wow straight overreaction to land sinking, that involve generations of groundwater extraction and mass usage like for agriculture. this is for showering and making some milo in a cup until water treatment plant ready in a few years.

Copilot defines shallow borewells as less than 15 meters where the water are susceptible to microbial and chemical contamination. while deep borewells is defines as below 20 meters.

however in Langkawi the borewells are between 36 meters to 45 meters under. generally speaking the deeper the borewells the better quality the water.