Is it true that the boundary between shallow wells and deep wells is a depth of 30 meters? 【Basic Knowledge】

Why are shallow wells more prone to contamination? How does the depth affect the safety of well water?

■ Where is the boundary between shallow wells and deep wells? Wells less than 30 meters deep are called "shallow wells," while those 30 meters or deeper are referred to as "deep wells." Shallow wells draw groundwater from the "unconfined aquifer" close to the surface, whereas deep wells extract groundwater from the "confined aquifer" located beneath the "pressurized layer (impermeable layer)," which acts as a barrier preventing the intrusion of contaminants. ■ Why is the water quality of shallow wells prone to change? Because shallow wells are close to the surface, bacteria and harmful substances from animal waste can easily seep into the ground, posing a contamination risk. Additionally, the water quality can change daily due to seasonal variations, weather conditions, and the sanitary state of surrounding facilities, making it less stable compared to deep wells. ■ Can anyone safely drink well water? While some people prefer drinking well water for its pleasant taste, the water quality is not guaranteed for the reasons mentioned above. If you intend to drink it, you need to ensure proper sanitation management at your own responsibility. If you have concerns about water quality management for your facilities, please feel free to consult us.

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