Somewhere in the middle of the Ohio Residential Property Disclosure Form, in the water supply section, a buyer checks a single box: public. It feels like a formality in a city with its own water plant pulling from the Olentangy River. Then the septic tank access lid turns up in the side yard during the final walkthrough, or the inspector asks for a lockbox code to a health district he mentions almost in passing, and the assumption falls apart. A Delaware, Ohio address does not tell you which of three separate authorities actually regulates the water coming into the house and the waste leaving it. That gap rarely shows up in listing photos. It shows up during inspection week, which is exactly the wrong time to discover it.
Three authorities, one address
Inside Delaware's city limits, the City's own Public Utilities Department runs the show. Its water plant blends Olentangy River water with groundwater from wells drilled more than 200 feet deep, and its wastewater division treats and returns sewage through 175 miles of sewer line, 3,250 manholes, and 12 pump stations before it goes back to the river.
Step outside city limits and a second authority takes over. The Delaware County Regional Sewer District serves the unincorporated townships, while individual cities and villages run their own municipal systems. That split is drawn on purpose, not by accident, and it means a property ten minutes from downtown can sit under an entirely different sewer authority than one inside the grid.
A third authority governs anything that runs on well or septic rather than a public line: the Delaware Public Health District. It permits and inspects household sewage treatment systems for one, two, and three-family homes, reviews the designs before installation, and separately oversees private water systems, meaning wells, cisterns, springs, and ponds, in places where public water never reached. The City's own building division is upfront about the boundary: it does not review plumbing permits at all. Those go straight to the county health district instead.
The pockets that were never going to get sewer
The easy assumption is that septic is a waiting room. Sewer will arrive eventually, the thinking goes, and until then you tolerate a tank and a leach field. Delaware County's own watershed planning documents say otherwise for a specific list of places. The Olentangy Watershed Action Plan names Olive Green and East Liberty in Porter Township, Kilbourne and Leonardsburg in Brown Township, Radnor in Radnor Township, Warrensburg in Scioto Township, and Norton in Marlboro Township as areas of documented need that may not be sewered in the future at all. That is a planning document stating, in writing, that the septic system on a given parcel is not a phase. It is the infrastructure, permanently, and the cost of maintaining or eventually replacing it belongs to the owner for as long as they hold the property.
This isn't confined to older rural lots either. A preliminary subdivision plan filed with Delaware County regional planning for a development off Old 3C Highway designs every lot around a septic tank with an aerator feeding a mound system, and the plan states plainly that connecting to any future central sewer is the homeowner's own responsibility if that day ever comes. New construction in parts of unincorporated Delaware County is being built around septic on purpose, not as a placeholder waiting for city hookup.
The 50 feet that shapes the lot
Ohio Administrative Code 3701-29 sets the statewide rules for septic systems, enforced locally by county health districts, and it requires a soil evaluation by a registered sanitarian along with a minimum 50-foot setback between a private well and any septic tank or leach field. In areas with heavy clay soils, shallow bedrock, or a high seasonal water table, conditions that show up in parts of Delaware County, a conventional system often will not qualify at all, and the health district requires an engineered mound system instead.
None of that is visible in a listing photo. It is visible on a site plan, and it determines where a garage addition, a patio, or a pool can legally go, because none of it can encroach on the septic field without a variance from the health district.
Which authority governs your parcel
| Location type | Water source | Waste authority | What to verify before offer |
|---|---|---|---|
| Inside Delaware city limits | City of Delaware Public Utilities | City wastewater division | Confirm the connection is active and metered, not merely "available nearby" |
| Unincorporated township, utility-linked development | Public or private well | Delaware County Regional Sewer District, or DGHD if on septic | Ask whether the parcel sits inside the current DCRSD service boundary |
| Township named in county planning as unlikely to be sewered | Private well | Delaware Public Health District (HSTS permit and inspection) | Treat the septic system as permanent capital planning, not a temporary fix |
Inspection week: what actually gets checked
The Delaware Public Health District's role goes beyond a single walkthrough. For septic, it inspects potential new parcels to confirm there is enough area for a system, reviews the design, inspects the installation, and issues the ongoing operational permit that keeps the system legal. For wells, it inspects and samples to confirm the water is bacteriologically safe.
Whether a formal point-of-sale septic inspection is legally required before a transfer varies from one Ohio county to the next, so the safest move is to call the Delaware Public Health District directly and ask rather than assume based on the disclosure form. Where a point-of-sale inspection is required, it typically runs $300 to $600.
Locally, Wells Septic & Drain Cleaning has served Delaware and the surrounding townships for more than 20 years as a family-owned operation, and MJC Septic Services in Ostrander handles septic inspections tied to real estate appraisals. On the home inspection side, both HC Inspectors and CAI Home Inspection & Engineering offer combined well, septic, and radon testing alongside a standard inspection, with CAI noting its average inspection runs three to four hours, longer than a quick walkthrough, which matters when a well and a septic system are both part of the scope.
Radon, the number the health district doesn't test but your inspector will
Delaware County and the 43015 zip code sit in EPA Radon Zone 1, the designation for areas where the predicted average indoor screening level exceeds 4.0 pCi/L, the EPA's action threshold. Local testing across thousands of samples has put the area's own average closer to 7.71 pCi/L, and the highest individual reading on record locally has reached 116.5 pCi/L, more than 29 times the action level. Radon is listed explicitly as a hazardous material category on the Ohio disclosure form, but a seller can only disclose what they actually know. If a house has never been tested, that line on the form may simply be blank rather than clean. In a Zone 1 county, a separate radon test during the inspection period is worth adding regardless of whether the house sits on city water or a well.
What the disclosure form promises, and where its promise stops
Ohio Revised Code 5302.30 requires most sellers of one-to-four-unit residential property to deliver the state disclosure form, including the source of water supply and the nature of the sewer system, before the buyer signs the purchase contract. If the form arrives late, the buyer gets a statutory right to walk away without needing to prove damages.
That protection has a boundary, and a 2025 Ohio Supreme Court decision drew it clearly. In Ashmus v. Coughlin, buyers who planned to demolish and rebuild a lakefront home discovered a sewer line running through the property that interfered with their construction plans, then sued for failure to disclose. The court sided with the seller, holding that the disclosure form exists to flag defects affecting ordinary residential use, not to warn a buyer about limits on a specific redevelopment plan, and that a working, recorded utility line does not require disclosure just because it complicates someone's future build. Anyone buying in Delaware County with an eye toward a teardown, an addition, or a change in land use should pull recorded easements and utility maps directly rather than leaning on the disclosure form to catch that kind of conflict.
Before you write the offer
- Confirm which authority governs the parcel's water and waste: City of Delaware, Delaware County Regional Sewer District, or the Delaware Public Health District.
- If the property is on septic, request the HSTS permit and design records from the health district and ask when the tank was last pumped.
- Order a private well water test even where it isn't required, given the county's Zone 1 radon designation and the value of a documented baseline.
- Add a radon test to the inspection request regardless of water or waste system.
- If future construction or a land-use change is part of the plan, review recorded easements and utility maps yourself before the offer goes in.
Delaware's market hasn't slowed down enough to make this optional. In the three months ending May 2026, homes here sold at a median of $405,000, up 1.2 percent year over year, drew an average of two offers, and went under contract in about 44 days. That pace leaves little room to sort out which authority regulates a parcel after the offer is already accepted.
Working through it with two sets of eyes
This is exactly the kind of transaction detail where having two licensed agents on one file pays off. One person can be on the phone with the Delaware Public Health District while the other reviews the site plan for setback compliance. That's the practical version of the dual-agent model Ayana Realty Group built its practice around, and it applies just as directly to a septic-and-well property in rural Delaware County as it does to a straightforward in-city sale. If you're evaluating a property here, or want a second look at one already under contract, reach out to our team before the inspection contingency runs out. You can also browse more on Delaware, Ohio real estate and how local prices compare across Central Ohio.
FAQ
Does every home in Delaware, Ohio have city water and sewer? No. Inside city limits, the City of Delaware's own Public Utilities Department provides both. Outside the city, many properties rely on private wells and septic systems permitted by the Delaware Public Health District, and some townships are documented in county planning as unlikely to receive sewer service in the future.
How do I find out if a specific parcel is on septic before I write an offer? The Ohio disclosure form should note the water source and sewer type, but the most reliable step is calling the Delaware Public Health District directly to ask about permit and inspection history for that parcel.
Is a well water test required to sell a house in Delaware, Ohio? Requirements vary, and it's worth confirming current rules with the health district rather than assuming. Given the county's radon zone status and the value of a documented baseline, testing during due diligence is worth doing even where it isn't mandatory.
Does Delaware, Ohio require an attorney at closing? Ohio is a title state, so most residential closings run through a title company rather than a real estate attorney, though buyers with unusual land use or development plans may still want legal review of recorded easements before closing.
