Off-Grid Living in Montgomery County, Illinois

I set out to research off-grid living rules for Montgomery County, Illinois, expecting to find a coherent county framework. Instead, I discovered something that matters more: Montgomery County itself does not regulate off-grid systems. That authority belongs to individual towns. This is a crucial starting point, because it means the verdict is not "yes" or "no" for the whole county—it is "call your town."

Why Montgomery County Doesn't Set Off-Grid Policy

Illinois state law is, by national standards, relatively permissive about off-grid living. The state permits private wells under the Illinois Water Well Construction Code, rainwater harvesting under the Rainwater Capture Act of 2012, composting toilets through the Illinois Department of Public Health, and grid disconnection statewide. However, Illinois also vests zoning authority entirely in counties and municipalities. Montgomery County has chosen—or never formally established—a county-wide zoning ordinance. Instead, municipalities within the county (including Litchfield, Hillsdale, Walnut, Nokomis, and others) maintain their own zoning codes, building code enforcement, and health department coordination.

The practical result: there is no single "Montgomery County off-grid rule." What you can legally build depends on which town your land is in. If your parcel sits in an unincorporated area, you may have more flexibility, but even then, the county health department, the county building department, and possibly the county planning office may still assert authority over specific systems like septic or wells.

Zoning: The First Filter

Zoning is the foundation. If your town does not allow residential use in the zoning district where your land sits, or if zoning rules prohibit certain dwelling types, alternative systems, or disconnection from utilities, off-grid living is moot—it is simply not permitted there, regardless of what state law allows.

What I know: Montgomery County does not appear to have a unified zoning ordinance. Authority lies with each municipality.

What you must do: Contact your town's planning or zoning office and ask three things: 1. What zoning district is my parcel in? 2. Does that district permit single-family residential dwellings on raw land? 3. Does the town ordinance require connection to public water, sewer, or power when those utilities are available nearby?

This third question is critical. Several Illinois municipalities—particularly in the collar counties around Chicago—enforce mandatory utility connection ordinances. If your town has one, off-grid living is effectively illegal there, even though state law permits it. The Montgomery County Planning and Zoning Office (if it exists as a coordinating body) may be able to direct you to the right town office quickly.

Dwelling: Defining What You Can Build

Illinois state law does not restrict dwelling types, sizes, or configurations at the state level. However, municipalities often do. Some towns enforce minimum dwelling sizes, prohibit tiny houses, or forbid RVs as permanent residences.

What I know: Towns within Montgomery County set their own dwelling rules. State law does not establish minimum square footage or restrict tiny houses on foundations, and Illinois does not adopt Appendix Q of the International Residential Code for small homes.

What you must do: Ask your municipal planning office whether the zoning district allows: - Single-family dwellings on raw land (not just subdivision lots) - Dwellings below a certain square footage (some towns have minimums) - Non-traditional dwelling types (tiny houses, ADUs, or RVs as full-time residences)

If you plan to build a very small structure, off-grid or not, confirm that the town does not enforce a minimum dwelling size that would make your design illegal.

Building Code: What Standard Applies, and How Strictly

Illinois has no single statewide building code. Instead, municipalities adopt their own—most commonly based on the International Residential Code (IRC). Some counties publish a composite code; others direct applicants to the IRC plus state-level floors (the State Plumbing Code, Accessibility Code, and Energy Conservation Code).

What I know: Montgomery County likely adopts an IRC-based code, but I have not reviewed the actual adopted code or the county's amendments. Enforcement rigor and acceptance of alternative systems (like composting toilets or alternative power) vary by town and inspector.

What you must do: 1. Contact the Montgomery County Building Department and ask: "What is the adopted building code, and does the county enforce it uniformly across municipalities, or does each town have local amendments?" 2. Once you know the baseline code, ask specifically: "Are composting toilets, greywater systems, off-grid power systems, and alternative septic designs accepted under this code, or do I need variances?" 3. Contact your specific town's building department and ask the same questions—local amendments may be more restrictive than the county baseline.

Septic and Wastewater: State Permission with Local Teeth

Illinois state law explicitly permits composting toilets and alternative on-site wastewater systems, regulated by the Illinois Department of Public Health (IDPH). However, the law also states that local governments "may" impose stricter rules. Montgomery County health department and individual towns may and often do.

What I know: Composting toilets are legal under state law. However, the Montgomery County Health Department may prohibit them, require inspection and permitting, or impose conditions. I have not found accessible documentation of the county's actual rules.

What you must do: 1. Call the Montgomery County Health Department and ask: "What on-site wastewater systems do you permit? Are composting toilets allowed? What inspection and permitting process applies?" 2. Ask specifically: "Does the county require a traditional septic system, or do alternative systems have a path to approval?" 3. If traditional septic is required or preferred, ask about the septic design process, soil testing requirements (the Illinois Department of Public Health usually requires a detailed soil assessment), and approval timeline.

For a conventional septic system, the standard process statewide is: soil test (usually by a licensed soil evaluator), system design (by a licensed designer or engineer), approval by county health department, construction by a licensed contractor, and final inspection. Budget 4–8 weeks for approval and several thousand dollars for design and installation.

Greywater: The Undefined Frontier

Greywater (water from sinks, showers, and washing machines, but not toilets) is perhaps the haziest area in Illinois off-grid law. The state has no explicit greywater reuse policy, and it is not clearly authorized in statute. Some sources suggest it is permissible for subsurface irrigation (toilet flushing, landscape watering), but I have not confirmed this in accessible state law.

What I know: Illinois has not issued clear statewide guidance on greywater reuse. This is a genuine gap.

What you must do: 1. Contact the Illinois Department of Public Health (the office that oversees the State Plumbing Code) and ask directly: "Is greywater reuse permitted in Illinois? If so, what systems and uses are allowed, and what design standards apply?" 2. Contact your county health department and ask the same question locally. 3. Do not install a greywater system until you have written confirmation from both the state and your county that it is legal and what rules apply.

If greywater is permitted locally, expect to engage a licensed plumber to design the system to plumbing code standards and to seek approval from the county health department. This is not a DIY-friendly area in Illinois; budget for professional design and permitting.

Rainwater Harvesting: Legal, but with Conditions

Illinois has the Rainwater Capture Act of 2012, which explicitly authorizes residential rainwater harvesting for non-potable uses (garden irrigation, toilet flushing, landscape watering—not drinking water). Systems must comply with the Illinois Plumbing Code and be installed by a licensed plumber. Plans requiring storage above 5,000 gallons need approval.

What I know: Rainwater harvesting is state-permitted. Tanks under 5,000 gallons typically do not require approval; larger systems do. Local municipalities may impose stricter limits or require inspection.

What you must do: 1. Determine how much rainwater storage you need (gutter area × rainfall in your area, typically 40–50 inches annually in Montgomery County, adjusted for roof efficiency and desired storage duration). 2. If your system stores 5,000 gallons or less, you still need to engage a licensed plumber to design it to Illinois Plumbing Code standards. 3. If your system exceeds 5,000 gallons, ask your county health department whether it requires plan approval and what that process entails. 4. Ask your town whether it has additional limits on rainwater tank size, placement, or aesthetics.

Rainwater harvesting is the most straightforward off-grid component to implement in Illinois, but do not skip the licensed plumber step—inspectors will expect code-compliant installation.

Wells: Legal, but Regulated and Health-Department-Intensive

Illinois permits private wells under the Illinois Water Well Construction Code. Wells are permitted and regulated by the Illinois Department of Public Health or, in counties with delegated authority, by the local health department. All contractors must be licensed by IDPH.

However—and this is critical—some municipalities require connection to public water systems when they are available nearby, even if a private well is technically legal. This is the most common barrier to full off-grid living in Illinois collar counties.

What I know: Montgomery County health department (or IDPH, if the county has not taken delegation) permits private wells. However, I do not know whether your town requires connection to municipal water if it is available.

What you must do: 1. Ask your town zoning or planning office: "Does this town require connection to public water or sewer when available?" If the answer is yes, off-grid living is effectively blocked there, regardless of state law. 2. If mandatory connection is not required, contact the Montgomery County Health Department and ask: "How do I obtain a permit for a private well? What is the soil testing requirement, and who must perform it?" 3. Ask whether the county requires a licensed well contractor (standard statewide) and what the timeline is for permitting. 4. Ask about setbacks from septic systems, property lines, and pollution sources (standard requirement to protect well water).

For wells, budget 2–3 months for permitting and site evaluation, and $3,000–$8,000 for drilling and development, depending on depth and geology. The Montgomery County Health Department can usually provide a list of licensed well contractors.

Utility Disconnection: The Deal-Breaker You Must Confirm

Illinois permits living without grid power, and no state law requires it. However, some Illinois municipalities—especially suburban towns—require connection to public water and sewer systems when those systems are available nearby. This requirement does not mention electricity, but the principle is the same: some towns enforce a "you must connect" rule that supersedes state permission.

What I know: This is the single most important question to ask your town before investing in land. I have not identified which Montgomery County municipalities enforce mandatory utility connection, but it is possible and common in the collar counties.

What you must do: 1. Before buying land, ask your town planner or zoning officer explicitly: "Does this municipality require property owners to connect to public water, sewer, or power when those systems run nearby? Is there any ordinance that prohibits off-grid living?" 2. Get the answer in writing or make detailed notes of the conversation (name, date, office, exact wording). 3. If the town says yes, mandatory connection is required, do not buy land in that town if you intend to live off-grid. 4. If the town says no, or if your land is in an unzoned area, move forward with confirmation from the county health department and building department.

The Practical Sequence: How to Move Forward

If you own or are considering land in Montgomery County, here is the order in which to make calls:

1. Montgomery County Planning and Zoning Office — Ask what municipality your parcel is in, what zoning district it occupies, and whether that district allows off-grid living (no mandatory utility connection). Get the contact for the town's planning office.

2. Your Town's Planning/Zoning Office — Confirm zoning, dwelling type permissions, and mandatory utility connection rules. Ask for contact info for the town clerk and building department.

3. Montgomery County Building Department — Ask what code is adopted, whether alternative systems (composting toilets, off-grid power) are permissible, and what approval process applies. Ask for specific design guidance.

4. Montgomery County Health Department — Ask about septic, well, greywater, and composting toilet rules. Ask what soil testing and permitting are required. Request a list of licensed contractors and designers.

5. Your Town's Building Department (if separate from county) — Ask about local amendments to the building code and any additional requirements for alternative systems.

6. Your Town's Clerk — Ask for copies of the zoning ordinance and building code (or amendments). These are public records and may be online.

This sequence requires 5–10 phone calls and may take 2–4 weeks to complete. It is not a quick answer, but it is the honest path to knowing what you can legally build on your specific parcel.

A Note on Unconfirmed Rules

I have flagged several areas as "unclear" or "not confirmed"—specifically greywater and some of the municipal utility connection rules. This is not because I was careless; it is because these rules either do not exist in accessible written form or are applied inconsistently across towns. When you call the county and town offices, you may encounter the same uncertainty. If an official cannot give you a clear answer, ask for the name and phone number of the office that can, and keep calling until you have it in writing. Off-grid living in a patchwork jurisdiction like Montgomery County requires diligence, but the outcome is worth it—you will know, before you invest, whether your dream is legal where your land is.