The ‘polluter pays principle’ is no longer just a theoretical concept; it has become a strict financial liability. With the recent adoption of the Urban Wastewater Treatment Directive (UWWTD), the EU has introduced a mandatory Extended Producer Responsibility (EPR) scheme. This groundbreaking regulation shifts the cost of water treatment from taxpayers to specific industries, requiring pharmaceutical and cosmetic producers to cover at least 80 per cent of the costs for micro-pollutant removal. This panel explores how this regulatory shockwave redefines infrastructure funding, corporate liability and investment models in a resource-constrained world.