It's not us that's the issue, it's when someone that has a pond grows it, seeds etc, birds that fly to other ponds, and it's as bad Water Hyacinth.
Still, we trade it and some pond person ends up with it.
Just mulch it, freeze it, compost it deep.
It's not a state by state banned plant, it's a USDA federal ban.
It's a nice dramatic plant, but heck, it grows so fast few can keep up with it for long periods and you need at least a 75 gal or larger tank just to deal with a 12-16" wide plant that grows 2-4" a day. Weekly hackings are required.
Most give up on it after a few months. I did, so has everyone else I know.
It is a highly agressive weed. Once it breaks the surface, that's when it goes into hyperdrive. It seems to be able to handle colder temps than Hyacinth so it has a worse potential further north and has a longer growing season.
Planted folks are good about weeds, but the goldfish folks, folks that have ponds and use weeds for Koi food etc are the main issue. They wioll plant weeds in local ponds and streams to have a source of fresh weeds for their fish and after the winter, sometimes the weeds are added for cover for fry and fisheries in ponds/lakes. Every once in a while we will find something the aquarist may have released but it's very rare plant wise.