Sweetwater (1988)

The action takes place in a grim anarchist future civilization after a big crash or war. A young man, Allan , decides to move out of the city as his family live in. He brings his wife, Lisa, and the son to a big garbage dump located outside the city. Where they settle and survive on the waste they find on the dump. They are in many ways more closely related to each other by living this way, and Lisa eventually becomes pregnant. But there is a great shortage of water (Sweetwater) and the family of three must go out and look for water. When they discover they are not alone in staying in landfill. It will be a struggle for existence.