Record Low Danube and Drought Threaten Southeast Europe’s Agriculture

Soil moisture across the region is now estimated to be 30–50 per cent below its long-term average, weakening winter crop establishment and forcing farmers to alter sowing schedules. But climate alone does not explain the scale of the disruption. The drought is colliding with ageing water networks, limited irrigation coverage and weak capacity to manage water shortages. What might once have been a difficult agricultural season is becoming a test of infrastructure.

But climate alone does not explain the scale of the disruption.

The drought is colliding with ageing water networks, limited irrigation coverage and weak capacity to manage water shortages. What might once have been a difficult agricultural season is becoming a test of infrastructure.

The Danube's low water is more than a river problem

For Romania, the July drop in the Danube has turned a hydrological problem into a direct agricultural constraint. Irrigation channels in southern and eastern parts of the country depend heavily on the river, and some have been deprived of the water they need precisely when crops are most exposed to heat and rainfall shortages.

The affected areas include Arad, Bacău, Buzău, Vrancea, Călărași and Teleorman, as well as other southern and eastern regions along the Danube.

The wider water system was already under pressure. Only about 57 per cent of Romania's population is connected to centralised water supplies, one of the lowest rates in the EU, while roughly 23 per cent of treated water is lost through distribution networks. Agricultural run-off, including fertilisers and pesticides, is also degrading water quality.

That leaves little margin for error. Modernising irrigation infrastructure is expensive, while the allocation of resources has not been efficient enough to accelerate the necessary upgrades.

The Danube's low level therefore matters not simply because less water is flowing through one of Europe's major rivers. It reveals the dependence of surrounding agricultural economies on infrastructure that was not built for prolonged and increasingly difficult water stress.

Serbia has an irrigation system that often cannot deliver

Serbia illustrates an even sharper version of the infrastructure paradox.

Only 1.4 per cent of the country's agricultural land has access to irrigation. That figure would be troubling under any circumstances; during a prolonged drought, it becomes a major economic vulnerability.

The state allocated more than €58mn to irrigation between 2021 and 2024, yet much of the infrastructure remains non-functional. The gap between money committed and water actually reaching farms is consequently becoming one of the central questions raised by the crisis.

The problem is particularly visible because Serbian agriculture is already absorbing substantial production losses. Wheat yields fell from 8 tonnes per hectare to 4 tonnes per hectare in 2025. In dry years, maize yields have fallen by 20–50 per cent. Eastern Serbia has recorded average crop losses of up to 40.9 per cent in drought years, while the middle Danube region has been particularly exposed to losses in maize and soya.

In Vojvodina, spring drought in 2026 damaged wheat and barley. In the mountainous south-east, including the areas around Niš and the Pčinja district, the 2025 heat caused livestock deaths and losses of grain and feed crops.

For farmers, lower production is only half the problem. Purchase prices for grain have remained around levels seen a decade ago, meaning that falling yields are not necessarily compensated by higher returns. Smaller farms are consequently more exposed to financial distress.

The Serbian case raises a question that goes beyond drought policy: what is the value of infrastructure investment if systems cannot function when they are most needed?

Bulgaria has moved from drought to a public water problem

Bulgaria's experience shows how quickly agricultural water stress can become a problem for households.

About 97 per cent of the country was affected by drought in 2025. From June to September, around 500,000 people - roughly 8 per cent of the population - experienced problems with drinking-water supplies.

The agricultural consequences were severe. Sunflower and maize harvests were expected to fall to their lowest levels in decades, while winter drought reduced the resilience of wheat and barley. Northern Bulgaria, particularly along the Danube, has been hit by the combined effects of summer drought on maize and winter drought on wheat and barley.

Northern, north-western and southern areas are especially vulnerable because functional irrigation is limited.

Here too, ageing networks are only part of the story. The crisis has exposed weak institutional capacity to respond rapidly when water becomes scarce. Repairing infrastructure is therefore necessary but not sufficient. The countries also need systems capable of deciding where water should go, when supplies should be redirected and how competing agricultural and municipal demands should be balanced.

The cost is moving through the food chain

The most immediate losers are farmers, particularly small producers with limited financial capacity and little access to irrigation. But the consequences do not stop at the farm gate.

Across the three countries, grain yields have fallen by roughly 10-40 per cent, with losses reaching 50 per cent in some regions and years. The effects vary by crop and location, but maize, wheat and barley are repeatedly exposed.

Romania and Bulgaria also face a broader economic risk. Lower harvests could weaken their export positions in the Black Sea grain market, where agricultural competitiveness depends heavily on reliable production volumes.

That creates a difficult combination: farmers face declining output while consumers may face price pressure, and exporters have less product available to maintain their market position. There is no single group that absorbs the entire shock.

The pressure is particularly acute where agricultural incomes were already fragile. If drought becomes recurrent rather than exceptional, a sequence of poor harvests could push more small farms towards insolvency and weaken rural communities that have few alternatives to agriculture.

Adaptation is becoming an infrastructure question

Some measures can be introduced relatively quickly. Drip irrigation, soil-moisture sensors, mulching, minimum tillage and cover crops can reduce the amount of water required to maintain production. Farmers can also shift away from water-intensive crops such as maize and lucerne towards more drought-tolerant alternatives including sorghum, millet, legumes and winter cereals.

Those changes, however, depend on farmers having the money and technical capacity to make them.

The larger challenge lies further upstream. Romania needs modernised irrigation networks and functioning Danube channels. Serbia needs to restore irrigation systems that have remained unusable despite substantial investment. Bulgaria needs greater capacity to collect and store water while repairing municipal and agricultural networks.

Longer-term measures are more demanding still: reservoirs for rain and floodwater, restoration of wetlands and shelterbelts, reuse of treated wastewater, agroforestry and regional systems capable of reallocating water between areas during drought.

The fiscal constraint makes the choice harder. Governments cannot simply build their way out of every climate risk. Co-investment in landscape projects, climate-risk monitoring, affordable crop insurance and accessible credit for smaller farms are among the mechanisms that could spread the cost of adaptation.

The political difficulty is that much of this investment produces its greatest value before a crisis becomes visible. A functioning irrigation channel, repaired distribution network or water-storage system attracts little attention when reservoirs are full, and harvests are good.

The Danube's record low level has removed that luxury.