As of July 1, 2019 all food vendors are prohibited from providing food to a customer in disposable food service ware that is made from polystyrene foam.
Vendors are supposed to use “compostable” containers certified by the Biodegradable Products Institute (look for “BPI”) or other “suitable” recyclable plastics – which means #1 or #2 bottles, jugs or jars. The County Council is looking to amend the requirement in light of the facts that there is nowhere to compost these containers (only in an industrial compost facility which we won’t have for another couple of years) and clear clamshells are not recyclable anymore (not all take-out fits in a bottle, jug or jar).
There are some exemptions. See details on County site: http://www.hawaiizerowaste.org/reduce/foam-free-hawaii-county/