Ignore the district names lol

Me and a friend were doing a co-op playthrough w/ the multiplayer mod. All was going well until my dumbass friend accidentally placed a water tower in a polluted area and caused a massive die-off of citizens before we realized what happened. ~80% of the houses are now waiting for dead body transport & I would not like 80% of our city to become abandoned :) Pls help!! We spammed crematoriums and cemeteries but I don't think it's gonna be enough.