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Septic System Cost in Illinois
Updated for 2025 • Climate Zone 5A • Labor costs 10% above national average
Low
$3,300
Average
$6,600
High
$13,200
per unit • 10% above national average
Septic System in Illinois: What You Need to Know
Illinois homeowners should consider local climate and building codes when planning this project. Get quotes from local contractors for accurate pricing.
Calculate Your Septic System Cost in Illinois
Estimate Your Septic System Cost
Your Estimated Cost
Low
$165
Average
$330
High
$660
Labor Rate Adjustment+10%
Slightly above national average
Material Choice-95%
Budget-friendly option
Estimates are for planning purposes. Actual costs vary by project specifics, contractor, and market conditions.