How long should an individual sewage treatment system last?
A properly installed and maintained ISTS should serve a residence indefinitely. Some factors that can shorten its service life include:
- Lack of routine maintenance, septic tank pumped to remove sludge.
- Dumping harmful chemicals into sewer, including septic additives.
- Surface water draining onto drainfield or over-sprinkling.
- Compaction of the soil over the drainfield, vehicles driven or parked on the drainfield.
- Mechanical failure of system components, baffles in the septic tank falling off, septic tank cracking or collapsing, or pump failure (if so equipped).

Show All Answers

1. What is a compliance inspection?
2. What is a failing system?
3. When is a compliance inspection required?
4. Does Scott County require a compliance inspection whenever a home is bought or sold?
5. When does the Scott County Zoning Ordinance cause a septic system to be reviewed?
6. If a system is found to be “failing” when must it be repaired or replaced?
7. Will the County require replacement of a failing system if it is located in an area proposed for City Sewer?
8. If a system is relatively new, will the system still need a compliance inspection?
9. How long is a compliance inspection valid?
10. How long should an individual sewage treatment system last?
11. How much does a new system cost?
12. If my ISTS is failing, will I need to replace it with a mound?
13. Does the County require all systems to be inspected and fixed?
14. Will the County’s required maintenance inspection program result in discovery of failing systems?
15. How often must my septic tank be pumped?
16. What does a maintenance inspection include and how much will it cost?