Building permits, zoning and septic rules in Cumberland County, Illinois

Unincorporated Cumberland County does not require a county residential building permit, and the county has no building or code-enforcement office¹. Illinois does not issue building permits for privately funded construction; any permit requirement is administered by the applicable local government³. That does not mean construction is code-free: Illinois has required statewide baseline building codes since 2025, including requirements for residential work in jurisdictions without a locally adopted code³. Non-state commercial buildings in jurisdictions without a local code must be inspected by a qualified inspector who confirms compliance with the applicable codes⁹. For a true agricultural building on land where agriculture is the principal activity, Illinois limits county authority to require zoning permits, though building or setback lines may still apply¹⁰.

Cumberland County has no building or code-enforcement office for a county residential building permit¹. The Cumberland County Health Department, Environmental Health division, is the key local office for rural construction because it issues septic construction permits, inspects new or renovated systems, and handles private-well construction permits and inspections⁴. Reach the Health Department at (217) 849-3211, at 200 S Indiana St, Toledo, IL 62468, or by email at info@cumberlandhealth.org⁴. Construction in a regulated floodway follows a separate state process through the Illinois Department of Natural Resources rather than the Health Department⁸.

Unincorporated Cumberland County has no county zoning ordinance². County zoning therefore sets no minimum dwelling size, minimum lot size, setbacks, lot-coverage limit, or building-height limit there². The absence of a county zoning ordinance also means county zoning does not restrict accessory dwellings, RV occupancy, tiny-home occupancy, or temporary camping on unincorporated land². Separate septic, plumbing, floodplain, access, and statewide building-code requirements still apply. Rules vary inside municipalities: Greenup publishes its own zoning title, and the available information does not establish the zoning status of every municipality or township².

Every private sewage disposal system installed in Cumberland County needs a construction permit from the Health Department before work begins, and the applicant must notify the department at least 48 hours before installation starts⁴. The Health Department also inspects the installation of new or renovated systems and investigates complaints, acting as a local agent of the Illinois Department of Public Health, which regulates systems statewide, including those with no surface discharge and those discharging up to 1,500 gallons per day of treated effluent to the ground surface^4,11. Soils here are a serious constraint: only 3.2% of Cumberland County's land is free of severe limitations for a conventional drain field, among the more difficult counties for a standard system, so expect to need a site evaluation and likely an engineered or alternative system¹². If your system discharges to the surface, you must also complete the Not Discharging to the Waters of the United States Attestation as part of your application⁴. Off-grid options for human waste specifically are approved statewide, including privies, portable toilets, recirculating toilets, incinerator toilets and compost toilets, each with its own construction, capacity and maintenance rules, such as a 50-cubic-foot minimum privy pit capacity per seat⁷. Wells are handled by the same office: the Health Department issues construction permits and performs inspections for privately owned water wells and collects samples for lab testing⁶.

County zoning does not restrict RV living, temporary camping, tiny-home occupancy, or accessory dwellings on unincorporated land because Cumberland County has no county zoning ordinance². That answer is limited to county zoning; septic, plumbing, floodplain, access, and statewide building-code rules can still affect whether a particular setup works^3,4. Municipal zoning can also differ, so verify that the parcel is outside city or village limits². Manufactured-home communities follow a separate state regime: a newly constructed community site must be licensed and approved by the Illinois Department of Public Health before a manufactured home may be placed or occupied there¹³. That community-site rule does not establish an occupancy restriction for every privately owned parcel¹³.

First, confirm that the parcel is in unincorporated Cumberland County, because municipal zoning and construction rules can differ². Next, design to the Illinois statewide baseline building-code requirements even though the county does not issue a residential building permit^1,3. Get a soil evaluation early; only 3.2% of Cumberland County soils lack severe limitations for a conventional drain field¹². Apply to the Health Department for the septic construction permit and give at least 48 hours' notice before installation⁴. Apply to the same office for a private-well construction permit if needed⁶. Finally, check for regulated floodway and state-highway access permits before site work^8,14.

Soils are the biggest wildcard here: only 3.2% of the county's land is free of severe limitations for a conventional septic drain field, so budget for a site evaluation and likely an alternative system before you commit¹². Water is generally reliable, with about 43.3 inches of precipitation a year and severe drought in just 1.8% of years¹². Terrain is gentle and buildable, with 93.7% of the county at 15% slope or less¹². Check FEMA and IDNR floodway maps before you buy, since floodway construction is the clearest state-level permit trigger here⁸. Confirm whether the parcel falls inside any incorporated municipality's limits, since a town's own zoning or building rules would apply there even though the county itself has none². Typical carrying costs run moderate: an effective property tax rate near 1.8%, a median annual bill around $2,068, and a typical home value around $167,393¹².