It is frequently not an issue of money. There is currently no way to remove zebra mussels without totally trashing an ecosystem after introduction. Once established, they are a permanent resident. There is no record of any agency successfully dealing with them, and they have no natural predator/competition. Sucks when those in charge don't know what they are dealing with. If it helps, it should be stressed that this will cost PNW taxpayers millions to mitigate. This is not just a "tree-hugger" issue, by far.