The 2023 rates and fees to dispose of septage at the septage treatment facility at South Treatment Plant are as follows:
|Disposal Rate||14.5 cents per gallon*
We weigh each load and charge $0.0173861 per pound discharged. This covers domestic septic tank waste and portable toilet waste, up to 2% solids.
Note: the disposal rate includes 1.0 cent per gallon on-going surcharge to provide funds for Public Health-Seattle and King County to respond to failing on-site sewage systems (OSS), provide technical support to property owners with OSS, identify and repair prioritized OSS failures, continue “what not to flush” education and outreach, and improve industry reporting.
|Fees||Annual fee: $200/year/truck
Initial setup fee: $50/truck