Lift stations with fewer than 100 equivalent residential connections (ERCs) pay less than $1,000/year for electricity; medium-size stations (LS-2A and ForceMain) pay the most at $6,000 to $8,000/year. Thus, three-year energy costs range from $3,000 to $24,000. Minor variability in energy consumption suggests there’s little inflow and infiltration (I/I) throughout the system.
Average annual sewage pump cost: $2,000; vacuum pump: $10,000 to $14,000. The station’s electricity bills are thus $12,000 to $16,000 per year for a three-year total of $36,000 to $48,000.
Per-lift-station annual electricity costs for a similar number of ERCs are $21/year/ERC for the gravity sewer system and $11/year/ERC for the vacuum sewer system.
Vacuum pumps inside the vacuum station. Seage pumps are located inside the collection tank, which is buried outside the pump station.