For my opinion, pls check the ...

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For my opinion, pls check the source of waste water leak which might be flow down to underground water. For the technology you can use chlorine, UV, Activated carbon. Normally we have never face much  this topic in Thailand and we dig or do the well hole to check around waste water (AD) plant. I have journal which write down of the natural fitration of the soil will make the ground water still clear with good quality with the depth 30-50 for villager and 200 for the Factory which consume 1000-1500m3 per day mix with big canal or big river including rain harvesting.