Septic System Cost in Illinois (2026)
Compare septic system costs across 3 cities in Illinois. Prices range from $8,100 in Aurora to $9,200 in Naperville.
State average
$8,733
Range
$8,100 – $9,200
Cities tracked
3
City comparison
| City | Avg cost | Budget range | High-end range | vs state avg |
|---|---|---|---|---|
| Naperville, IL | $9,200 | $3,300–$4,000 | $19,800–$25,300 | +5% |
| Chicago, IL | $8,900 | $3,200–$3,900 | $19,300–$24,600 | +2% |
| Aurora, IL | $8,100 | $2,900–$3,600 | $17,500–$22,400 | -7% |
Explore each city
Naperville, IL
Avg: $9,200 · $3,300–$25,300
Chicago, IL
Avg: $8,900 · $3,200–$24,600
Aurora, IL
Avg: $8,100 · $2,900–$22,400
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Frequently asked questions
The average septic system in Illinois costs $8,733. Prices range from $8,100 in Aurora to $9,200 in Naperville. Costs vary by city due to differences in labor rates, material availability, and local code requirements.