Port districts are special purpose districts established in various counties of the state for, among other things, providing marine terminals, airports, and other facilities for handling cargo and accommodating passengers. Port districts also engage in economic development activities, such as promoting tourism within the district.
Port districts are governed by a directly elected commission, and are financed primarily through local property taxes, but also through service fees, bonds, grants, and gifts.
There are currently 75 port districts in Washington State.
Prior to July 1, 2036, port districts may not prohibit trucks with a model year 2006 and older from operating on port district property.
Port districts may not penalize, or otherwise discriminate against, the operation of trucks that fail to meet emissions standards or related engine standards set by the district.