Yes, rainwater collection is legal in Portugal, but compliance hinges on adherence to municipal and national water resource regulations, particularly under the Regulamento Geral dos Sistemas Públicos e Prediais de Distribuição de Água e de Drenagem de Águas Residuais (RGR). While no nationwide ban exists, local authorities enforce restrictions to prevent aquifer depletion and ensure public health safety. The 2026 revision of the Plano Nacional da Água tightens oversight, requiring permits for systems exceeding 10m³ storage in drought-prone regions like Alentejo and Algarve.
Key Regulations for Rainwater Collection in Portugal
- Municipal Permits: Local Câmaras Municipais (e.g., Lisbon’s Regulamento Municipal de Águas Pluviais) may require permits for systems over 5m³, especially in urban areas with combined sewer networks. Non-compliance risks fines up to €3,740 under the Lei da Água (Decreto-Lei n.º 226-A/2007).
- Quality Standards: Collected water must meet Portaria n.º 243/2021 for non-potable use (e.g., irrigation, toilet flushing). Systems must include filtration to prevent contamination, as enforced by ERSAR (Entidade Reguladora dos Serviços de Águas e Resíduos).
- Drought Zones: In Áreas de Risco de Escassez (e.g., Beja, Faro), the Agência Portuguesa do Ambiente (APA) mandates pre-approval for systems over 2m³, aligning with the 2026 Plano de Gestão de Região Hidrográfica. Violations trigger mandatory disconnection.