Yup, I went back to Scranton, PA after 25 years to find it had turned into a bedroom community for yuppies from Philly. No real work there. Some of the areas were REALLY depressed.
The wife and I just spent $25,000 on a raised septic system. The bottom of the diverter boxes had to be 3" above the pre-existing grade. I'd say $15,000 of that was fill and sand.
Fortunately our yard had an incline so now it's flat back to about 3/4 of the way.
I know where the easiest place to dig a foxhole is if the SHTF though! Just not to DEEP of a foxhole.