Separators also treat stormwater before discharge to storm drains.
Tank cleaning companies typically test waste for solvents and empty the tank using a vacuum truck. There is usually one fee for the liquid and a higher fee for sludge. See Oil for information. You may need a waste clearance permit before you dispose of the sludge as solid waste. By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site.