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What is minimum distance between two borewells?

 The ultimate purpose of borewell is to “get good water yield ” for domestic usage, so let’s discuss it from that point onwards. Take a pen and paper and write down few points before digging the 2nd one.



  • Is yr individual house already constructed or is it yet to be constructed (provided yr land is a vacant site now)
  • At what depth did you get yield on your 1st bore well
  • How many years before did you dig your 1st bore well
  • How much available space do you have to dig a 2nd borewell (you need to check columns and beams, tie beams of foundation)
  • How many 3 plus floors of apartments do you have in your neighborhood
  • Is it really worth the expense
  • Do you experience water shortage only during summer or round the year
  • Do your neighbors have the same issue

Once you note down these answers, you will get a rough idea about the “ available distance” between two borewells or bluntly, is the 2nd borewell worth it.


Now you need to consult with a “ licensed water surveyor” who would inspect your site, will examine soil type and water table, water current (the nature, direction, and velocity of water flow below the soil). This is a scientific analysis based on mathematical calculations to give “next to accurate” predictions on the availability of water. Based on this you can decide at what depth water is available, what type of water is available (salty, hard, etc). Based on that you can derive a rough estimate for the expense

Next, you consult the local borewell company, that will inspect your site and give you a rough estimate based on their experience. Pls note, they don’t give any guarantee or warranty for water. It's purely your own risk of expense. You still need to pay them even if you don’t get water as expected.

Up to 100 - 130 ft you don’t need permission from corporation officials as it's already sanctioned in your original building plan. Moreover, your’s is an individual house, where the usage is nominal.

Usually, the soil is clay (black clay, loose clay) at the top, sand below that, followed by rock, where water is found below the rocky surface. In case yield is low, you may dig further until you hit 2nd rock surface but below that, you get “ hard water” - salty and unfit for human consumption.

If your house is in OMR, I would advise you to avoid borewell as OMR itself is a loose clay area that’s unfit for residential usage. That’s the prime reason why govt promoted OMR as an IT hub, small-medium, and heavy industry area-commercial usage. Due to the real estate boom, OMR became a residential area.

If your house is in Tambaram and nearby, it's a black clay area where agricultural activities happened few generations before. So you get a good water yield for the next few years.

So do please take a call based on the multiple criteria listed above.



Interval between two successive tube wells. 

If hard rock  between two tubewell then no relation. If combined aquifer then deeper aquifer pulls water of shallow aquifer.

Following factors affect the distance between two aquifers:

1. Formation between them

2. Depth of tubewell

3. Slope

4. Power of tubewell


Position of borewell with respect to septic tank. The minimum distance between the borewell and the septic tank should be 50'. 

For example if you have 30'X50' plot and you want to do a borewell then your borewell should be in the front and the septic tank should be in the back of the building which should be at the maximum possible distance.


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