What is the purpose of bacteriological sampling in a water system?

The purpose of bacteriological sampling in a water system is primarily to check for microbial contamination. This sampling process is essential in ensuring that the water supply is free from harmful microorganisms that could pose health risks to the public. Bacteriological testing typically involves measuring the presence of bacteria, viruses, and protozoa that can lead to waterborne diseases. By regularly sampling and testing for these microorganisms, water systems can implement necessary treatment processes and safeguards to protect public health.

In contrast, the other options relate to different aspects of water quality management. Chemical contaminants are assessed through specific chemical testing, not bacteriological sampling. Chlorine level checks are critical for evaluating water disinfection but fall under chemical monitoring rather than bacteriological concerns. Water pressure measurements are unrelated to microbial safety and focus on the physical dynamics of the system rather than health-related microbial risks. Thus, the primary aim of bacteriological sampling is to ensure the microbiological safety of the water supply, confirming the correct answer.