Video Overview
Learn about overhead sewer systems and inspecting lift stations.
This video reviews a lift station inspection at a recreational facility. The property has an overhead sewer configuration. In these systems, wastewater is typically lifted to the building sewer by a pump system, which may be installed as a standalone unit or as part of a larger lift station enclosure.
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The walk-through explains that ejector systems can vary widely depending on building size and design. Smaller buildings may rely on compact grinder pumps, while larger commercial properties often use multiple submerged lift stations housed within underground pits or vessels. In this example, several large lift stations are present beneath diamond plate covers. Refer to the Understanding Sewage or Ejector Pumps at Commercial Buildings article to learn more.
Lift Station Overview
A lift station, also referred to as a sewage pump station, is a system that collects wastewater from plumbing fixtures and drains located below the elevation of the sewer connection and uses a pump to raise the wastewater to a higher elevation. They receive wastewater from gravity piping systems and pump it under pressure to the building sewer or other designated discharge location.
When gravity drainage alone cannot reliably convey wastewater due to building design or site conditions, lift stations are a means to ensure consistent flow to the appropriate discharge or treatment point and prevent sewer backups. They are commonly found at low-lying commercial properties or sites with uneven terrain, and may be connected to either a public sanitary sewer system or a private septic system.
Inspection Scope
Inspecting lift stations is beyond the baseline scope of the ComSOP. Never enter a lift station. They are confined spaces and present serious hazards (i.e., unsafe air, engulfment, and entrapment). Specialized training and qualification are required.
However, since private lift stations are the responsibility of the property owner documenting their presence in the report is recommended. These systems require periodic and preventative maintenance to prevent equipment failure, such as pumps, floats, check valves, and alarm systems. Lack of maintenance can lead to sanitary sewer overflows (SSOs) and potential environmental contamination hazards.
Rather than testing pumps, removing covers, or entering confined spaces, document what is visible and note any observed conditions, such as damaged or deformed covers and obstructions. Refer to the Commercial Property Inspection Checklists and Field Guides Library for a sump pump/ejector pump inspection checklist.
Additional Resources for Commercial Property Inspectors: