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Septic System Costs in Illinois (2026)

Based on BLS wage data, septic system in Illinois costs an average of $9,347, ranging from $8,908 to $9,954.

Illinois Average $9,347

Septic System Costs by City in Illinois

Chicago $8,908 Aurora $9,039 Naperville $9,954 Rockford $9,309 Springfield $9,528

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Alex - Founder

Reviewed by

Alex Johnson, P.E.

Mechanical Engineer • 15+ Years Home Repair Experience • Licensed Contractor

All cost data on this page has been verified against BLS and Census Bureau records. See our methodology →

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