If septic systems require soil that water flows through easily, then the best place to locate a septic system is?

Answer choices:
- in soil where water drains easily
 - underground systems
 - have a positive impact on the environment
 - an area swollen with pus
 - fissures of hot, acidic water
 - marshes and swamps
 - a hemisphere is tilted away from the sun
 - To another location like underground

 

 in soil where water drains easily         