Which of the following is NOT a part of standard public well requirements?

A water purification system is not typically a part of the standard public well requirements. Public wells are required to meet certain construction and safety standards to ensure the water is safe for consumption. Requirements generally focus on the physical aspects of the well, such as ensuring that it is properly sealed to prevent contamination, adequate ventilation to prevent the buildup of gases, and water metering to measure water usage.

A concrete sealing block is important for preventing surface water and contaminants from entering the well, while a screened vent allows for the equalization of pressure without allowing contaminants inside. A meter is essential for monitoring water usage, also contributing to resource management.

In contrast, water purification systems can be important for treating water quality issues but are not a foundational requirement for the construction or initial safety of the well itself. These systems may be recommended or required based on specific local health standards or after testing reveals contamination, but they do not form part of the structural standards for well construction.