locality before you rely on it: Archuleta County source page.

Boulder CountySeptic

A Boulder County property on septic needs an inspection and a Property Transfer Certificate from Public Health before closing.

What Is Required: An OWTS inspection, any required repairs done under permit, and a Property Transfer Certificate application. A failed inspection must include photos of the malfunction.
When: All of it prior to closing, or a conditional transfer via a notarized Agreement to Repair allowing 365 days after closing. Validity not specified.
Filed With: Inspection reports and the application go to Boulder County Public Health, which issues the certificate.

Confirm with the locality before you rely on it: Boulder County source page.

Clear Creek CountySeptic

Clear Creek County requires a Use Permit before closing on most homes with septic, including any system with a component older than five years.

What Is Required: A Use Permit application, a Transfer of Title inspection by a qualified inspector, the inspection form with a tank pumping receipt and the MLS listing, plus a $100 fee.
When: Before closing; allow 5-10 business days. Permit is valid 12 months or until closing, whichever comes first, and is not renewable.
Filed With: Goes to Clear Creek County Environmental Health. If the seller skips it, the buyer must get one within 30 days of closing.

Confirm with the locality before you rely on it: Clear Creek County source page.

Douglas CountySeptic

In Douglas County the seller must obtain an OWTS use permit before the property is sold.

What Is Required: An inspection by a third-party NAWT-certified Use Permit inspector, submitted with the use permit application to the county health department.
When: Before the sale. The page does not state a validity period.
Filed With: Inspection report and application go to the Douglas County Health Department, Environmental Health.

Confirm with the locality before you rely on it: Douglas County source page.

Elbert CountySeptic

Elbert County requires a Use Permit for a transfer of title on a property served by septic.

What Is Required: An inspection report from one of the county's licensed inspectors, submitted with the septic application for the Use Permit.
When: Not specified.
Filed With: Application and inspection report go to Elbert County Public Health and Environment.

Confirm with the locality before you rely on it: Elbert County source page.

Gilpin CountySeptic

Selling a home in unincorporated Gilpin County means getting the septic system inspected and a Use Permit issued before the closing date.

What Is Required: A septic inspection with the Use Permit application (Form 700), inspection report (Form 701) and tank pumping report (Form 702). Higher-level treatment systems also require the buyer to get a maintenance contract and operating permit.
When: Before the transfer date; allow ten business days. Permits are valid 6 months and the application must be within 6 months of the inspection.
Filed With: Submitted through the county's online permit portal to Gilpin County Environmental Health.

Confirm with the locality before you rely on it: Gilpin County source page.

Jefferson CountySeptic

Jefferson County requires a septic inspection and a Use Permit before a property with a system older than five years is sold.

What Is Required: Tank pumping and inspection plus a certified inspector's review of the rest of the system, submitted with the application and fee. A failed system needs a repair permit, or a buyer's signed agreement to repair after closing.
When: Before the sale; allow about ten days to process. The permit lasts 6 months or until the property sells, renewable once for 6 months.
Filed With: Pumping and inspection reports, application and fee go to Jefferson County Public Health, Environmental Health Services.

Confirm with the locality before you rely on it: Jefferson County source page.

Larimer CountySeptic

A Larimer County property on septic needs a transfer-of-title inspection and an Acceptance Document from the health department before the sale closes.

What Is Required: An inspection by a NAWT-certified third-party inspector licensed by Larimer County, with the report submitted to the county. If weather or access prevents it, the parties sign an Agreement to Inspect.
When: Report must reach the county before the transaction is finalized. The Acceptance Document is valid until closing or 12 months from the inspection date.
Filed With: Inspectors submit reports to the Larimer County Department of Health and Environment through OnlineRME.

Confirm with the locality before you rely on it: Larimer County source page.

Park CountySeptic

Park County requires a Transfer of Title permit for a property served by an onsite wastewater system, under section 43.4.L of its OWTS regulations.

What Is Required: A Transfer of Title inspection report for the OWTS from a county-certified inspector, submitted with the Transfer of Title permit application per the county's checklist.
When: Not specified.
Filed With: Goes to the Park County Environmental Health Department.

Confirm with the locality before you rely on it: Park County source page.

Pueblo CountySeptic

Pueblo County requires the septic system to be pumped, inspected and approved by the health department before a home or commercial building on septic can close.

What Is Required: Tank pumping with lids uncovered and the soil absorption area located, plus an inspection by PDPHE or a registered NAWT-certified Transfer of Title inspector. Non-compliant systems must be brought into compliance under permit.
When: Before closing; PDPHE aims for 3-5 business days. The Acceptance Document is valid 12 months or until title transfers, whichever comes first.
Filed With: Application and fee go to the Pueblo Department of Public Health and Environment, which issues the Acceptance Document.

Confirm with the locality before you rely on it: Pueblo County source page.

Summit CountySeptic

Summit County requires a Use Permit before the transfer of title on any property with an OWTS more than five years old.

What Is Required: An inspection by a NAWT-certified Use Permit inspector on county forms, with a record drawing and tank and soil-treatment-area detail. Mechanical components and the soil treatment area each need a report from the previous 12 months.
When: Before closing. The permit is valid until closing or a maximum of twelve months; a term of 6 months or less may be renewed once.
Filed With: Application and inspection reports go to Summit County Public Health, Environmental Health.

Confirm with the locality before you rely on it: Summit County source page.

Only localities with a rule of their own are listed, and only where the rule was found on that locality’s own page. A county missing from this list may still have one that is not published — ask the county health office.

What a Septic Inspection CoversTank, distribution, pumps, drainfield, loading, records

A septic inspection is not part of a standard home inspection, and walking the yard with a probe is not an inspection. These are the parts an inspector is expected to open, look at and write up.

The Tank

Opened at the manhole, not just the inspection port. Sludge and scum measured, baffles or tees checked, effluent filter pulled and cleaned, walls and lid checked for cracks and leaks.

Distribution

Distribution box, drop boxes, diverter valves and the pipes between them, checked for level, roots, standing effluent and blockage.

Pumps and Controls

Pump tank, float settings, alarm test, control panel and run-time counters. On an advanced system, blowers, media and disinfection units too.

The Drainfield

Trenches, beds or drip lines walked for ponding, breakout, odor and soggy ground, plus grading and roof runoff that pushes water into the field.

Size and Loading

Permitted design flow in gallons per day or bedroom count, from the health department record, compared with how the house is actually being used and marketed.

The Paper Trail

Permits, as-built drawing, pump-out receipts, service contract, operator reports and any lab results. Missing records are a finding of their own.

What the Buyer’s Loan RequiresFHA, VA, USDA, conventional and 203(k)

State law decides what the inspection has to contain. The loan program decides whether the deal can close with what the inspection found. These rules are federal and apply in every state.

Loan	When an Inspection Is Required	Well Distances	Water Testing	If It Fails
FHA	No septic inspection on every loan. One is required only if the appraiser sees evidence of failure, state or local law requires it, or the lender asks. A well water test is required in specific listed situations.	4000.1 sets: well 10 ft from property line, 50 ft from septic tank, 100 ft from drainfield or seepage pit, 50 ft from non-watertight sewer lines. A July 2026 FHA waiver lets existing homes use local distances instead if water testing is documented.	Required for new construction, when the appraiser reports a well problem, when water is known unsafe, near landfills or farms, or when well-to-septic is under 100 ft. A disinterested third party samples; local or EPA limits apply; report under 180 days old at disbursement.	The system must meet Minimum Property Requirements before FHA will insure. Health and safety deficiencies are repaired before closing. A repair completion escrow is allowed only when work genuinely cannot be finished first, such as weather delays.
VA	No septic inspection on every loan. The appraiser looks first; a licensed inspection or local health authority approval is required only if problems show, soil conditions are known to be poor, or state, local, or lender rules require it.	Not specified by the program. VA Chapter 12 sets no well-to-septic or well-to-line distances and defers to the local or state health authority with jurisdiction. Secondary lender guides sometimes quote FHA's numbers, but VA itself does not.	Required when the home has a private well. A disinterested third party must collect and test the sample; the borrower may not. Local health authority standards apply, then state, then EPA. Lenders commonly treat the certification as valid for 90 days; confirm the window with the lender on the file.	A septic or well failure is a defective condition, so the home is unacceptable until repaired and further damage is ruled out. Repairs are generally completed before closing; veterans may request a VA waiver of repair requirements in limited cases.
USDA Guaranteed	Strictest of the five. A septic evaluation is required on every home with an individual system, by a HUD roster appraiser, health authority, licensed septic professional, or qualified home inspector. A water test is required on every well property.	USDA adopts HUD Handbook 4000.1 distances (10 ft to property line, 50 ft to septic tank, 100 ft to drainfield) or the actual distances accepted by the state or local health authority. The septic must sit entirely on the subject property.	Required on all wells, performed by the local health authority or a state-certified lab. State or local standards apply, or EPA maximum contaminant levels if none exist. The water analysis report must be no more than 150 days old at closing.	The system must be repaired so the home is decent, safe, and sanitary. A post-closing repair escrow is possible only if the work does not affect livability, costs 10 percent or less of the loan, is under contract, fully funded, and done within 180 days.
Conventional	Most permissive. Neither agency requires a septic inspection or water test on every loan. One is ordered only when the appraiser notes a problem, a nearby environmental hazard raises concern, or state, local, or lender rules require it.	Not specified by the program. Fannie Mae and Freddie Mac set no separation distances and instead require that utilities meet community standards, which in practice means the local health authority's rules govern.	Not routinely required. Fannie Mae calls a well certification sound judgment when the lender has reason to believe water may be contaminated, such as a well near a hazardous waste site. No contaminant list or validity period is published.	The lender decides whether the home is adequate security and what inspections are needed. Appraisals are typically made subject to repair or professional inspection, with evidence of corrective action kept in the loan file before closing.
FHA 203(k)	Same triggers as standard FHA, with one key difference: a known bad system does not have to be fixed by the seller first. Repairing or replacing a well or septic system is an eligible improvement that the loan itself can finance.	Same FHA Handbook 4000.1 distances apply (10 ft to property line, 50 ft to septic tank, 100 ft to drainfield). New or replacement systems installed with loan funds must meet local permitting as built.	Same as standard FHA: testing in the listed trigger situations, by a disinterested third party, against local health authority standards or EPA limits, with the report no more than 180 days old at disbursement.	This is the real advantage. Repair or replacement costs are escrowed at closing and the work is done afterward, so the deal does not die on a failed system. Limited 203(k) caps total rehabilitation at 75,000 dollars; Standard 203(k) has no such cap.

Loan rules change and lenders add requirements of their own. Confirm with the lender on the file before you tell a client what is needed.

A Timeline That Protects the Closing DateSix steps, from listing to closing

Nearly every septic delay comes from the same place: the inspection was ordered late, and the report, the repair permit or the health department review ran past the contract date.

1
Before You List
Pull the permit and service history from the health department. A seller who knows what a buyer’s inspector will find can fix it or price it instead of renegotiating against a deadline.
2
Day One of Due Diligence
Order the inspection. Not day seven. In several states the inspector has up to ten business days to deliver the written report, and that clock runs inside your contingency.
3
Inspection Day
Power on, water on, lids reachable. Many inspectors want the tank pumped so the walls and baffles can be seen, which means booking the pumper the same day.
4
When the Report Lands
Read the parts that were not inspected and the reasons given. That list is usually where the next surprise is hiding.
5
Repairs and Permits
A repair or replacement normally needs a health department permit, and sometimes a soil evaluation. Build the review time into the extension, not just the contractor’s schedule.
6
Before Closing
Hand the operating permit, manual, service contract and maintenance log to the buyer, and make sure an advanced system has a licensed operator from day one.

What to Collect From the SellerEight documents to ask for at listing

Ask at listing. Every one of these is a document a lender, inspector or health department may ask for later.

Construction and Operating Permit. Shows the permitted flow, the bedroom count the system was approved for, and any ongoing conditions.
As-Built Drawing. Locates the tank, distribution box and field. Without it the inspection starts with a search.
Pump-Out Receipts. Five years where the county sets a pumping interval, three years everywhere else.
Service Contract. Required for advanced and aerobic systems in most states, and often required to be in force at transfer.
Operator Service Reports. The last two years, including anything filed with the health department.
Lab and Sampling Results. Where the permit requires sampling, or the system discharges to a stream or ditch.
Well Records. Well completion report, depth, the most recent water test, and any treatment equipment.
Repair Permits and Invoices. Any work on the tank, pump, field, control panel or well.

Homeowners keep all of this free in TankVault, and their septic company keeps it current. See the homeowner app.

Questions Agents Ask

Can a home inspector inspect the septic system?

It depends on the state. A growing number of states allow septic inspections only from someone holding an onsite sewage license, such as an operator, installer or soil evaluator, and an inspection by the wrong person may not satisfy the lender or the contract.

How long is a septic inspection good for?

There is rarely a date written into law, but lenders and buyers commonly treat an inspection older than six to twelve months as stale, and some states require the inspection to fall inside a set window before transfer.

Who pays for the septic inspection?

It is negotiable in nearly every state and the purchase contract decides. Sellers increasingly pay for an inspection before listing so the findings are theirs to handle rather than a renegotiation tool for the buyer.

Can you close on a house with a failing septic system?

On a government-backed loan, usually not until repairs are finished and verified. Conventional financing has more room, but the appraiser can still call out the condition and the lender can require it fixed before closing.

Does the septic permit transfer to the buyer?

In most states the operating permit runs with the property rather than the owner, and the upkeep duties travel with it. Some states and counties make the new owner file or register within a set number of days, and an advanced system usually needs a licensed operator from day one.

Why does the inspection report not say pass or fail?

Several states now forbid pass or fail wording and require the inspector to describe the condition of each part and what any problem means instead. It reads as less decisive and it is far more useful in a negotiation.

Does the well have to be tested when the house sells?

In most states only when the buyer, the contract or the loan asks for it. A handful of states require a test at transfer, and FHA, VA and USDA loans require one on any home served by a private well.

Where This Comes From7 sources for Colorado

General information for real estate professionals, not legal advice. Colorado rules change, and counties add their own, so confirm the requirement for a specific property with the agency above or the county health office.

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Septic and Well Requirements for Colorado Home Sales

Septic Rules When a Colorado Home Sells

Private Well Rules When a Colorado Home Sells

County and Town Rules in Colorado

The Tank

Distribution

Pumps and Controls

The Drainfield

Size and Loading

The Paper Trail

Before You List

Day One of Due Diligence

Inspection Day

When the Report Lands

Repairs and Permits

Before Closing

Questions Agents Ask

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