Examples of Overfull Septic Conditions

This image shows a septic tank that is overfull, with effluent (liquid wastewater) rising up into the riser.

Explanation:

The liquid level inside the tank has exceeded normal operating height and has breached into the riser, which should normally remain dry. This condition typically indicates that the system is not properly discharging to the drain field.

Possible Causes:

  • Clogged or restricted effluent filter
  • Blockage in the outlet line
  • Saturated or failing drain field

Concerns:

When effluent reaches the riser, it is a strong indication that the system is backing up, which can lead to sewage entering the home or surfacing in the yard.

This image shows the scum layer (oils, grease, and solids) rising into and breaching the riser.

Explanation:

The tank is severely overfull, allowing the scum layer to rise into the riser. This is a more advanced and critical condition than liquid alone breaching the riser.

Possible Causes:

  • Long-term lack of servicing/ pumping
  • Outlet blockage preventing flow to drain field
  • Drain field failure causing full system backup

Concerns:

When the scum layer reaches the riser, it indicates extreme system overload or failure. This condition can lead to immediate system backup, solids entering and damaging the drain field, and costly repairs or full system replacement.