Why are Maximum Contaminant Levels established?

Maximum Contaminant Levels (MCLs) are established primarily to protect public health from harmful contaminants found in drinking water. These levels are set based on scientific assessments of the potential health risks associated with specific contaminants, ensuring that water utilities provide water that is safe for consumption.

Setting MCLs is an essential part of regulatory frameworks aimed at limiting the concentrations of various pollutants that could pose health risks to individuals. These contaminants may include microbial pathogens, chemicals, and radionuclides, and the established levels reflect the highest permissible amount that water can contain without posing significant health risks. By doing so, MCLs help safeguard the health of communities by preventing exposure to harmful substances through drinking water.

While treatment costs, waste management standards, and aesthetic qualities are also important considerations in water quality management, the primary focus of MCLs is on health protection. The establishment of these levels is a crucial step in ensuring that drinking water remains safe across different regions, helping maintain public confidence in water safety and quality.