Soak pit, borewell and sump in close vicinity in Bangalore, Karnataka : Concerns regarding contamination of borewell water due to the soak pit

I have built a house near Ramamurthy Nagar, Bangalore and there is no drainage facility.  So I have a double pit where the sewage water (from kitchen, bathroom etc) overflows into the second pit. However, the pit is adjacent (15 feet) diagonally located from my neighbour's sump and borewell.  The borewell is about 350ft deep.  They are concerned that their sump water and borewell will get contaminated because of me draining my used water into the pit. 

Will it get contaminated?  Is it okay for me to continue with the pit?  Or what remedial action should I undertake?

Venkat
svraman77@gmail.com

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