Having a septic tank company come and empty the septic tank costs from $75.00 to $300.00 depending on size of septic tank and how far you are from the septic tank pumping company.
The last time I had my septic tank pumped was 4 years ago which costs me $100.00 including the traveling costs to my house.
You need to pump septic tanks every 5 to 6 years to prevent sewage backups in your home.