What size sewage treatment tank do I need?

When it comes to selecting the right size of sewage treatment tank for your premises, there is a basic rule of thumb to follow so you know you’re getting the right size for your requirements.

For a three-bedroom house, a five-person sewage treatment tank is required. With every additional room or person per household, the tank size should increase per person. For example, if you have a four-bedroom house, you should go for a six- or seven-person capacity tank.

The capacity increase provides enough storage for the tank to handle daily water intake for the number of people in the household. If the capacity of the tank is exceeded from excess usage, the tank will overflow, releasing wastewater into the area which is hazardous to both human and environmental health. 

For communal sewage treatment tanks, the number of houses plus their occupants is taken into consideration. If you have seven three-bedroom houses, each with five occupants, then you would require a 35-person capacity tank.

If you require a tank for more than 50 people, a sewage treatment plant will require planning and installation through a qualified sanitation professional.


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