Testing water for drinking purposes involves evaluating its safety and potability through various parameters, including pH level, total dissolved solids (TDS), hardness, microbial contamination (coliform bacteria and E. coli), presence of heavy metals (lead, arsenic, cadmium), chlorine levels, and chemical pollutants such as nitrates and pesticides. These tests ensure the water is free from harmful microorganisms, toxic chemicals, and pollutants that could pose health risks. Proper testing of drinking water is crucial to confirm its safety for human consumption, prevent waterborne diseases, and comply with health standards set by regulatory authorities.