This is a Notice of Availability for EPA's Preliminary Effluent Guidelines Program Plan 16 (Preliminary Plan 16), published under Clean Water Act authority. The document covers EPA's 2022 and 2023 annual reviews of effluent limitations guidelines and pretreatment standards, presents preliminary category reviews for Battery Manufacturing, Centralized Waste Treatment, and Oil and Gas Extraction, and describes analytic tools and planned studies. This is a programmatic planning document, not a site-specific NEPA action; no geographic footprint, alternatives analysis, or environmental impact assessment is present. Public comments were due January 17, 2025.12