What is the MCL standard for disinfection of drinking water?

The Maximum Contaminant Level (MCL) standard for the disinfection of drinking water is focused on ensuring that pathogens and harmful microorganisms are effectively eliminated to protect public health. The correct answer emphasizes the expectation for a high level of removal, which is set at more than 99.99% of contaminants. This stringent requirement is in place because the presence of even small amounts of harmful bacteria, viruses, or protozoa in drinking water can pose serious health risks.

In achieving such high rates of removal, water treatment processes, including chlorination, ultraviolet (UV) treatment, or ozonation, are utilized to ensure that the water is safe for consumption. The high percentage indicates a robust approach to contamination control, reflecting the importance of maintaining safe drinking water standards for the protection of public health.

The other choices reflect less rigorous standards, which do not align with the recognized requirements for safe drinking water disinfection practices. Thus, the 99.99% figure underscores the commitment to minimizing the risk of waterborne diseases and maintaining overall water quality.