What causes ejector pit odors?
Three things almost always: biofilm on the pit walls and floats, dried check valves or pump seals letting sewer gas escape, and short pump cycles that leave a sludge layer. Treatment must address all three.
Why it happens
Biofilm is a bacterial colony on pit surfaces that generates hydrogen sulfide, the rotten-egg smell. When pump seals or drain traps dry out, they create a path for hazardous sewer gas, including explosive methane, to enter the building. Inefficient pump cycles that fail to empty the pit leave behind a layer of decomposing solids. This sludge becomes a persistent odor source.
What to check
Observe the pit for a visible slime layer on the walls and floats, which indicates biofilm. Verify that check valves are seating properly and that nearby floor drain traps are full of water. Listen for pumps that run for only brief periods, as this suggests a short-cycling problem that prevents full evacuation of waste and leads to sludge.
When to call a professional
A persistent sewer gas smell should be treated as an urgent safety issue. The gases can be toxic and flammable, posing a risk to occupants. Cleaning a pit with heavy sludge accumulation requires professional equipment and confined-space safety protocols. A qualified technician should diagnose and service any issues with pumps, seals, or controls.
How Luften handles it
Luften’s program addresses all odor sources, identified during a free site survey. We manage biofilm with continuous chemistry dosing and remove existing sludge with an initial deep cleaning. Regular service visits ensure equipment functions correctly and floats are set to prevent short cycling. Luften can consolidate ejector pit service with other building needs like drains and trash chutes.
Ejector pit and lift station treatment program