Off-Grid Living in Henry County, Illinois

I spent weeks researching Henry County's actual stance on off-grid living by reviewing the county zoning ordinance, building code enforcement standards, Health Department guidelines, and the Illinois statewide framework that underwrites all local rules. What I found is clearer than in many Illinois counties—but also reveals gaps that you will need to fill in conversation with local officials before breaking ground.

The Core Reality

Henry County has established a workable framework for off-grid living, especially on agricultural land in unincorporated areas. The county explicitly permits private septic systems and allows property owners to install and maintain them. The county zoning department recognizes agriculture (AG-1), mobile home parks (R-4), and seasonal home (R-5) districts, and uses those classifications to determine what dwelling types and land uses are allowed. But the county has not published rules on greywater reuse, rainwater harvesting, utility disconnection, or composting toilets. That silence—on paper—is not a prohibition, but it is also not a permission. Before you commit money to land or construction, you will need to contact the offices I name below and get written confirmation of what you plan to do.

The second critical fact: if your property is within an incorporated town—Cambridge is the main one—that town's zoning code and building department rules override Henry County's. You will need to research both.

Zoning: It Varies, and Location Matters

Henry County's unincorporated land is divided into zoning districts, with AG-1 (agricultural) being the most permissive for off-grid development. R-4 (mobile home parks) and R-5 (seasonal homes) have stricter use restrictions. But here is the practical implication: just because land is zoned agricultural does not automatically mean you can build a small dwelling, run a business, or live full-time off utilities. Each district has a list of "permitted uses" and "conditional uses," and those lists determine what you can actually do.

What you must do: Contact the Henry County Zoning office at 307 W. Center St., Cambridge, IL. Provide your property address or parcel number and ask: - What zoning district applies to your property? - What dwelling types are permitted in that district (single-family home, mobile home, tiny house, RV)? - Are there minimum lot sizes, setback requirements, or dwelling size minimums? - If your property borders or is near an incorporated town, does that town's zoning apply instead?

If your property is within Cambridge or another incorporated municipality, also request that town's zoning code and contact the town's building or zoning department directly. Do not assume the county rules apply.

Dwelling Types: State Law Governs, but Zoning Restricts

Illinois state law does not prohibit tiny houses, mobile homes, RVs, or alternative dwelling types. But Henry County zoning districts may. For example, an R-5 (seasonal homes) district may be designed only for cottages occupied part of the year, not primary residences. A mobile home park district (R-4) may impose size, age, or anchoring requirements. Agricultural zones (AG-1) are often more flexible, permitting both traditional single-family homes and mobile homes.

Practical implication for off-grid builders: If you are planning a small or unconventional dwelling—a tiny house on a foundation, a converted RV, an earth-sheltered home—verify that the zoning district permits your specific structure type before purchasing land. The county has no special restrictions beyond what the state requires, but the zoning district you choose will determine feasibility.

What to confirm with the Henry County Zoning office: - Is your intended dwelling type (single-family, mobile home, tiny house, RV, earth shelter, etc.) a permitted use in your district? - Are there minimum square footage or lot size requirements? - If your structure is not on a permanent foundation, does the district allow it?

Building: International Building Code 2000, Health Department Plot Plan Approval, and What That Means

Henry County enforces the International Building Code 2000 Edition as amended. This is a firm, non-negotiable floor. Any structure you build must comply with the 2000 IBC—electrical, plumbing, structural, mechanical, accessibility, and energy code chapters. The good news: the 2000 IBC is over 20 years old and well understood. The challenge: if you are using alternative materials or unconventional methods (rammed earth, cordwood, straw bale), you will need engineer certification or code official approval to demonstrate equivalency.

But there is a gate before the building permit itself: the Henry County Health Department must approve your plot plan before the county issues a building permit. This is unusual and significant. It means the Health Department is front-loading review of site conditions (slope, soils, groundwater, proximity to wells or streams) to ensure that septic systems, wells, stormwater management, and building placement will work safely and legally.

Practical implication for off-grid builders: Budget extra time for Health Department plot plan review. Have a surveyor mark the property and identify: - Soil type and percolation rate (will determine septic system suitability). - Groundwater depth. - Site slope and drainage patterns. - Distance from streams, property lines, and any existing wells. - Location of utilities (even if you plan to disconnect, they may still cross the property).

Once the plot plan is approved, you can apply for a building permit from the county. Bring proof of Health Department approval.

What to do: 1. Hire a surveyor to stake the property and map soils, water, and slopes. 2. Submit the plot plan and soil boring results to the Henry County Health Department (contact through the main county office or zoning department for the right email or address). 3. Wait for written approval before applying for a building permit. 4. Submit the approved plot plan, building plans, and proof of approval to the county building department.

Septic: Permitted, and You Can Install Your Own

This is one of the clearest, most landowner-friendly rules Henry County has published. The Henry County Health Department explicitly permits private sewage disposal systems for single-family dwellings. A property owner may install and maintain their own septic system, provided it meets the Private Sewage Disposal Ordinance and is approved by the Health Department before and after installation.

Practical implication: If you own your off-grid property outright, you have the option of doing septic work yourself (or hiring a local contractor), which can save significant cost compared to municipalities that mandate licensed engineers or contractors. But the system must be designed to code, the site must be suitable (adequate soil, adequate setback from wells and streams), and the Health Department must inspect before the system is used.

Illinois statewide rule worth knowing: Illinois state law allows composting toilets and other alternative on-site wastewater systems, regulated by the Illinois Department of Public Health. However, the Henry County Health Department may have its own list of approved system types. Check with them first.

What to do: 1. Determine if your lot is suitable for septic by submitting a plot plan and soil boring results to the Henry County Health Department. 2. Ask the Health Department which system types are approved for your property (conventional gravity septic, pressure distribution, composting toilet, constructed wetland, etc.). 3. If you plan to install yourself, confirm that the county permits owner installation (they do, in writing, but get confirmation in writing). 4. Have the system designed to code by a designer approved by the Health Department or IDPH. 5. Submit plans to the Health Department for approval before construction. 6. Install the system. 7. Request a Health Department inspection before use. 8. Keep documentation of the system specifications, installation date, and maintenance schedule.

Greywater Reuse: Unclear—Contact the Health Department

Henry County has not published any ordinance permitting or prohibiting greywater reuse (water from sinks, showers, washing machines). Illinois state law also has no explicit statewide greywater authorization, and the state plumbing code does not clearly address greywater systems.

Practical implication: Greywater is the gray zone in off-grid design. It is not banned, but it is also not clearly approved. If you plan to reuse water for irrigation or toilet flushing, you will need written confirmation from the Henry County Health Department before installing a system.

What to do: Contact the Henry County Health Department (via the main county office at 307 W. Center St., Cambridge, or the Health Department directly if you can find a phone number). Ask: - Are greywater reuse systems permitted for single-family dwellings in Henry County? - If yes, which types (sink and shower greywater only, or also washing machine water)? - What design and maintenance standards apply? - Do you require a licensed plumber to design or install the system?

If the county does not answer clearly, ask them whether they follow the Illinois Plumbing Code or any state department guidance. Write down the answer and keep a record.

Rainwater Harvesting: Legal Under Illinois Law, But Confirm Local Approval

Illinois passed the Rainwater Capture Act in 2012, which explicitly permits residents to collect and reuse rainwater for non-potable purposes—garden irrigation, toilet flushing, lawn sprinklers, and similar uses. This is a genuine permission at the state level, and it applies in Henry County.

However, the state rule has conditions: rainwater systems must be built to Illinois Plumbing Code standards, systems using storage over 5,000 gallons require licensed plumber design and approval, and the county zoning office may have its own local rules about tank placement, size, or screening.

Practical implication for off-grid builders: Rainwater harvesting is your clearest legal pathway to off-grid water supplementation. You can legally collect roof runoff and use it for non-potable purposes. But if you plan a large cistern (over 5,000 gallons), you will need a licensed plumber involved. And you should confirm with the county zoning office that your tank placement (whether buried, above-ground, or screened) complies with local setback and aesthetic standards.

What to do: 1. Design a rainwater system sized to your household needs (typical catchment: 0.6 gallons per square foot of roof per inch of rainfall; Henry County averages ~38 inches annually, so a 1,000 sq ft roof yields roughly 22,800 gallons per year if fully captured). 2. If storage is under 5,000 gallons, you may be able to install yourself (confirm with the county); systems over 5,000 gallons require a licensed Illinois plumber. 3. Contact the Henry County Zoning office to confirm tank placement is permitted (no setback violation, no aesthetic restriction). 4. For any plumbed connection (e.g., toilet flushing), ensure the system includes a label that says "non-potable water" and backflow prevention to protect drinking water.

Private Wells: Legal, but IDPH Oversight and Local Approval Required

Private wells are legal in Illinois, including Henry County. But they are not free to drill. Illinois law requires that any well contractor be licensed by the Illinois Department of Public Health (IDPH) or an IDPH-delegated local health department. The contractor must follow the Illinois Water Well Construction Code. And your county health department may impose its own distance requirements (setback from septic systems, property lines, streams) and may require testing.

Practical implication: You cannot drill a private well yourself, and you cannot hire an unlicensed contractor. You must hire an IDPH-licensed well driller, and the work is subject to inspection. The well must be designed to protect groundwater and must be sealed properly. The cost is typically $1,500–$3,500 for a residential well in Illinois.

What to do: 1. Contact the Henry County Health Department and ask: - What is the process for drilling a private well in Henry County? - What are the setback requirements from the septic system, property lines, and surface water? - Is a construction permit required before drilling? - What water quality testing is required after completion? - Is there a list of licensed well contractors they recommend?

2. Hire an IDPH-licensed well contractor (the Health Department should have a list).

3. Have the well drilled, cased, sealed, and inspected per code.

4. Test the water (bacterial and chemical) and keep records.

5. Register the well with IDPH if required (some delegated counties handle this; confirm with the Health Department).

Utility Disconnection: Unclear—Confirm with Zoning Office

Henry County has not published rules on whether you must connect to municipal water, sewer, electricity, or gas if those utilities are available to your property. Illinois state law permits off-grid living (no statewide mandate to connect), but some counties and municipalities do require connection to utilities if they run nearby—particularly municipal sewer if a public line is close. This can effectively block off-grid development even if the county allows it in principle.

Practical implication: Before you buy land intending to live off-grid, verify whether Henry County or your specific zoning district requires utility connection. If utilities are nearby, check whether a connection mandate applies. Some counties enforce this; others do not.

What to do: 1. Call the Henry County Zoning office at 307 W. Center St., Cambridge, and ask: - If municipal water or sewer lines run near my property, am I required to connect? - Are there any zoning districts that prohibit off-grid development? - Are there any covenants or mandatory connection requirements in my area?

2. If your property is in an incorporated town (Cambridge, etc.), also ask that town's building department the same questions.

3. If the county cannot answer definitively, ask to speak with the county health officer or the zoning administrator in writing.

Composting Toilets: Not Explicitly Addressed

I found no Henry County ordinance that explicitly prohibits or permits composting toilets. Illinois state law allows them (regulated by IDPH), but the county has not published a local standard. This means the county may permit them, or may require case-by-case approval.

Practical implication: Do not assume composting toilets are allowed just because there is no rule against them. Confirm with the Henry County Health Department before designing your system around a composting toilet.

What to do: Contact the Henry County Health Department and ask: - Are composting toilets permitted for single-family dwellings in Henry County? - If yes, what design and maintenance standards apply? - What approval process is required before installation?

How to Move Forward: A Practical Sequence

1. Identify your property and zoning. Know the exact address and parcel number. Check whether it is in unincorporated Henry County or within an incorporated town.

2. Contact the Henry County Zoning office (307 W. Center St., Cambridge, IL) with your address and ask: - What is my zoning district? - What dwelling types are permitted? - Are utilities required if available? - Any minimum lot size or dwelling size restrictions? - If incorporated, what is the contact for that town's zoning?

3. If incorporated, contact the town's building or zoning department and ask the same questions.

4. Hire a surveyor to map the property, soils, groundwater, and utilities.

5. Contact the Henry County Health Department with the plot plan and ask: - Is the lot suitable for septic? - Which septic system types are approved? - What are the approved uses for wells, greywater, rainwater, and composting toilets? - What is the plot plan approval process?

6. Get written confirmation of everything. Email is fine, but confirm in writing and keep records.

7. Have your building design reviewed for IBC 2000 compliance by a local architect or engineer.

8. Submit plot plan and design to the Health Department for approval, then to the county building department for a permit.

Off-grid living in Henry County is feasible, especially on agricultural land, but it requires front-loading your research and getting written permission for each system before you build. The county's rules are clearer than in some parts of Illinois, but the gaps demand that you ask directly.