Which of the following best describes Maximum Contaminant Levels (MCLs)?

Maximum Contaminant Levels (MCLs) are established by the Environmental Protection Agency (EPA) and represent the legal limits on the concentration of specific contaminants allowed in drinking water. These limits are set based on health standards and are designed to protect public health by ensuring that the water supply remains safe for consumption. MCLs take into account the potential adverse health effects of various contaminants, as well as the technical feasibility of achieving those limits during water treatment processes.

Understanding this concept is crucial for water operators and those involved in water quality management, as adhering to MCLs ensures compliance with federal regulations and helps safeguard community health. Other options, while related to water quality guidelines, do not accurately represent the regulatory nature and public health protections that MCLs enforce. For instance, suggesting that MCLs are mere guidelines or advisory levels undermines their significance in maintaining safe drinking water standards.