Septic Tank Prices in Seattle

Septic tank pump-out in Seattle starts from $200. Pump-out services average $400 in Seattle. Prices exclude state and local sales tax. Permit requirements, setback rules, and approved system types vary significantly by county. Always consult your county health department before installation.

Septic tank services in Seattle include pump-outs, new installations, system replacements, septic to sewer conversions, compliance inspections, absorption trench repairs, aerated treatment system installations, and effluent pump replacements. New installations in Seattle average $14,000.

A new septic system in Seattle costs $6,000–$25,000, averaging $14,000. An aerated treatment system (AWTS) costs $10,000–$30,000. Prices exclude state and local sales tax. Permit requirements, setback rules, and approved system types vary significantly by county. Always consult your county health department before installation.

Check online reviews on Google and local trade directories. Verify the contractor holds a current plumber's licence and is licensed to handle liquid waste in your state or territory. For new installations, confirm the contractor is familiar with your local council's approval process. Get at least two quotes for major work. Ask about their experience with your soil type and any council-specific requirements in Seattle.