How Much Does Septic System Installation Cost in Spokane, WA?
Average septic system installation costs in Spokane range from $12,436 to $16,824. Get a free, customized estimate below.
Septic System Installation Cost Breakdown — Spokane, WA
| Item | Unit | Qty | Unit Price | Total |
|---|---|---|---|---|
| Septic Tank (1500 gal) | each | 1 | $3040.00 | $3040.00 |
| Drain Field & Gravel | linear ft | 200 | $33.25 | $6650.00 |
| Excavation & Backfill | lump sum | 1 | $1710.00 | $1710.00 |
| Labor & Permits | hr | 40 | $80.75 | $3230.00 |
| Estimated Total | $14,630.00 | |||
* Prices are estimates based on Spokane market rates. Actual costs may vary based on project specifics.
Estimate
Ref ID: EST-2026-E6S5
Date Issued
May 9, 2026
Client
Project Details
Site Address
Start Date
End Date
Scope of Work
Materials
| Material Specification | Units | Amount | Ext. Total | |
|---|---|---|---|---|
$ | $3,040 | |||
$ | $6,650 | |||
$ | $1,710 | |||
$ | $3,230 |
Labor
| Service Specification | Type | Hrs | Rate | Ext. Total | |
|---|---|---|---|---|---|
Craftsmanship Guarantee | $ | $600 |
Contractual Agreements & Conditions
Total
$15,230
Draft
Frequently Asked Questions — Septic System Installation in Spokane
How much does septic system installation cost in Spokane, WA?
The average cost for septic system installation in Spokane, WA ranges from $12,436 to $16,824, depending on project scope, materials, and labor rates. Spokane costs are close to the national average.
How do I get a free septic system installation estimate in Spokane?
Use Brixor's free online estimate generator above. Enter your project details, customize line items for your specific needs, and download a professional PDF estimate instantly. No signup or credit card required.
What factors affect septic system installation costs in Spokane?
Key factors include project size and complexity, material quality, labor rates in Spokane (WA), permit requirements, accessibility of the work area, and seasonal demand. Getting multiple estimates is recommended.