Good discussion here. The green water is getting people's attention much more than predictions about what could happen. My opinion is that education is the most effective preventative. Governments can develop best practices, fund educational programs and mandate things like septic inspections when transferring ownership, but can't get down to the level where it matters. That responsibility belongs to each property owner, on the shoreline and within the watershed.
The green of Kanasatka is massive. Here is a screen show showing part of the problem and a link to a panorama where you can scroll around to see the rest.
https://maps.app.goo.gl/72HufD2upCSdAi2BA