Wastewater

GCSD is responsible for Wastewater Collection for approximately 1,500 residents of the Groveland and Big Oak Flat communities. The Wastewater Collection System includes 16 sewage lift stations, 35 miles of gravity mains, 7 miles of force mains, a recycled water treatment plant, 2 surface storage reservoirs, and approximately 15 acres of spray fields.

The image shows a rooftop structure surrounded by buildings, equipment, and a natural landscape with trees and hills in the background.
Wastewater Treatment Facility
The image shows a mechanical setup with large pipes and equipment inside a building, alongside a blue container outside.
Rotostrainer & Pellet Maker
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Wastewater Treatment Plant
The image shows a large, dark-water holding pond surrounded by a black tarp, set in a forested area under a blue sky.
Equalization Basin
The image shows two large metal canopies at a rural site, with a dirt area, fencing, and a clear blue sky in the background.
Drying Beds
The image shows a rooftop structure surrounded by buildings, equipment, and a natural landscape with trees and hills in the background.
The image shows a mechanical setup with large pipes and equipment inside a building, alongside a blue container outside.
The image shows a water treatment facility with processing tanks, railings, and surrounding trees and buildings in a rural setting.
The image shows a large, dark-water holding pond surrounded by a black tarp, set in a forested area under a blue sky.
The image shows two large metal canopies at a rural site, with a dirt area, fencing, and a clear blue sky in the background.
  1. Rotostrainer removes roots, rags, plastics, and other coarse debris from the incoming wastewater.
  2. Pellet Maker de-waters coarse materials and compresses it into pellets.
  3. Wastewater then flows into the Equalization Basin where it is aerated. The addition of air freshens the wastewater, removes gasses, adds oxygen, promotes the flotation of grease and oil, and aids in coagulation.
  4. Wastewater is then introduced into the Treatment Plant where it is oxygenated and fed to a thriving population of naturally occurring organisms. These organisms feed on organic materials in the wastewater, breaking them down into gasses, liquids, or to a more stable solid form.
  5. Thickened sludge is then pumped into covered Drying Beds.
  6. Disinfected liquid is pumped to a holding reservoir.
  7. During warm and dry months, the disinfected wastewater is sprayed onto irrigation fields or sent to the PMLA Golf Course for irrigation.
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