The main causes of well aging and consequently performance decline are incrustation from mineral scaling, biofilm development, and microbial fouling. The presented research was conducted with the aim of examination and comparison of advantages and disadvantages of different in situ rehabilitation methods for improving well yield and water quality. Mechanical approaches which include wire brushing, jetting, and surging physically remove deposits and clogs, while chemical techniques utilize acid dissolution, oxidizing and reducing agents, and chelating compounds. Chemical techniques effectively treat iron, manganese, and calcium scales. The novel biological treatments, including enzyme-based biofilm removal and bacteriophage applications, offer a promising approach to selective and sustainable prevention of fouling. As a result, the mechanisms, advantages, and limitations of each method along with safety and regulatory considerations for their use in potable water systems are analyzed. The paper emphasizes the need for well-adapted, integrated approaches to maintain long-term functionality and protect and safe public health.