Miami County does not make anyone inspect a septic system or lagoon when a rural home sells. Even so, the county's sanitary code shapes many acreage sales here. An older lagoon is allowed to stay in service only as long as it keeps working. The first close look it gets is often the buyer's inspection. And if that inspection finds a failure, the code that applies to the replacement is today's code, not the one the lagoon was built under. On a smaller tract, today's code may not allow another lagoon.
That chain of events is what sellers with lagoons in the Paola, Louisburg, Osawatomie and Spring Hill countryside should understand before they list.
The rule that keeps an older lagoon in service
The county's own buyer guide, Rural Living in Miami County, treats inspection as a choice. If a site has an existing system, it says, "you will likely want to have it inspected as part of the purchase process." That fits the Miami County Environmental Health Sanitary Code. The code requires permits to install, alter, repair or replace a system, and it says nothing about requiring an inspection when a home changes hands.
What lets an older system stay in place is one paragraph, Section EHS-2-105B:
"Any onsite wastewater system lawfully installed prior to the effective date of this Code and used exclusively for domestic wastewater... may remain in use if, and as long as, it continues to operate in accordance with the original design and location, does not experience any system failure, and does not present any hazard to the public health, safety or welfare; however, any replacement, alteration, enlargement, repair, removal, conversion, improvement or demolition shall comply with the requirements of this Code or any later amendments, revisions or versions."
Two things in that sentence matter in a sale. The protection depends on the system working, and the code sets the test for that. Under Section EHS-2-302, a system counts as malfunctioning if it discharges onto the ground surface, into groundwater, or into a stream or roadside ditch, or if it produces offensive odors or breeds flies, mosquitoes, rats or other disease carriers. When the county finds one of those conditions, it orders the owner or user to correct it within 30 days. The other point is that any fix has to meet the current code. A system that cannot connect to public sewer and is not working as designed "shall be replaced or repaired." The plans go to the county for review, and anything beyond ordinary maintenance needs a permit and inspection.
So the older lagoon keeps its standing until the day it is found to be failing. The rebuild then has to meet whatever the rules are that day.
What a new lagoon has to clear today
This is where tract size matters. Article 6 of the Miami County code covers wastewater stabilization lagoons. Section EHS-2-601A requires, unless a waiver or variance is granted, "a minimum lot or tract size of three (3) acres per living unit" for any lagoon permit.
Section EHS-2-603A then sets the distances a lagoon must keep. They are measured from the five-foot water level of the finished lagoon, not from its outer edge.
| From the lagoon's five-foot water level to... | Minimum distance |
|---|---|
| Property line | 100 feet |
| Any surface water course | 100 feet |
| Well or surface water used for drinking | 100 feet |
| Pond or lake not used for drinking | 100 feet |
| Habitable building | 50 feet |
| Cistern | 50 feet |
| Public potable water line | 50 feet |
| Private potable water line | 25 feet |
| Uninhabitable building | 25 feet |
| Public utility lines or easements | 25 feet |
Lay those distances over a real parcel and the limits show up fast. Picture a home on a few acres with a well, a stock pond, a barn and a lot line along the road. Holding 100 feet from the property line, 100 feet from the well and 100 feet from the pond, plus 50 feet from the house, can leave no legal spot for a new lagoon. On a tract under three acres per living unit, the lagoon permit is off the table unless the owner gets a waiver or variance.
That does not mean the property has no wastewater option. The code sets no acreage minimum for conventional soil absorption systems. Those require 10 feet to property lines and 100 feet to wells or drinking-water sources for both the tank and the absorption field, and the field is sized by soil loading rate and wastewater flow. Alternative systems have no acreage floor either. They require a site and soil evaluation and approved design specifications. The county guide names mound and sand filtration systems as possible options and notes that the right choice depends on soil type, the number of bedrooms and slope. One more rule can override the rest. The code does not permit an onsite system when public sewer lies within 400 feet of the property line, unless the county finds that connecting is not feasible or reasonably available.
For a seller, this changes the question that matters. "Is the lagoon working?" decides whether anything happens at all. "What would replace it on this tract?" decides how big the problem gets.
How the issue surfaces in a sale
With no inspection required at sale, the order of events in a typical Miami County transaction looks like this:
- The listing goes live. No county inspection has happened. If the system has been working, it has likely never been inspected under the current code.
- The buyer orders an evaluation. The county's published fee schedule lists an "Existing System Evaluation Inspection" at $225. Private inspectors also do this work. The fee comes from the schedule in the published code, so confirm the current charge with Miami County Environmental Health before you count on it.
- The report describes a malfunction. Surface discharge, effluent reaching a ditch, persistent odor. Any of these is a malfunction under EHS-2-302, and the 30-day correction order applies once the county makes that finding.
- The fix runs into today's code. Repair or replacement needs plans, a permit and an inspection under the current rules. Lagoon replacement also has to meet the three-acre and setback rules above.
- The parties renegotiate. The code does not hold up the deed or require money in escrow. Buyer and seller work out the timing and cost of the fix in the contract.
Permits also stay with the owner. Section EHS-1-304C says a permit or license "is not transferable" and requires the holder to tell the county before an ownership change that involves a permitted or licensed activity.
Johnson County runs the same check on a fixed schedule
Johnson County schedules the same discovery instead of leaving it to chance. Its resale inspection page says the county sanitary code requires an inspection within the first 60 days after a property is purchased. The rule covers every part of the county except De Soto, Gardner and Edgerton. A JCDHE Environmental Health Specialist checks the indoor plumbing, the system's working parts, conditions on the lot and the county's file history. The tank has to be pumped first so its structure can be examined. The 2026 resale application lists a $260 fee. The new owner must also apply for a System Use Permit within 60 days. Any repairs need a JCDHE permit and a JCDHE-licensed installer.
The county also tells sellers to schedule the resale inspection "as far in advance of the closing date as possible to allow enough time to make any required repairs." That advice works just as well across the line in Miami County, where no rule makes anyone do it.
The water account follows a separate process
Rural sales here often involve a second utility with its own transfer rules. The county guide points buyers to its GIS/Beacon map to find which water district serves a parcel. Each district handles transfers its own way:
- Miami County Rural Water District No. 2 charges a nonrefundable $25 transfer fee to new landowners and new tenants. It uses a separate account-transfer form.
- Rural Water District No. 3 requires notice of an occupancy change within 30 days, a copy of the recorded deed and a final payment before the transfer, plus a $50 new-landowner fee. The seller stays responsible for charges until the transfer is complete.
A new well is a separate matter. It requires a county permit, registration of its type and location, and a KDHE-licensed well contractor. Where a well sits also matters for wastewater, because a lagoon has to stay 100 feet from it.
Before the sign goes up
A seller with a lagoon on a Miami County tract can answer the important questions before a buyer asks them:
- Total acreage and number of living units, compared with the three-acre-per-unit lagoon minimum
- Where the lagoon sits relative to property lines, the well, any pond and the house
- Whether any public sewer line runs within 400 feet of the property line
- Pumping and maintenance records, and any signs of the malfunction conditions listed in EHS-2-302
- Which rural water district serves the parcel and what its transfer requires
A pre-listing evaluation answers the first question the buyer's inspector will ask. The list above answers the second.
FAQ
Does Miami County have to sign off before a rural home closes? The published code does not require a county inspection or approval before a sale, and it does not say a failing system blocks the deed. It does require that malfunctions be corrected and that repairs or replacements be permitted.
Can a tract under three acres get a lagoon permit at all? Section EHS-2-601A allows exceptions to the three-acre minimum through a waiver or variance under Article 1. Separately, owners of lots recorded or platted before the code took effect can apply for a lot-size variance. The county Environmental Health Department grants it, working with Planning and Zoning, if inspection shows the system can meet every other requirement.
Do the old owner's system permits carry over to the buyer? No. Section EHS-1-304C says permits and licenses are not transferable and requires the holder to notify the county before an ownership change involving a permitted activity.
If you own acreage in Miami County with a lagoon or septic system and are thinking about selling, The Benjamin Team can help you check your tract size, setbacks and water district details against the county code before a buyer's inspector does. Request a free consultation and home or land valuation, and we'll go over your property with you.
