Illinois Septic Regulations

Illinois regulates septic systems through the state health department or environmental agency. Requirements vary by county, so homeowners should contact their local health department for specific regulations, permit requirements, and approved installer lists.

Permits

Most counties in Illinois require a permit before installing, repairing, or replacing a septic system. Site evaluations, including soil and percolation tests, are typically required as part of the permitting process. Contact your local county health department for specific requirements.

Inspections

Inspection requirements in Illinois vary by county and system type. New installations are generally inspected before the system is covered. Some counties require inspections during property transfers. Advanced or alternative systems may require annual maintenance and inspection contracts.

Regulatory authority

Illinois Department of Health / Environmental Quality

Find providers in Illinois

Browse 360 septic service providers in Illinois in our directory.