Industrial laundries and textile finishing plants
Technical guide · Updated June 2026
Can you reuse wastewater at your Spanish industrial site? A plain guide to RD 1085/2024
If you treat water at your plant in Spain and want to put it to a second use, one question determines whether you need a permit: does the treated water return to the same process, or does it go somewhere else?
If it returns to the same process, you sit outside the regulation and need no authorisation on that basis. If it goes anywhere else (floor washing, site irrigation, a separate process line, a cooling circuit), it becomes reclaimed water (agua regenerada) and you need two permits and a documented risk plan before you start.
This guide tells you where the line is, what the permits involve, what the deadlines are, and how the right treatment route is chosen once scope is confirmed. It is vendor-neutral: no manufacturer relationship shapes the assessment or the recommendation.
Key facts: RD 1085/2024
| In force | 24 October 2024 |
|---|---|
| Replaces | RD 1620/2007 |
| Authorised uses | 28 across 4 groups (urban, agricultural, industrial, other) |
| Core document | Plan de Gestión del Riesgo del Agua Regenerada (PGRAR) |
| Main deadline | 31 December 2028 (existing non-agricultural sites) |
| APS permit validity | 10 years, renewable up to 3 times |
| APS resolution time | Up to 12 months; no response = negative |
| Spain's current reuse volume | ~400 hm³/year (est. 15% of potential, MITECO 2022/27 data) |
Who should read this
This guide is written for plant directors, environmental managers, and facility operators at sites that treat or discharge water in Spain. It applies most directly to:
Tanneries and leather processors
Food and beverage manufacturers, breweries, and wineries
Meat processors and slaughterhouses
Chemical and paper manufacturers
Hotels, resorts, and campsites
.avif)
Industrial estates and multi-tenant parks sharing wastewater infrastructure
If you are an engineering firm or ESCO advising one of these clients, the scope test and permit structure sections apply directly to the sites you manage.
Do you need a permit? The scope test
Scope is determined by the destination of the treated water, not by who treats it.
The regulation turns on one question: where does the treated water go next?
Out of scope, internal recirculation: You treat water and return it to the same process or loop it came from. RD 1085/2024 explicitly excludes this. A wash stage that filters and recirculates its own water, a rinse loop that retreats the same rinse water, a process tank with a polishing step that feeds directly back to the same tank: none of these need a reuse authorisation on this basis.
In scope, reuse: The moment treated water goes to a different use, it becomes reclaimed water. Floor washing, site irrigation, a cooling circuit that did not generate the water, a second process line. You need the permits, the quality class for that use, and a risk plan.
The trap most plants fall into is assuming that running their own wastewater treatment plant puts them outside the regulation. It does not. Scope is set by where the output water goes, not by who treats it. A paper mill that treats its own effluent and uses the treated output for boiler makeup is in scope if that makeup circuit is a different use from the process that generated the effluent.
For most industrial configurations the recirculation/reuse distinction is straightforward. Some cases are not: cascaded reuse across multiple production lines, centralised treatment serving several processes, or shared WWTP arrangements on industrial estates can be ambiguous. The Spanish Ministry (MITECO) has published nine annotated case diagrams, including industrial estate and multi-tenant scenarios, covering the most common configurations. Review them before committing to system design in any non-obvious arrangement. MITECO RD 1085/2024 FAQ
Not sure whether your site is in scope? Send us a process flow diagram and a recent water bill. We will tell you where the regulation applies before you spend anything on design. Free project review
What changed from RD 1620/2007
This is a structural change, not a parameter update. Sites that operated without formalised documentation under the old regulation need to formalise. Sites designing new reuse must build to the new standard from day one.
| RD 1620/2007 (derogated) | RD 1085/2024 (in force) | |
|---|---|---|
| Framework | Fixed quality limits by use type | Risk-based management (PGRAR per installation) |
| Uses covered | 5 broad categories | 28 specific uses across 4 groups |
| Recirculation scope | Not addressed | Explicitly excluded |
| Continuous monitoring | Not required | Mandatory turbidity monitoring for sensitive uses |
| Lab accreditation | Not specified | ISO/IEC 17025 mandatory |
| Permit structure | Single authorisation | Separate APS (production) + CRA (use) |
| Legionella | Not integrated | Explicit overlap with RD 487/2022 for aerosol uses |
| Adaptation deadline | Not applicable | 31 December 2028 for existing non-agricultural sites |
The context: the previous regulation delivered approximately 400 hm³/year of actual reuse according to MITECO hydrological plan data (2022/27 cycle), around 15% of Spain's estimated reutilisation potential (source: La economía circular y el sector del agua en España, 2023). The new framework, with binding risk plans and continuous monitoring requirements, is designed to push that figure significantly higher. Enforcement pressure will follow.
The three permits you need, and how they connect
Basin authority resolves APS in up to 12 months. No response means a negative decision.
Production and supply authorisation (APS)
Held by whoever operates the regeneration step, the treatment that brings water to reuse quality. Applied for at the river basin authority (organismo de cuenca). Based on the PGRAR. Runs for ten years, renewable for up to three further equal periods. Legal entities must apply electronically. The basin authority has a maximum of 12 months to resolve; no response within that window is a negative decision. There is no automatic grant.
Reuse concession (CRA)
Held by the user of the reclaimed water. Assessed against the basin's hydrological plan, including the downstream effect of taking water out of the discharge flow. On industrial sites where you produce and use the water yourself (the common case), the APS and CRA can be processed together as a single application. If you already hold a water concession from the same basin authority, the standard approach is to modify it rather than start a new application from scratch.
Risk management plan (PGRAR)
The technical core of the APS. The PGRAR identifies every hazard across production, supply, and use; defines the barriers and controls that keep risks acceptable; sets the monitoring parameters, frequencies, and analytical methods; and specifies the corrective action chain for deviations. No PGRAR, no APS. Once granted, the PGRAR becomes the day-to-day operating reference: volumes, quality readings, alarms, and incidents go into a digital record that demonstrates continuous compliance, not just point-in-time sampling.
A well-designed PGRAR can also reduce long-run monitoring cost. Where a system demonstrates sustained operation well within its limits, the regulation allows a motivated request to reduce analytical frequency, subject to approval from the basin authority and the health authority. Factor this into the operational cost model from the start.
Which uses are permitted, and which are excluded
The 28 authorised uses fall into four groups:
Urban
Agricultural
Industrial
Other / Environment
Each use maps to a quality class in Annex I, which sets the microbiological and chemical thresholds, monitoring parameters, and minimum control frequencies. Confirm the permitted use and its class against the current Annex I text before designing any treatment system.
Industrial uses permitted
Subject to correct quality class
- Process water that does not contact food
- Cooling water in closed circuits
- Cleaning of facilities and equipment
- Irrigation of green areas within the industrial site, not accessible to the public
- Other uses specified in Annex I for industrial groups
Uses that are excluded
Human consumption is excluded entirely. Most food-industry contact uses are excluded, with only narrow exceptions for specific processing and cleaning steps defined in Annex I. Assume the use is excluded until confirmed otherwise; the cost of getting this wrong after hardware is procured is high.
Cooling towers and spray systems that generate aerosols are permitted under specific quality conditions, but they trigger the Legionella regime under RD 487/2022 in parallel. This adds in-situ readings of pH, temperature, conductivity, and disinfectant residual to every sampling event, plus a separate Legionella spp. culture schedule. Budget the additional monitoring cost before committing to a cooling tower application.
The deadlines: what happens when
New projects: no grace period. Permit required before operation.
| Date | What it means for your site |
|---|---|
| 24 October 2024 | RD 1085/2024 in force; RD 1620/2007 replaced |
| 31 December 2025 | Operators submit reuse volume data to the Observatorio de Gestión del Agua |
| New projects, now | Authorisation and concession must be in place before the reuse activity begins. No grace period. |
| 26 June 2026 | Spain submits updated reuse status report to the European Commission |
| 31 December 2028 | Existing non-agricultural facilities with a current permit must meet Annex I quality standards |
The date that matters for a new project is not 2028. It is the lead time from starting the assessment to holding a signed authorisation: water characterisation, treatment route selection, PGRAR drafting, hydrological plan compatibility check, APS submission, and up to 12 months for the basin authority to resolve. Sites that begin this process in late 2026 may find the 2028 window tight.
Day-to-day compliance: what the monitoring requires
Quality must be demonstrated continuously, not just on sampling day. The exact parameters, thresholds, and frequencies depend on the quality class your use requires and are specified in your PGRAR. The urban quality classes show the clearest pattern:
| Parameter | How it is checked | Higher quality class | Lower quality class |
|---|---|---|---|
| Flow | Continuous, on the line | Always | Always |
| Turbidity | Continuous (short rolling mean) | Tight numeric limit | Looser or per urban wastewater rules |
| E. coli | Accredited lab | Stricter limit, more frequently | Looser limit, monthly |
| Suspended solids | Accredited lab | Stricter limit, more frequently | Per urban wastewater rules |
| Somatic coliphages | Accredited lab | Required as virus indicator | Not required |
Labs must hold ISO/IEC 17025 accreditation and must use the prescribed analytical methods for each parameter. There is no path to self-certification. For aerosol-generating uses, the Legionella monitoring under RD 487/2022 adds in-situ readings of pH, temperature, conductivity, and disinfectant residual to every sampling event.
Which sectors have the strongest case for water reuse in Spain
High-volume, high-COD, high-salinity effluent is common in finishing plants. Many sites already have partial treatment that brings effluent near industrial reuse quality classes but without formalised permits. The December 2026 BAT conclusions compliance deadline (Implementing Decision 2022/2508) runs simultaneously, meaning the discharge compliance question and the water reuse question converge on the same plant upgrade investment. Where basin tariffs are rising, each cubic metre recovered improves payback year on year.
Water is the primary input and a major variable cost. A site processing 10 tonnes of linen per day at 10 m³ per tonne carries significant water and effluent cost in its operating budget. Recirculation of rinse water within the same rinse stage stays outside RD 1085/2024 scope. Routing treated effluent to a pre-wash stage on a separate line brings it in scope. The distinction between those two configurations is the starting analysis for any laundry operator considering water reuse. See the industrial laundries segment guide.
Hotels, resorts and campsites
Hotels, resorts and campsites
Hospitality sites consume significant volumes for landscaping, toilet flushing, laundry, and cleaning, all uses that Annex I covers under defined quality classes. The reuse business case often closes faster than in heavy industry because the water cost is visible on a single bill and treatment volumes are manageable. Where sites rely on tanker removal for effluent disposal, eliminating that cost can add a second ROI line alongside the water tariff saving. Confirm that your specific uses (irrigation, toilet flushing, cleaning) appear in Annex I for the relevant quality class before designing a system.
Tanneries and leather processing
Tanneries and leather processing
Chrome-containing, sulfide-rich effluent is typical. Chrome recovery processes produce an effluent that, if directed to any use outside the chrome process itself, becomes reclaimed water requiring an APS and CRA. IED 2.0 transposition will tighten integrated permit conditions at the next review cycle, potentially pushing chrome discharge limits lower on direct discharge. Water reuse and discharge compliance are converging on the same investment decision.
Food and beverage
Food and beverage
The Annex I exclusions matter most for this sector. Many food-industry applications that operators assume are permitted are excluded. The useful analysis is identifying which non-contact uses (facility cleaning, site irrigation, process cooling without aerosol risk) actually qualify, sizing the treatment and permit cost against the water bill, and confirming before any hardware is specified.
Industrial estates and multi-tenant parks
Industrial estates and multi-tenant parks
Where a central WWTP serves multiple tenants, the production and supply authorisation attaches to the entity operating the regeneration step, which may be the estate operator rather than any individual tenant. If reclaimed water is then distributed to tenants for different uses, each tenant may need its own reuse concession. The MITECO case diagrams cover shared-WWTP and multi-tenant scenarios explicitly. Confirm the permit ownership structure before assuming it mirrors a single-company installation.
Regional drivers at a glance
| Region | Primary drivers for water reuse |
|---|---|
| Catalonia |
|
| Valencia |
|
| Murcia |
|
| Andalusia |
|
| Balearic Islands |
|
| Route | Annex I classes | Typical capex | Energy | Footprint | Compliance complexity |
|---|---|---|---|---|---|
| Advanced biological + filtration + UV | Lower industrial | Lower | Moderate | Medium | Lower |
| Ultrafiltration + UV/ozone | Mid to high industrial | Moderate | Moderate | Compact | Moderate |
| Reverse osmosis + polishing | Strictest classes | Higher | Higher | Larger | Higher |
| MBR (membrane bioreactor) | Mid to high industrial | Moderate | Higher | Compact | Moderate |
Ranges vary with effluent quality and site conditions. Caskade models your specific configuration.
Choosing the right treatment technology, and why it matters as much as the permit
RD 1085/2024 sets the quality class. It is silent on how you reach it. That gap is where ten-year project cost is won or lost.
The same Annex I class can be met by very different trains: biological treatment with filtration and UV, ultrafiltration plus disinfection, or reverse osmosis and polishing. Capital cost, energy, footprint, and maintenance can diverge sharply for the same quality target.
The intended use shapes compliance overhead as much as the technology. Cooling towers trigger Legionella monitoring under RD 487/2022; irrigation uses carry different sampling cadences than closed process circuits. Factor the PGRAR burden into route selection, not just capex.
A single manufacturer cannot answer this without bias. We compare routes vendor-neutrally against your effluent data, target use, space, and current water and discharge invoices, with payback anchored to your bills.
The short version
If treated water leaves its original process, you need two permits and a risk plan. The quality class and treatment route depend on what you do with it. The right route, chosen before hardware is bought, typically avoids the most expensive compliance mistakes.
How Caskade helps
Send us your site's basic details, the intended use for the water, and a recent water bill. We come back with:
- Whether you are in scope under RD 1085/2024
- The quality class your use requires under Annex I
- The treatment routes worth shortlisting, with capital cost ranges and payback estimates against your invoices
- A plain account of what the PGRAR and authorisation path involves, and roughly what it costs, before you commit to any hardware
No obligation. No preferred brand.
Free Project ReviewFAQ
Frequently asked questions
Can I reuse wastewater at my factory in Spain without a permit?
Only if the water returns to the same process that generated it (internal recirculation), which RD 1085/2024 explicitly excludes from its scope. Any other reuse, directing treated water to a different use on the same site or off it, requires a production and supply authorisation (APS), a reuse concession (CRA), and a risk management plan (PGRAR) in place before the activity begins. Operating without them is an unauthorised use of the public water domain.
Does RD 1085/2024 apply if I recirculate water within the same process?
No. The regulation explicitly excludes internal recirculation. Water treated and returned to the process that generated it does not need an authorisation under RD 1085/2024. The definition of reclaimed water requires the water to be directed to a use different from the one that generated it. A wash stage that filters and returns its own water to the same wash stage, or a process loop with a polishing step feeding directly back to the same loop, is recirculation and sits outside scope.
My site treats its own wastewater. Does that make the treated output reclaimed water automatically?
No. Scope depends on where the treated water goes, not who treated it. A site operating its own treatment plant and returning the output to the same process remains outside RD 1085/2024. The moment that treated water is directed to a different use, even another line on the same site, it becomes reclaimed water and the regulation applies in full.
What is a PGRAR and who is responsible for it?
PGRAR stands for Plan de Gestión del Riesgo del Agua Regenerada. It is the risk management plan that forms the technical basis for the production and supply authorisation (APS). It identifies hazards across the production, supply, and use chain; defines the barriers and controls that keep risks acceptable; specifies monitoring parameters, frequencies, and analytical methods; and sets the corrective action protocol for deviations. Once the APS is granted, the PGRAR becomes the ongoing operating reference: volumes, quality results, alarms, and incidents go into a digital record. Responsibility sits with the APS holder, typically the site operator. External consultants usually draft it, but the operator is accountable for its accuracy and ongoing compliance.
Can I reuse treated wastewater in cooling towers in Spain?
Yes, subject to the quality class specified in Annex I for that use. However, any application generating aerosols (cooling towers, misting systems, spray applications) triggers the Legionella management regime under RD 487/2022 in parallel, adding in-situ monitoring of pH, temperature, conductivity, and disinfectant residual to every sampling event, plus a separate Legionella spp. culture schedule. Factor both the quality requirements and the monitoring overhead into the project cost before committing to a cooling tower application.
Can reclaimed water be used in food industry processes in Spain?
Only in specific, narrowly defined circumstances. Most food-contact uses are excluded under RD 1085/2024. Some non-contact cleaning and processing steps may qualify under the appropriate Annex I quality class, but this must be confirmed against the current Annex I text before any system is designed. For food-industry applications, assume the use is excluded until confirmed otherwise.
How long does the production and supply authorisation (APS) last?
Ten years, renewable for up to three further equal periods, a maximum total of 40 years of continuous authorisation. Applications by legal entities must be submitted electronically. The basin authority has up to 12 months to resolve. No response within that window is a negative decision. The application must include a description of the proposed system, the PGRAR, geographic coordinates of the reclaimed water delivery points, and the self-monitoring programme.
I already hold a water concession. Do I need a new one to start reusing reclaimed water?
Generally not. Where you hold a concession for natural water abstraction and want to substitute some or all of that volume with reclaimed water from your own treatment, the standard approach is to modify the existing concession rather than apply for a new one. The specifics depend on your existing concession terms and your basin authority's process. Confirm before initiating paperwork. Applying for a new concession unnecessarily prolongs the timeline.
What does the 31 December 2028 deadline actually require?
It applies to existing non-agricultural production and supply facilities that already hold a permit under the old RD 1620/2007. By that date, those installations must meet the Annex I quality standards of RD 1085/2024. New projects do not benefit from this transition: permits must be in place before operation begins, and there is no grace period for new starts.
Does RD 1085/2024 require monitoring for pharmaceuticals or emerging contaminants?
The regulation requires the PGRAR to assess risks from emerging contaminants, including pharmaceuticals, hormones, and industrial chemical residues, based on the specific water source and intended use. There are no universal fixed limits for most emerging contaminants in the current Annex I. In practice, the PGRAR must document why a given contaminant is or is not a material risk for the system, and if it is, what the control barrier is. For uses where emerging contaminants are a realistic concern, particularly where the source is municipal WWTP effluent used near food or with public contact, expect both the basin authority and the health authority to scrutinise this section during APS review.
How much does a water reuse project typically cost in Spain?
Total cost depends on scale, effluent quality, intended use, and the treatment route chosen. As rough orientation for industrial SME projects: feasibility study and PGRAR preparation typically run €8,000 to €25,000 depending on complexity; permitting support (technical preparation for APS/CRA submissions) €5,000 to €15,000 in addition to administrative fees, which are typically low; treatment installation €50,000 to €500,000 or more for most SME industrial cases, depending on flow volume, the quality class required, and whether partial treatment already exists on site; ongoing monitoring and accredited lab analysis €5,000 to €20,000 per year depending on quality class and sampling frequency. These ranges are wide because effluent complexity and quality class drive cost more than site size alone. We model the specific cost against your water data and invoices before any hardware is committed.
When does water reuse make economic sense?
The case for water reuse is worth analysing seriously when one or more of the following apply: your combined water purchase and effluent discharge cost exceeds roughly €3/m³, the threshold at which most industrial treatment investments reach payback within five to seven years at moderate reuse rates; your site faces seasonal restrictions, drought curtailments, or concession renewal risk on natural water abstraction; you face discharge permit tightening anyway, so treatment investment is coming regardless and reuse recovers value from it; water is a production continuity risk through single-source dependency in a water-stressed basin; your ESG reporting, customer requirements, or financing terms include water intensity targets that reuse directly addresses; or you have tanker removal costs for effluent disposal that reuse can eliminate. The economic case rarely rests on water tariff alone. Discharge savings, tanker elimination, avoided production downtime, and supply security all contribute. We model the full picture against your bills rather than using sector averages.
What happens if I operate a reuse activity without a permit?
Operating without the required APS and CRA is an unauthorised use of the public water domain under the Texto Refundido de la Ley de Aguas. Consequences can include fines, suspension of the activity, and an obligation to restore prior conditions. Under IED 2.0 once transposed, serious environmental breaches carry penalties up to 3% of annual turnover. Beyond the regulatory exposure, an unpermitted system cannot be demonstrated as compliant to clients, insurers, or downstream users of the site.
Related resources
Rising water costs in Catalonia: what the numbers mean for reuse payback
How ACA tariff trends change the reuse business case.
Blog
Industrial laundries: water reuse and treatment options
Scope test, recirculation vs reuse, and route comparison.
Solutions
MITECO official RD 1085/2024 guidance and FAQ (Spanish)
Annotated case diagrams and scope guidance from the ministry.
External
Free site assessment: scope, quality class, treatment route shortlist
Send your site details and water bill for a vendor-neutral review.
Free project reviewSources: RD 1085/2024 (BOE-A-2024-21701); MITECO FAQ on RD 1085/2024 scope (October 2024); Planes Hidrológicos 2022/27 (MITECO); La economía circular y el sector del agua en España (2023); Implementing Decision 2022/2508 (Textiles BAT conclusions); Directive 2024/1785 (IED 2.0).