Land, water & building research
for an independent home.

Off-grid living in Illinois: a property guide

By State Off Grid Research DeskSources reviewed September 26, 2026

Private infrastructure is regulated infrastructure: IDPH and its local partners review wells and sewage systems, while the 2025 building-code baseline does not replace the need to identify the local authority and amendments.

Three files decide the project

FILE A

Land

Zoning, lawful parcel, dwelling classification, setbacks, floodplain, access and private restrictions.

FILE B

Health

Well permit and inspection; sewage site/design review, construction approval and licensed contractors.

FILE C

Building

Applicable residential baseline, local code or amendments, trades, inspections and occupancy.

Private water

Permit first. Drill second.

IDPH regulates construction, modification and sealing of non-community private wells through agreements with roughly 90 local health departments. Officials review installation plans, issue new-well permits and inspect the work.

Open the IDPH private-water program
UPGRADE

Place the well hydraulically and physically away from contamination where possible.

15-FT DRAINAGE AREA

IDPH says surface drainage should not accumulate within a 15-foot radius.

CODE SEPARATIONS

Sewage, fuel, livestock and other sources require the applicable IWWCC distances.

RECORD + SAMPLE

Preserve construction/inspection records and obtain transaction-appropriate testing.

Private sewage disposal

“No surface discharge” is still regulated.

IDPH regulates private systems with no surface discharge and systems that discharge treated effluent up to 1,500 gallons per day to the ground surface. Plans for conventional and alternative systems are reviewed before construction; local health agencies may act under ordinance or as department agents.

1,500 gallons/day—the stated upper surface-discharge scope of the IDPH private program
Who has permit authority? Which soil/site evaluation? Is the design conventional or alternative? Who may install and pump it? What operation duties continue? Is sewer “reasonably available”?

Whole-wastewater rule: a composting or incinerating toilet does not answer how sinks, showers, laundry and kitchen wastewater will be lawfully managed.

Residential construction after January 1, 2025

Baseline does not mean one permit office.

The Capital Development Board says jurisdictions with adopted codes and those without them are both subject to statutory baseline structural requirements. A municipality or county is not forced to adopt a code, but locally adopted codes must meet the state law’s minimum structural standard.

CODE JURISDICTION

Local adopted code

Check the CDB directory, adopted edition, amendments, permits, inspections, zoning and occupancy process.

NON-CODE JURISDICTION

State-law baseline

Do not read “no locally adopted building code” as no construction standard. Ask who documents compliance and what other state/local rules apply.

EVERYWHERE

Energy + trades

The Illinois Energy Conservation Code applies statewide; plumbing and other subject-specific laws remain separate.

Read the current official code FAQ

Classification changes the answer

A home, a rental, and a campground are not the same water system.

Single household

Private-well and private-sewage pathways may apply, subject to parcel and local approval.

Multiple connections

Service count and population can move water into semi-private or public-system regulation.

Home business / guests

Use, users and wastewater character can change design flow and program jurisdiction.

RV or seasonal stays

Local land use, duration and sanitation must be confirmed; a permitted well is not occupancy permission.

Illinois buyer sequence

Order the evidence

  1. 01 Boundary

    Municipal limits, county, zoning and code/health authorities.

  2. 02 Land

    Lawful residential use, dwelling, access, flood and buildable envelope.

  3. 03 Sewage

    Site/design approval, system type, reserve space and licensed installer.

  4. 04 Water

    Permit, contractor, location, construction record, yield and lab panel.

  5. 05 Home

    Applicable baseline/local code, energy, trades, inspections and occupancy.

  6. 06 Operations

    Testing, maintenance, pumping, treatment and ongoing approvals.

Open the complete buyer checklist

Evidence ledger

Official Illinois sources

Reviewed September 26, 2026. The current building-code baseline is distinguished from local administration, zoning and subject-specific state codes.

  1. IL1
    Private Water & Closed Loop Wells

    Illinois Department of Public Health · Well permits, plan review, inspections and contractor licensing

  2. IL2
    Drilled Wells

    Illinois Department of Public Health · Location, drainage, casing and contamination protection

  3. IL3
    Private Sewage Disposal

    Illinois Department of Public Health · State system scope, local agents and licensed work

  4. IL4
    Illinois Codes FAQ

    Illinois Capital Development Board · 2025 baseline law, local adoption and code directory

  5. IL5
    Illinois Energy Codes

    Illinois Capital Development Board · Statewide residential energy-code requirement

  6. IL6
    Non-Community Public Water Systems

    Illinois Department of Public Health · When a private source becomes a regulated facility supply

  7. IL7
    Illinois Flood Maps

    Illinois State Water Survey · Official flood hazard screening and map products

Methodology · Corrections