What is required for all public wells regarding sealing?

Concrete sealing blocks are required for all public wells to ensure a proper barrier against contamination. The use of a concrete sealing block provides a durable and watertight seal that helps prevent surface water and contaminants from entering the well. It is essential for maintaining water quality and safeguarding public health. Concrete is favored because of its strength, longevity, and ability to withstand environmental pressures, making it a suitable material for sealing wells effectively.

In contrast, other materials like plastic, wood, or metal are not ideal for well sealing. Plastic may not offer the necessary structural integrity or resistance to environmental wear, while wood can rot or degrade over time, allowing for potential contaminants to seep through. Metal may corrode or fail to provide an adequate seal as well. Therefore, concrete's properties make it the preferred choice for sealing public wells, ensuring reliability and safety in water supply systems.