A proposed fourth stage of wastewater purification, designed to filter out pharmaceutical residues and harmful substances, is facing opposition from industry groups. The core of the dispute centers on who will bear the financial burden of implementing this upgrade to wastewater treatment plants. Industry representatives argue against covering the primary costs, raising concerns about potential financial repercussions. Experts suggest these costs could ultimately be passed on to consumers. The debate has now escalated to the European Parliament, signaling a potential regulatory shift. The new purification stage aims to improve water quality by removing increasingly prevalent pollutants. The outcome of this debate will likely set a precedent for environmental regulations and industry responsibility across the EU.