The water regulatory landscape continues to evolve rapidly as federal agencies, courts, states, and regulated entities adjust to shifting legal and policy priorities. Over the past year, the U.S. Environmental Protection Agency (EPA), the U.S. Army Corps of Engineers (the Corps), and state regulators have advanced significant changes affecting nearly every aspect of water regulation—from the scope of federal Clean Water Act (CWA) jurisdiction, Section 401 certifications, and stormwater regulation to per- and polyfluoroalkyl substances (PFAS) drinking water regulation, citizen enforcement, and emerging challenges involving water supply, infrastructure, and water rights across the western U.S.
