Published 04/20/2026
Royal Decree 1085/2024: new water reuse regulation in Spain
A shift in approach to water reuse based on risk management, quality, and adaptation to each use.
The Royal Decree 1085/2024, published on October 22, 2024, replaces the previous Royal Decree 1620/2007 and redefines the regulatory framework for water reuse in Spain.
Beyond a technical update, the new regulation introduces a shift in approach: it moves from a model based on fixed quality parameters to one based on risk management, aligned with Regulation (EU) 2020/741 and a more integrated vision of efficient water resource use.
From quality to risk: the core of the regulation
The main innovation of the decree is the mandatory implementation of the Water Reuse Risk Management Plan (PGRAR), which becomes the central element to ensure the safe use of reclaimed water.
“The new regulation expands water reuse possibilities in Spain, strengthening health, environmental, and risk management criteria for a safer and more efficient use of water resources.”
This approach requires evaluating not only water quality itself, but also real conditions of use, exposure levels, potential environmental impacts, and the control barriers required for each application.
- Health risks: assessment of exposure and control measures.
- Environmental impacts: analysis of the application context and potential effects.
- Use-specific conditions: each application requires different requirements and controls.
- Control barriers: the system must be designed to continuously reduce risk.
In practice, water reuse is no longer just about meeting analytical thresholds—it becomes a managed system, where design, operation, monitoring, and control are tightly connected.
This regulatory shift often raises questions during the technical planning phase.
View frequently asked questions →New quality classification and adaptation to uses
RD 1085/2024 introduces a more detailed classification of reclaimed water quality, with different classes linked to intended use and exposure level.
Quality classes: A+, A, B, C, D
Each class is defined based on factors such as:
- Level of human exposure
- Type of user
- Risk associated with the final use
This allows for a more tailored application in each case, avoiding one-size-fits-all approaches and enabling more coherent technical solutions.
Reinforced controls and responsibilities
The new regulatory framework strengthens traceability and control across the entire reuse chain, clearly defining responsibilities among stakeholders.
- Clear definition of roles: producer, supplier, and end user.
- Stricter monitoring programs: linked to use and quality class.
- Accredited laboratories: analyses must comply with UNE-EN ISO/IEC 17025.
- Continuous monitoring: control becomes an ongoing process.
Increased coordination between stakeholders also raises operational complexity, while reinforcing safety and environmental guarantees.
Expanded and consolidated uses
“The new regulation consolidates and details permitted uses, defining control and quality conditions for safer application across different environments.”
The decree maintains and expands existing uses, introducing greater technical precision depending on the final application.
- Agricultural uses: especially aligned with EU irrigation reuse regulations.
- Urban uses: irrigation, cleaning, and non-potable municipal uses.
- Industrial uses: technical processes compatible with water quality.
- Recreational uses: such as golf courses and sports facilities.
- Environmental uses: recharge and ecosystem support applications.
Direct human consumption remains strictly prohibited, along with uses where health risks cannot be properly controlled.
A more demanding and technical framework
RD 1085/2024 not only expands reuse opportunities, but also raises the level of technical and documentation requirements.
- Preventive approach: anticipating risk rather than reacting.
- Technical justification: each use must be evaluated and documented.
- Higher specialization: requiring technical expertise and system understanding.
Reuse becomes a strategic technical decision, directly impacting system design, safety, and operation.
Implications for the sector
This framework creates both opportunity and complexity.
Opportunity
- Drives new reuse projects
- Optimizes water resources
- Supports sustainability goals
Technical complexity
- More documentation
- Risk analysis required
- Multiple stakeholders involved
From regulation to solution
Applying RD 1085/2024 requires a full technical approach:
- Resource analysis
- Use evaluation
- Treatment design
- PGRAR integration
This is where reuse becomes a strategic decision rather than a compliance step.
Envirotecnics solutions
At Envirotecnics, we approach each project from a technical perspective, adapting solutions to the resource, use, and regulatory requirements.
“Water reuse solutions help optimize resources, reduce consumption, and move toward more sustainable models.”
Our approach includes:
- Resource analysis
- Custom system design
- Technology integration
- Implementation
- Technical support
Do you have questions about how to apply this regulation to your project?
We have compiled some of the most common questions about water reuse, regulatory requirements, and application criteria to help you better understand how this framework may affect your project.
View frequently asked questions →