If you're building on rural property in southeastern Oklahoma — or trying to understand a system that's already on your land — you've likely heard both terms: septic system and aerobic system. People sometimes use them interchangeably, but they're actually very different technologies with different installation requirements, ongoing costs, and maintenance obligations.

What Is a Conventional Septic System?

A conventional (or "anaerobic") septic system treats wastewater using a simple, gravity-based process. Wastewater from your home flows into a buried tank where solids settle to the bottom and lighter materials float to the top. The liquid in the middle — called effluent — flows out to a drain field, where it filters down through the soil.

The soil does most of the treatment work. Bacteria in the ground break down contaminants as the effluent slowly percolates downward. A healthy conventional system requires very little ongoing attention beyond regular pumping.

Conventional systems are simpler, less expensive, and lower-maintenance — but they only work where soil conditions and lot size allow.

What Is an Aerobic Treatment System?

An aerobic treatment unit (ATU) actively treats wastewater using oxygen. An electric aerator pumps air into the wastewater, encouraging aerobic bacteria that break down waste more thoroughly inside the tank. The treated effluent is then disinfected — usually with chlorine — before being discharged through spray heads or a subsurface system.

Key Differences at a Glance

  • Treatment method: Conventional uses anaerobic bacteria in soil; aerobic uses aeration inside the tank.
  • Complexity: Conventional has no moving parts; aerobic has motors, chlorinators, and control panels.
  • Cost: Aerobic systems cost more upfront and have ongoing maintenance fees.
  • Maintenance: Conventional requires pumping every 3–5 years; aerobic requires a maintenance contract.
  • Soil requirement: Conventional needs suitable soil for a drain field; aerobic can work where soil conditions fail.

Do I Need a Permit for Either System?

Yes — Oklahoma DEQ requires a permit for all septic and aerobic system installations before any work begins. We handle all permitting as part of the job.

Which System Do I Need?

That depends on your soil. If a perc test shows adequate drainage and there's enough space for a drain field, you can usually install a conventional system. If the perc test fails, your lot is too small, or you're too close to a water body, DEQ will require an aerobic system. Give us a call — we can assess your site and tell you exactly what's allowed.