Beginning in 2024, floating plastic foam used for overwater structures must be encased in durable shell

New regulations in 2024 for floating docks
Photo courtesy Department of Ecology

OLYMPIA – Beginning January 1, 2024, Washington waters will harbor less pollution from the plastic foam used to support floating docks and walkways. 

New requirements mean that the expanded polystyrene used to float most overwater structures must be fully encased in concrete, aluminum, steel, or plastic to prevent it from breaking up and dispersing when the material becomes waterlogged or damaged.

Dock owners are not required to immediately replace non-compliant, exposed foam floats but will need to upgrade when the time comes to replace or repair those existing structures. 

The new law reinforces standard practices in the dock-building industry as well as existing regulations administered by the Washington Department of Fish and Wildlife. 

Small floating buoys are exempt from this law, but foam-free alternatives are encouraged for recreational crabbing and fishing.

“Boaters, anglers and others who enjoy Washington’s waters see first-hand the mess created when exposed white foam breaks down into tiny beads, polluting shorelines and endangering aquatic animals,” said Solid Waste Management Program Manager Peter Lyon. 

“This new requirement formalizes a modern practice of reputable dock builders who use fully encased foam.”

--Dept. of Ecology