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Stormwater disposal
The Renton Decant Station is a regional stormwater disposal facility available for use by public agencies.
At the station, Road Services manages and treats liquids and solids collected from the cleaning of roadway drainage systems designed to collect stormwater. Stormwater is water from rain or snowmelt that flows off surfaces like the ground, sidewalks or roads into the stormwater system.
Currently, due to new permit conditions and staffing limitations the King County Decant Facility is only accepting accounts from local government agencies and the State Department of Transportation for disposal material generated from cleaning of roadway drainage systems under their NPDES permits. Approval of Decant Accounts will be made directly with each agency. The agency will be responsible for any private contractors they use to decant storm water materials from the drainage systems they manage.
NPDES Stormwater Cleanings only are accepted at the Renton Decant Facility
The Decant Facility is limited by permit to receive stormwater liquids and solids generated from the routine cleaning of roadway drainage systems from agencies working in compliance with National Pollution Discharge Elimination System (NPDES) permits issued to local municipalities and the State of Washington Department of Transportation.
Prohibited waste includes, but is not limited to:
- Material generated from sources Not Related to roadway stormwater drainage systems
- Suspected or obvious contaminated waste
- Waste liquids from solid waste transfer stations
- Waste materials from sites associated with the production or handling of solvents, fuels, PCBs, pesticides, or radioactive materials
- Car wash processed water waste
- Waste liquids or solids from non-King County decant stations
- Waste from cleaning water treatment systems (filters, filter media, etc.)
- Concrete slurry waste
- Waste materials from stormwater drainage systems with known or historic contamination
- Sewage or industrial lift station waste
- Grease trap waste
- Waste materials from sanitary sewer systems or septic systems
- Construction wastewater or stormwater
- Hydro-excavation
Authorization and training
Authorization
Authorization to use the Renton Decant Station will be given to governmental agencies that complete the King County application process and satisfy all training, billing and insurance requirements and maintain a State of Washington Reseller Permit. Accounts will be set up with the municipalities, who will be responsible for private vendors they hire to manage their stormwater drainage system cleanings.
Training
Training is required for authorized users of the decant station. Each vehicle entering the decant station must have a trained person accompanying the vehicle.
Training, given by King County Road Services Decant Facility staff occurs at the King County Road Services Division headquarters in Renton, as part of the application process. Training takes approximately two hours to complete and includes classroom and field sessions. There is no cost for the training.
Insurance
Each authorized agency shall be required to present liability insurance in such amount and in such form as shall be determined by King County. Proof of insurance requires that user submit a Certificate of Liability Insurance and required endorsements. Insurance certificate renewals shall be provided to King County for record-keeping and documentation of continued coverage.
Using the Renton Decant Station
Detailed information about use of the Renton Decant Station can be found in the Regional Stormwater Decant Facility Manual:
Regional Stormwater Decant Facility Program Operations and Maintenance Manual (1MB)
Current rates
Entry fee: $81
Storm liquids: Included in the entry fee
Storm solids: $59 per ton
Hours of operation
Hours of operation are set by Decant management staff and are subject to change.
Current hours are Tuesday, Wednesday and Thursday 8 a.m. to 3:30 p.m.
Closed holidays.