Salem

Columbiana County's primary cross-county overlay is FEMA NFIP floodplain regulation, coordinated through the County Engineer's office (Bert Dawson, P.E., P.S., who is also the long-serving County Sanitary Engineer) and through township floodplain administrators in zoned townships under the county's NFIP participation. There is no countywide coastal overlay - Columbiana sits on the Ohio River along the West Virginia and Pennsylvania border but the river overlay is a flood corridor, not a coastal-management overlay. Wildland-urban-interface fire overlay is not used; the Appalachian-foothill geography in the eastern townships does create wildfire risk on wooded parcels but not via a regulatory overlay. Historic-district overlays exist at the municipal level (most notably the National Register-listed Lisbon Historic District, central Salem, downtown East Liverpool, and several pottery-era industrial districts along the Ohio River) but those are city- or village-level designations, not county overlays. The East Palestine 2023 Norfolk Southern train derailment has generated a federal EPA cleanup zone and ongoing soil and groundwater testing inside and immediately around East Palestine; this is a federal/state environmental footprint that can affect new-construction siting and lender appetite in that area, but is administered by U.S. EPA and Ohio EPA rather than by a county zoning overlay. The most operationally significant overlay an ADU applicant in Columbiana County is likely to encounter is FEMA SFHA along the Ohio River corridor (East Liverpool, Wellsville, Liverpool Township, Yellow Creek Township) and along the Beaver Creek and Little Beaver Creek systems in the southern and eastern townships.

• FEMA NFIP Special Flood Hazard Areas in Columbiana County — Designated Floodplain Administrator (DFPA) contacts for each NFIP-participating community in Columbiana County are maintained on the ODNR Division of Water Resources Floodplain Management list; ODNR contact for the program is (614) 265-6750. Applicants should confirm whether the parcel is in a zoned or unzoned township, since unzoned townships have no township floodplain administrator and must route through the county.
• Little Beaver Creek State and National Scenic River — Beaver Creek State Park is the largest contiguous publicly owned tract along the corridor and constrains private ADU development on adjacent inholdings.
• East Palestine Norfolk Southern derailment EPA cleanup footprint — Applicants in or near the cleanup footprint should expect environmental Phase I (and sometimes Phase II) due diligence from any lender, and should request the most current ODH-coordinated well-water testing results from the Columbiana County Health Department before committing to an on-site sewage or private well design.
• Townships without an adopted chapter-519 zoning resolution — Applicants are advised to confirm current zoning-adoption status with the specific township board of trustees, since townships occasionally adopt or rescind zoning. The County Building Department permit step still applies whether or not the township is zoned. The Zook Cabins 2026 Ohio guide attributes Columbiana County's comparatively permissive reputation for tiny-home and accessory-building work in part to the prevalence of unzoned townships and the county's relatively light review posture.
• Municipal historic districts (Lisbon, Salem, East Liverpool, other communities) — An ADU on a parcel inside a designated historic district commonly faces additional materials, fenestration, and massing review; in unincorporated areas the historic-district step is generally absent.

Permit responsibility in unincorporated Columbiana County is split four ways, with the County Building Department itself acting as the certified residential building department for unincorporated areas - a structurally different posture from many rural Ohio counties (such as Ashland) that delegate residential plan review to a city under contract. (1) Township zoning permits for any new residential structure, including an ADU as an accessory residential use where allowed, are issued by the zoning inspector of the township the parcel sits in. Townships without an adopted zoning resolution have no township-level zoning permit step. (2) Residential and commercial building permits in unincorporated Columbiana County, and in the smaller villages that have not stood up a separate building department (e.g., Hanoverton, Leetonia, Minerva, New Waterford, Salineville, Summitville, Washingtonville), are issued by the Columbiana County Building Department at 105 South Market Street, Lisbon, OH 44432, (330) 424-6604. The department uses the 2019 Residential Code of Ohio with amendments as its residential standard. Cities and larger villages that maintain their own building departments - Salem, Columbiana, East Liverpool, East Palestine, Lisbon, and Wellsville - handle their own permits for parcels inside their corporate limits. (3) Plumbing permits and on-site sewage approvals throughout the county route to the Columbiana County Health Department at 7360 St. Rt. 45, Lisbon, OH 44432. (4) Floodplain development permits for unincorporated parcels coordinate through the County Engineer (Bert Dawson, P.E., P.S.) under the county's participation in the National Flood Insurance Program; township-level floodplain administrators may also exist for zoned townships. An ADU project on an unincorporated parcel therefore typically requires: a township zoning permit (if the township is zoned), a Columbiana County Building Department residential permit, a Health Department plumbing/septic approval, a floodplain permit if mapped, and an address assignment.