Which contaminants are primarily regulated by the EPA in drinking water?

The primary regulation of drinking water contaminants by the Environmental Protection Agency (EPA) encompasses a range of substances that can adversely affect public health. Among these, microorganisms, disinfectants, and organic chemicals are significant categories of concern.

Microorganisms such as bacteria, viruses, and parasites pose serious health risks if present in drinking water. They can lead to illnesses and outbreaks, making their regulation critical for ensuring safe water supplies. Disinfectants, while necessary for maintaining water quality and preventing microbial growth, must be carefully regulated to avoid harmful byproducts that may form during water treatment processes. Organic chemicals, including various industrial solvents and agricultural runoff, can also contaminate drinking water sources, necessitating stringent limits to safeguard health.

Collectively, these groups represent the essential focus of the EPA's regulations, which aim to mitigate health risks associated with different types of contaminants found in drinking water. This comprehensive regulatory framework is crucial for protecting public health and maintaining confidence in water quality.