Which category is NOT listed as a drinking water contaminant category?

• A. Lead and Copper Rule Contaminants
• B. Microbiological Contaminants
• C. Organic air pollutants
• D. Surface Water Treatment Rule and related rule (IESWTR, LT1ESWTR, FBRR) contaminants

Answer: (C)

Contaminant categories in drinking water are organized by the type of contaminant or the regulatory treatment framework used to address them. Microbiological contaminants cover bacteria, viruses, and protozoa. Lead and copper rule contaminants fall under inorganic contaminants regulated for corrosion control. The Surface Water Treatment Rule and related rules set treatment requirements for water sourced from surface waters. Organic contaminants is a standard category for pollutants like solvents and pesticides.

Organic air pollutants does not belong in this set because it refers to pollutants in air, not drinking water. Hence it’s not listed as a drinking water contaminant category.