It's usually best to place your septic tank on or below level ground, which helps prevent flooding and seepage. In fact, if you can place your septic tank on high, non-flooding ground, so much the better. You'll also need to avoid structures, utility lines and plumbing.

The best place for a septic tank as per Vastu is in the north-west or south-east direction of the house, away from the main entrance and living spaces. As staircases are mostly found outside the houses, you can place a septic tank under the staircase as per Vastu Shastra guidelines.