Bulgaria in 2026: a deepening water crisis, 60% leakage, and Iskar under pressure
More than 260,000 Bulgarians across 16 cities live under formal water rationing, the country has the EU's highest distribution-network leakage at roughly 60%, and the Iskar reservoir that supplies most of Sofia is being closely watched. Here is the data.
Bulgaria is, by underlying water resources, not a poor country: extensive mountain ranges, significant river volume and a long Black Sea coast. The crisis it now faces is primarily an infrastructure and management problem layered onto a climate signal — and the consequences are increasingly visible at street level. This briefing summarises what the public record shows as of May 2026.
The crisis on the ground
More than 260,000 people across at least sixteen cities and hundreds of villages were experiencing formal water rationing as of late 2025, with local authorities implementing strict consumption limits to stretch dwindling supply [1]. Reservoir levels nationally hit roughly 55 % of capacity in 2025, with the situation persisting into 2026.
In Breznik, west of Sofia, a town-level water-rationing regime has been in place since November 2024 [2]. The local drinking-water reservoir has shrunk visibly enough to look "like a puddle," with the reduced volume producing elevated manganese contamination — a real-world example of how scarcity and water-quality risk compound.
The infrastructure problem
Bulgaria's water-distribution network loses roughly 60 % of treated water to leakage — the highest rate in the European Union [2]. There are approximately 900 dams in need of repair across the country, many built in the 1960s–70s, with degraded structural condition reducing reliable storage capacity even in years with adequate rainfall.
The Iskar Reservoir, Bulgaria's largest, provides more than two-thirds of Sofia's drinking water. Its operating envelope is now monitored with increasing frequency in the national press during summer drawdown, with the Maritsa basin (Maritsa, Tundzha, Arda) handling the south and the international Aegean basin.
A climate signal on top of an infrastructure problem
WRI Aqueduct rates large parts of Bulgaria — particularly the south-eastern Tundzha and Arda catchments — at "medium" to "high" baseline stress, with rising projection bands under business-as-usual climate scenarios [3]. The 2024–2025 drought sequence sits on top of these structural drivers and accelerates the timing of investment decisions.
Compared with EU peers, Bulgaria's per-capita renewable water resources are not unusually low; the issue is that roughly half of treated drinking water never reaches consumers, and roughly one in three reservoirs is operationally compromised. That is an investment-and-execution problem more than a hydrological one.
Policy moves and signals to watch in 2026
The Bulgarian Ministry of Regional Development and Public Works and the Ministry of Environment and Water are jointly responsible for the national water policy. Investment programmes targeting leakage reduction, dam rehabilitation and inter-basin connectivity are part of the country's post-2020 national drought response, with EU Cohesion funding the primary lever through 2027.
For real-time signals, the Iskar reservoir level (Sofia supply), the Maritsa basin status (south Bulgaria) and the rationing-list count (the number of municipalities under formal water-limit) are the three most-watched indicators. The European Drought Observatory adds a comparative SPEI lens. The next inflection point is end-of-September: by then the dry-season drawdown rate will signal whether the 2026 buffer holds.