Our community is trying to build a new wastewater treatment plant.
It might sound odd at first, but maybe crowdfunding is the way to go here to raise some funds. There are a few water sustainability firms that have used crowdfunding successfully already – check out the link.
And I know last year that a Swiss firm specializing in wastewater treatment streams had a successful Series A funding round thanks to crowdfunding. Other than that, something is going to have to give somewhere if you really need new facilities. Best of luck.