Rhode Island has initiatives to (slowly) bring along waterfront communities to the sewer system though my understanding is that they don't have the overall capacity to hook everyone up.
There are Eelgrass restoration projects happening but I don't think it was a lot and I'm not sure how successful
And unless you have connections to senior politicians or CRMC people
then you will be unlikely to backfill a marsh - though I'm sure greasing the right palms and connections will get you there
