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Septic Tank Size
What size septic tank do you need? Length, width, depth and capacity for 5 to 50 people, with soakage pit size — for houses in AJK and Pakistan.
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About this calculator
Enter the number of people in the house to get the right septic tank size and the soakage pit for areas without a sewer line.
How it's calculated
- Sizes from the IS 2470 residential table (5, 10, 15, 20, 50 users)
- Larger tank for longer cleaning intervals
- Two chambers: first chamber = ⅔ of the length
What size septic tank for a family of 8?
About 6.6 ft × 3 ft inside with 3.3 ft liquid depth for cleaning every year; a little bigger for cleaning every 2 years.
How far should a septic tank be from a well?
At least 15 metres (50 ft).
Results are calculated from the values you enter using standard formulas. Download the PDF to keep a record. For certified testing, design or construction, talk to our engineers.
Need an engineer for your project?
Testing, design and construction across Azad Kashmir & Punjab. Call or WhatsApp us.