Vacuum sewers can be installed more affordably, and cost less to maintain and operate, than gravity systems. Here's how they work:

  • A traditional gravity line carries wastewater from the customer to a valve pit package.
  • When 10 gallons of wastewater collects in the sump, the valve opens and differential pressure propels the contents into the vacuum main.
  • Wastewater travels at 15 to 18 feet/second in the vacuum main, which is laid in a sawtooth pattern to ensure adequate vacuum levels at the end of each line.
  • Wastewater enters the collection tank; when it fills to a predetermined level, sewage pumps transfer the contents to the treatment plant via a force main.
  • Vacuum pumps cycle on and off as needed to maintain a constant level of vacuum on the entire collection system.
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