North -West would be the ideal position
1. Septic tank should be in the north west of building.2. Of the three parts of the septic tank water should be in East and excretion in west.3. Septic tank should not be directly touching the wall compound or the plinth of the house. It should be at least 1 or 2 ft. away. 4. The length of septic tank should be east-west and the breadth south-north 5. Tank should be higher then plinth level of the building.
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Avoid costly mistakes .Know what excalty you are going to build.
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