Drought restrictions · Industry · Spain
On 1 February 2024, Catalonia declared a drought emergency after reservoirs fell below 16% of capacity. Industry was ordered to cut water use by 25%. Agriculture lost 80% of its allocation. New water-intensive activities were frozen entirely.
This page explains how Spain's drought restriction system works, basin by basin, and which water the restrictions never touch.
Baells reservoir, February 2024
On 1 February 2024, Catalonia declared a drought emergency after reservoirs fell below 16% of capacity, freezing new water-intensive activity across the region. It capped a multi-year drought that had already produced Spain's largest-ever agricultural insurance claim in 2023, and by 2024 the country was in its fourth consecutive year above €700 million in weather-related farm losses.
16%
Reservoir level that triggered the emergency declaration
25%
Mandatory cut in industrial water consumption
80%
Mandatory cut in irrigation allocations
Sources: Pla especial de sequera (Acuerdo GOV/1/2020), emergency declaration of 1 Feb 2024, DOGC. And Catalonia is one basin among nine that can do this.
Each bar is one year of Spain's climate since 1950. Bars rising above the line mean more of the country's climate zones were in drought that year, the darker the red, the worse it got. Bars dipping below the line mean wetter-than-normal years. Look at the last two decades: the reds keep climbing and the blues are thinning out.
Data: Espín Sánchez & Olcina Cantos, 2025, MDPIWater stress is not an episode to wait out. It is the operating baseline for industry in Spain.
2008
Barcelona spent €44 million bringing drinking water in by tanker vessel from Tarragona and Marseille. A European city importing water by ship.
CS Monitor
2021
The system looked stable again: 63% of supply from rivers, 34% from wells, 3% from desalination.
Aigües de Barcelona via AP
Nov 2023
Nine million people, roughly one-fifth of Spain's population, were under some form of water restriction nationally, with the Comunitat Valenciana a major contributor.
Real Instituto Elcano2024
The worst drought since records began in 1916, after three years of rainfall deficit. Emergency for six million people. Desalinated and regenerated water covered over half of supply, with Europe's largest desalination plant (200,000 m³/day) running flat out. Industry cut 25%, agriculture 80%.
DOGC, AP, ACA
Mar 2024
The CHJ (Júcar basin authority) formally declared an "exceptional drought" situation across the Comunitat Valenciana after the driest 33-year period on record (115mm of rainfall vs. a 216mm average). Three systems, Palancia-Los Valles, Cenia-Maestrazgo, and Marina Alta, approached emergency status.
javeamigos.com, CHJ declaration2026
Regulation moved from restricting water to mandating its reuse: Barcelona's ordinance requires greywater reuse systems in new and rehabilitated buildings, with Almería and parts of Ibiza applying equivalent rules and more municipalities drafting theirs.
Eighteen years, and the same lesson each time: supply cannot be guaranteed, so regulation is shifting the burden on-site.
Restrictions are not improvised. Every basin authority operates a pre-approved Special Drought Plan with objective triggers: reservoir levels, river flows, aquifer levels. When an indicator crosses a threshold, the corresponding measures activate.
Normality
Indicators within normal range
No measures. The only stage where a reuse project can be planned without pressure.
Pre-alert
Early drought indicators
Voluntary savings, intensified metering and abstraction control. The last comfortable window: a project started here is running before emergency hits.
Alert
Drought confirmed
Mandatory measures begin. Reduced concession allocations, limits on new abstractions, tighter discharge scrutiny (less river flow, less dilution).
Emergency
Critical indicators (e.g. Catalonia reservoirs <16%)
Catalonia 2024: 25% industry, 50% livestock, 80% irrigation, fines to €150,000, plus a moratorium on new water-intensive economic activities: no new industries, no farm expansions, no new tourism projects requiring intensive water use.
Scenario names vary slightly by basin. The structure does not.
Most drought coverage talks about city taps. If your plant abstracts directly, from a well or a river concession, the mechanism that hits you differs by basin. Three examples, from three basins, all in 2024:
ACA governs only Catalonia's internal basins (Ter-Llobregat), not the Ebro. In 2024, while these reservoirs fell below 16% and Barcelona declared emergency, the Ebro basin, same region, different authority, sat at roughly 70% capacity. Where ACA does apply, cuts are explicit and public: 25% for industry, 80% for irrigation, printed in the DOGC, enforced with documented compliance and fines. You know what's coming, and so does the press.
No headline percentage, no DOGC decree. In March 2024, the CHJ declared extraordinary drought across the entire Júcar basin after the driest 33-year period on record (115mm of rain against a 216mm average). The legal basis is Article 58 of the Ley de Aguas: the authority can act on the public water domain "even where it has been the object of a concession." Cuts are decided system by system, in closed Comisión de Desembalse meetings, not in the press, the Turia system took a 15% restriction while still officially only in pre-alert. Your restriction, if it comes, arrives as a resolution for your specific system, not a headline.
August 2024: extraordinary drought declared, cutting concession rights 49% for non-traditional irrigation and 35% for traditional. October 2024: a 25% annual cut to every registered surface and groundwater abstraction not destined for urban supply in the Margen Derecha unit, industrial intakes included, by BOE resolution. A year later, reduced cuts of 33.5% and 22.5% were still in force, even after the formal drought status had ended.
Physical drought converts into operating cuts. All of these happened, in Spain, recently:
When restricted plants scramble to fill the gap, tanker water typically costs 5 to 15 times mains price. The relevant math is yours alone: your invoiced cost per m³ abstracted, treated and discharged, against the cost of a 25% hole in supply.
Two-thirds
of the global population (4 billion people) experience severe water scarcity at least one month a year
Mekonnen & Hoekstra, Science Advances (2016)
Sicily, Italy — 2024
Sicily declared a regional state of water emergency in February 2024. Reservoirs reached "extreme" drought status, the highest level tracked by Italy's environmental protection institute (ISPRA), and residents in Agrigento and neighboring provinces depended on paid water tankers for months.
CNNMonterrey, Mexico — 2022
The Cerro Prieto reservoir, one of three supplying Mexico's industrial hub of Monterrey, dropped to 0.5% of capacity in July 2022 and stopped supplying water entirely, the first time since the dam opened in 1984. Authorities redirected industrial and agricultural allotments to residential supply.
NASA Earth ObservatoryChennai, India — 2019
On 19 June 2019, Chennai officials declared "Day Zero": all four reservoirs supplying the city had run completely dry. Eleven million people went without piped drinking water for months, relying on tankers and public pumps.
World Resources InstituteSpain came close. In February 2024, the Spanish and Catalan governments finalized a contingency to ship desalinated water by tanker from the port of Sagunto, near Valencia, capable of moving up to 25,000 m³ a day into Barcelona. Spring rains and a floating desalination plant meant it was never activated, but we got close.
A 25% cut in an optimized plant cannot be met by closing bathroom taps. It comes out of the process, or out of production.
Basin authorities can act on the public water domain regardless of concessions. When restrictions hit, agriculture is cut first and hardest, industry follows with large but smaller cuts, and urban supply is protected last of all. In the Segura, the October 2024 resolution cut registered rights 25% for every non-urban abstraction, industrial included.
"...even where it has been the object of a concession."
Drought rules limit network supply and abstractions. Regenerated water is repeatedly carved out as the permitted alternative: under Catalonia's 2024 emergency, irrigation for tree survival was allowed only "with regenerated or groundwater", and Decret llei 4/2024 built similar carve-outs for other uses. Internal recirculation reduces the very consumption the cuts are computed on. Check your basin's current text, but the direction is consistent: the more of your demand runs on regenerated water, the less of it a decree can reach.
Sectors
Find solutions for your site
Whether industrial wastewater, process water or greywater, Caskade can help you find the optimal treatment or reuse solution for your water to save on costs and protect you against restrictions and regulations.
The rules below are real and cited. These two paths through them are illustrative scenarios based on the 2024 emergency rules, because no plant publishes this story about itself:
A mains-supplied dyehouse with no reuse loop receives its documented 25% reduction obligation in February 2024. Its options that week: cut shifts, truck in water at 5 to 15 times mains price, or sign with the first vendor who answers. It rents temporary treatment at urgency rates and spends spring proving compliance. When the rains come in May and the emergency lifts, nothing permanent remains.
A comparable plant commissions a reuse evaluation while the basin is still in pre-alert. By the time emergency is declared, a membrane loop covers roughly half of process demand with regenerated water, the carved-out category. The mandatory 25% applies to a mains intake already halved. Compliance is a letter, not a crisis. And the emergency moratorium on new water-intensive activities does not bite, because the plant's expansion request is framed around reduced net consumption.
Same regulation, same drought. The difference is eighteen months of lead time.
Treating water you don't need to consume in the first place is the cheapest fix there is, but efficiency alone doesn't survive a mandatory 25% cut. The lever that does: treat your own process effluent back to reusable quality and put it to work on-site.
Internal recirculation to the same process needs no reuse authorization at all under RD 1085/2024. Other on-site uses, rinsing, cooling, sanitary, require the regulation's quality standards and a risk management plan (PGRAR): a defined procedure, not a barrier.
A plant covering 40 to 60% of demand with regenerated water turns a mandatory 25% cut into an absorbable event. Often into a non-event.
You're not a water engineer, and you shouldn't have to be: there are 500+ specialised water treatment & reuse vendors. Every one recommends their own technology.
Caskade is the only platform where 30+ specialist manufacturers compete for your project in industry or hospitality.
FAQ
Does a water concession protect my plant from cuts?
No. Article 58 of the Ley de Aguas lets basin authorities adopt measures over the public water domain "even where it has been the object of a concession." In the Segura basin, the October 2024 resolution cut registered rights 25% for every non-urban abstraction, industrial included.
Does regenerated water count against my restriction target?
No, and that's the point. Drought rules limit network supply and abstraction, not internal reuse. Under RD 1085/2024, water recirculated within the same process needs no reuse authorization at all. The more of your demand runs on regenerated water, the less a decree can reach.
How long does a reuse project take to get running?
Six to eighteen months from evaluation to operation, depending on scope and permitting. That's longer than the time it took Catalonia's reservoirs to go from pre-alert to emergency in 2024, which is why pre-alert, not emergency, is the moment to start.
What happens if I do nothing and my basin declares emergency?
You get a documented reduction target with a short compliance window, and the only remaining options are cutting production, trucking in water at 5 to 15 times mains price, or contracting whichever vendor answers first. Temporary measures dominate compliance under those constraints, and most of the spend delivers no lasting infrastructure once the emergency lifts.
Is Catalonia the only region with this exposure?
No. Catalonia's ACA publishes explicit percentage cuts, but the Júcar (CHJ) and Segura (CHS) basins impose comparable or larger reductions through concession-level resolutions that rarely make the news. If your plant abstracts directly from a river or well anywhere in Spain, the mechanism that reaches you depends on your basin, not just your region's headlines.
