Ah well, Matala is not that large, is on a hill side, and, Well, Its Greece. They have had about 2000 years to work on their septic system. Overhead map view.
map/satillite view of Matala Greek
Has to be better than this!
New Orleans LA, USA. Below Sea level, sinking, and floods.
(Pictures of NOLA sewer system. (Note the upside down car amidst the sewage. Anybody in there??)) 
(NOLA Freepers, sorry to pick on you. Note that that arrogant swamp city Chicago flushed their sewage and industrial waste backwards through the Chicago Ship and Sanitary canal into the Illinois river for the rest of Illinois to enjoy. )