Sewage Holding Systems

Sewage Holding Tanks receive sewage into a single compartment and are used at sites where septic systems are not practical. On a scheduled basis or upon call-out by the homeowner a vacuum truck service will suck out the contents of the tank through an access cap, and haul the sewage to a disposal point such as a municipal treatment plant. The homeowner may call-out the vacuum truck operator after noticing a 'high level alarm condition.'

Safety Codes regulations in Alberta call for installation of sewage holding tanks to follow the Alberta Private Sewage System Standard of Practice (SOP). The SOP indicates that septic tanks must conform to Canadian Standards Association standards. As an industry leader, Tanks-a-Lot follows the most up to date standard – B66-10. The SOP provides minimal guidance as to sizing of a sewage holding tank, requiring only a one day capacity. One important factor to consider in sizing a sewage holding tank is the expected volume of sewage, which is influenced by the number, age, gender, and behaviors of the residents and by the characteristics of the installed plumbing fixtures. Another important sizing factor is the hauling capacity and pricing patterns of commercial sewage haulers serving the area. Many districts in Alberta are served by sewage haulers with 2,000 to 3,000 gallons of capacity. The following table shows popular sewage tank models from Tanks-A-Lot. Larger sewage holding systems can be readily created using two-tank solutions where tanks are interconnected in parallel.

Click on the models below for additional technical information





700 gallons; 3182 liters

RV Lots or Seasonal Use Cabins; First Nations


1020 gallons; 4600 liters

RV Lots or Seasonal Use Cabins; Remote Location with Water Saving Fixtures; First Nations


1518 gallons; 6900 liters

2 to 4 residents; popular in beach resort areas


2200 gallons; 10,000 liters

2 to 6 residents, most popular


2700 gallons; 12,300 liters

3 to 8 residents, maximum capacity for many haulers


3200 gallons; 14,000 liters

4 to 10 residents, maximum capacity for many haulers


3400 gallons; 15,500 liters

4 to 10 residents, maximum hauler capacity and scheduling cushion




3700 gallons; 16,800 liters


5000 gallons; 23,346 liters

4 to 10 residents, receives full load from large water hauler and supply cushion

6 to 10 residents, receives full load from large water hauler and supply cushion

Holding tank features:

Burial depths for sewage holding tanks are significantly impacted by site factors and mostly range between 2 feet of earth cover to 10 feet. The Tanks-A-Lot Model 1518h has the deepest burial depth rating in the underground concrete tank industry.

All sewage holding tanks from Tanks-A-Lot have the following industry-leading features:

  • Canadian Standards Association approved – CSA B66-10
  • Raised lip manhole on roof of tank for superior sealing of manhole extensions
  • 4” flexible rubber inlet for reduced failures from movement of house sewer line in the tank backfill zone
  • Cold seam one-piece construction for Models 1020HS, 1518HS, and 2200HS locks in the tank roof for superior strength and longevity of the tank
  • 20 year limited replacement warranty on materials and workmanship
  • Concrete manway cover and one roll of butyl rubber sealant for manway extension included at no extra cost