Researchers conducting annual monitoring on Romania's Vâlsan River counted 150 asprete (Romanichthys valsanicola) fish between 22 and 25 September 2026, down from 181 specimens in 2025, with the conservation programme placing most of the blame on a downstream municipal wastewater treatment plant that it says chronically pollutes the river Romania Insider. The 450-metre core stretch where most of the remaining population is concentrated sits upstream of the Brădetu wastewater treatment plant in Argeș county, the only place in the world where Europe's rarest freshwater fish still survives Romania Insider.
Key takeaways
- 150 asprete counted in 2026, down from 181 in 2025, with 114 of the 2026 total (76%) found in a single 450-metre stretch representing under 5% of the approximately 10 km of river where the species was detected Romania Insider.
- Downstream of the Brădetu wastewater treatment plant, the count fell from 68 to 36 fish year-on-year, accounting for almost the entire decline Romania Insider.
- The Green Belt Foundation says the core population is trapped between a concrete barrier upstream and the Brădetu plant downstream, which it alleges operates outside required parameters Romania Insider.
- Nearly EUR 500,000 from Romania's 2026 state budget has been allocated to restore the Brădetu plant to required operating standards, following discussions with the foundation Romania Insider.
- On 22 September the foundation submitted a five-year LIFE ASPRETE proposal to the European Commission, with the Environment Ministry and the Presidential Administration's Climate and Sustainability Department named as backers Romania Insider.
What happened
The Centura Verde/Green Belt Foundation's Aspretele Trăiește/Asprete Lives programme and its partners ran the September 22–25 survey at 21 monitoring stations, finding the species at nine of them and counting 150 individuals, 181 in 2025 Romania Insider. Within the 450-metre core area the count was 114 in 2026, almost identical to 113 in 2025, but downstream of the Brădetu wastewater treatment plant the figure fell from 68 to 36, which the foundation treats as the signature of a chemical barrier created by chronic non-compliance at the plant Romania Insider. The foundation is now working to remove three artificial barriers near Brădetu, including the upstream concrete structure, through the Open Rivers programme, which would reconnect around 12.8 km of river habitat Romania Insider.
Green Belt Foundation president and programme founder Alex Găvan framed the 2026 results as evidence of a direct link between the plant's operation and the fish's distribution: "The figures now clearly show the connection between the distribution of the asprete and the continued poisoning of the Vâlsan River by the treatment plant, which has failed to operate within the required parameters for many years" Romania Insider. He added: "Without the ecological flow calculated by the National Institute of Hydrology and Water Management, the asprete has no chance. We have a fish that is unique in the world, while the river and the community of the Vâlsan Valley need healing. Beyond preserving a species and an extremely valuable ecosystem, we are talking about an urgent public health issue" Romania Insider.
Funding is moving on two tracks. Nearly EUR 500,000 from Romania's 2026 state budget has been earmarked to restore the Brădetu plant to required operating standards after discussions between the foundation and public authorities Romania Insider. Separately, on 22 September the foundation submitted the LIFE ASPRETE proposal, which if approved by the European Commission would combine annual monitoring with habitat restoration, controlled restocking, and a national action plan, alongside a proposed 1.5-hectare Asprete Sanctuary for research and captive breeding in Galeșu, Brăduleț commune, on land the foundation has acquired Romania Insider. The project also proposes incorporating mandatory ecological flow values, calculated in 2024 by the National Institute of Hydrology and Water Management, into the water-management permits for the Vâlsan dam and Dobroneagu intake Romania Insider.
| Indicator | 2025 | 2026 | Notes |
|---|---|---|---|
| Total asprete counted | 181 | 150 | Survey 22–25 Sept 2026 Romania Insider |
| Fish in 450 m core stretch | 113 | 114 | ~76% of 2026 total Romania Insider |
| Fish downstream of Brădetu WWTP | 68 | 36 | Most of the year-on-year loss Romania Insider |
| Stations where species detected | not reported | 9 of 21 | Romania Insider |
| State budget for Brădetu plant | — | ≈ EUR 500,000 | 2026 allocation Romania Insider |
Specification read
For procurement and utility readers, the directly reported scale is a single municipal asset: the Brădetu wastewater treatment plant on the Vâlsan River, with no design flow in m³/day or population equivalent published in the source. Because that hydraulic and load envelope is not reported, any reader-side sizing exercise has to be done from influent monitoring rather than from the article; what the source does anchor is the compliance frame (a municipal plant allegedly operating outside required parameters and treated as a chemical barrier) and the procurement signal (≈ EUR 500,000 of state-budget capital allocated in 2026 to bring it back to required operating standards).
A municipal plant of this class, treating domestic sewage from the Brăduleț and Mușătești communes where sewerage is reported to be absent, would typically run screening → grit removal → primary clarification → biological treatment (conventional activated sludge, SBR, or MBBR/MBR where flows are small and discharge quality tight) → tertiary polishing and disinfection, with the receiving-water sensitivity on the Vâlsan pushing the design toward tighter ammonia, total nitrogen and phosphorus limits and reliable disinfection. The event in the source bears principally on the biological and disinfection stages, because non-compliant operation at that point is what conservationists link to the downstream collapse in fish counts. Hydropower assets also sit in the same catchment: the foundation says the Vâlsan dam and Dobroneagu water intake are not consistently releasing the ecological flow calculated in 2024 by the National Institute of Hydrology and Water Management, so a buyer scoping upgrades in this valley should expect flow regime, not just effluent quality, to drive permit conditions Romania Insider. If your plant looks like a small municipal works (a few thousand m³/day, low-to-moderate BOD/COD, a Natura 2000 receiving water with mandatory ecological flow), the headline lesson is the same: the bottleneck that cost this catchment roughly half of its downstream asprete count in a single year was not hydraulic capacity but compliance with operating parameters, and the funded response is a process and instrumentation upgrade rather than a new greenfield train. Engineers comparing modular and packaged options for similar small municipal catchments can start with the most reliable modular wastewater treatment systems for 2026 and the municipal sector overview, while the cost side of adding soft-sensor control to a biological stage is laid out in the 2026 soft-sensor cost guide and the municipal treatment hub.
FAQ
What went wrong at the Brădetu wastewater treatment plant?
The Green Belt Foundation alleges the Brădetu plant has chronically failed to operate within the required parameters, releasing pollutants that act as a chemical barrier in the Vâlsan River and reducing the downstream asprete count from 68 to 36 between 2025 and 2026 Romania Insider. No permit IDs, effluent values or enforcement actions are reported in the source.
How much money has been allocated to fix the plant, and from where?
Nearly EUR 500,000 from Romania's 2026 state budget has been allocated to restore the Brădetu plant to the required operating standards, following discussions between the foundation and public authorities Romania Insider. Lead time, tender dates and supplier selection for the upgrade work are not reported in the supplied source.
What treatment stages should a small municipal plant on a Natura 2000 river prioritise?
For a small municipal works discharging to a sensitive, ecology-designated river, priority is typically robust biological nutrient removal (often MBBR, SBR or MBR at low flows) plus tertiary polishing and disinfection, sized to comply with ammonia, total nitrogen and phosphorus limits, with ecological-flow conditions written into the permit Romania Insider. The Brădetu allocation in the source is for restoring an existing plant to required standards rather than a new train.
What is the proposed LIFE ASPRETE project, and could it affect suppliers?
The LIFE ASPRETE proposal submitted on 22 September would, if approved by the European Commission, fund a five-year mix of monitoring, habitat restoration, controlled restocking and a national action plan, plus a 1.5-hectare Asprete Sanctuary in Galeșu, Brăduleț commune, with partners in Austria, Hungary, the Netherlands, France, Germany and Romania Romania Insider. Procurement scope and contract values for the proposal are not reported in the supplied source.
