In a landmark ruling issued on 11 July 2025, the High Court of Justice of Galicia (Tribunal Superior de Justicia, the High Court) declared that the Xunta de Galicia (Regional Government), and the Confederación Hidrográfica del Miño-Sil (CHMS) violated the fundamental rights of residents of As Conchas due to their inaction in the exercise of their oversight duties over the water contamination caused by the excessive concentration of intensive livestock farms in the region (the As Conchas Judgment). On 13 February 2026, the Spanish Supreme Court dismissed the cassation appeals filed by both administrations, confirming the judgment (which is now final).

Background

As Conchas (a small village in the region of A Limia, Ourense) sits downstream of a hydroelectric dam (which is also known as As Conchas) on the River Limia, in a rural area of roughly 21,000 inhabitants that has become one of the most intensive livestock-farming areas in Spain. Over 300 intensive pig, cattle, and poultry facilities are concentrated in the region, producing waste equivalent to that of a population of 1.5 to 2 million people. According to the As Conchas Judgment this has caused, at least since 2011, recurring toxic cyanobacterial blooms in the As Conchas dam reservoir, with nitrate levels far exceeding the legal limit of 50 mg/l — reaching 117 mg/l in one sampled well — and persistent offensive odours affecting daily life.

As Conchas residents (Claimants) brought proceedings under the special Spanish fundamental-rights procedure, alleging that the persistent contamination breached their rights under both the Spanish Constitution and the European Convention on Human Rights. Specifically, the Claimants alleged violations of their right to life, privacy, inviolability of the home and property, all read in conjunction with the constitutional right to a healthy environment. In terms of standing, the Claimants brought the claim represented by the local neighbourhood association (Asociación de Veciños As Conchas) and a national consumer federation whose standing was challenged by the Regional Government but upheld by the High Court, relying on the Spanish Organic Law of the Judiciary, constitutional case law, and the ECtHR’s KlimaSeniorinnen judgment.

The High Court’s Reasoning

The reasoning of the High Court has sparked interest for its application to diffuse agricultural contamination of a doctrinal framework developed by the European Court of Human Rights (the ECtHR) for point-source environmental nuisances — thus far this framework is applied primarily to noise pollution and industrial emissions in Spain.

Building on the 1994 López Ostra v. Spain (ECtHR Case N. 16798/90) and Spanish Constitutional Court judgment N. 119/2001, the High Court held that prolonged exposure to environmental degradation that is avoidable and unbearable engages fundamental rights even without an immediate threat to life.

The Regional Government was held primarily responsible for allowing the excessive growth of intensive farming without transferring the environmental risk derived from it to the farming companies, and for the ineffective management of waste that saturated the environment and contaminated groundwater. Together with the Regional Government, the CHMS was held jointly responsible for its inaction in the face of demonstrable deterioration since 2011, and for failing to adopt structural measures despite participating in authorisation processes and being aware of the volumes of waste involved.

The As Conchas Judgment rests on a finding of administrative inaction: no specific administrative act was challenged, but rather the repeated omissions of both administrations despite being fully aware of the progressive deterioration since at least 2011. This is reflected in CHMS's own data and successive river basin management plans which document the eutrophication of the reservoir and the failure to adopt effective measures to halt the environmental degradation and its associated health risks. The High Court held that this persistent inaction engaged the State’s positive obligation to protect residents’ fundamental rights.

Notably, there is a limited number of precedent judgments in Spain that have applied this reasoning to hold public administrations liable for their failure to supervise. The few available precedents are also quite dated, which highlights the significance and novel nature of the As Conchas Judgment.

The High Court also relied on the precautionary principle as an autonomous ground for the obligation to act. The High Court understands that abnormal analytical values alone were sufficient to trigger a duty of investigation before authorising further activity. According to the High Court, this was illustrated by the fact that bathing water was classified as “excellent” while the CHMS was simultaneously issuing a high-risk alert for the same location.

Remedies

The High Court ordered both administrations to adopt immediate measures to halt environmental degradation. These measures include a moratorium on new livestock-farming authorisations in the A Limia region, epidemiological studies, enhanced water-quality monitoring of the distribution network and private wells, effective bathing prohibitions when cyanobacterial contamination is detected, and alternative drinking water supplies. Individual claimants were awarded moral damages of EUR 30,000 each (EUR 6,000 for one claimant residing elsewhere), payable at a rate of EUR 1,000 per month, on the basis of the “undeniable moral harm” caused by almost 14 years of offensive odours, bioaerosol emissions, contaminated wells and persistent risk to their health, generating “distress and anxiety” at seeing the situation prolonged over time. No costs were imposed given the partial nature of the ruling.

Key takeaways

1. A rare condemnation of public authorities for environmental inaction

As Conchas Judgment is exceptional in Spanish case law. Unlike earlier ECtHR precedents (López Ostra, Moreno Gómez, Cuenca Zarzoso), which involved identifiable pollution sources, the contamination here arose from over 300 diffuse agricultural activities. The High Court resolved this evidentiary challenge by assigning responsibility entirely to the systemic failure of public authorities to exercise their supervisory and enforcement powers, marking an important doctrinal step. Comparable Spanish environmental cases have not combined diffuse pollution with a fundamental‑rights finding of this scope.

2. The limits of private‑law remedies in diffuse‑pollution scenarios

Private-law remedies were effectively unavailable. Under Spanish tort law, liability depends on identifying a specific tortfeasor and proving individual causation. The Spanish Environmental Liability Law (Law 26/2007) does not provide an alternative either. It establishes a public law regime focused on remedies addressing ecological damage, excluding individual harm claims, and likewise only operates where the damage can be linked to identifiable operators. The fundamental rights approach shifted the focus to whether public authorities had fulfilled their positive obligation to protect residents — an obligation that the High Court found clearly breached.

3. ESG implications for operators and authorities

The judgment has implications far beyond livestock farming. Moratoria, cumulative impact assessments and a reinforced precautionary principle signal stricter scrutiny for sectors such as mining, aquaculture and irrigation where environmental capacity may be exceeded. The ruling engages all ESG pillars: environmental (water pollution), social (health and moral harm) and governance (regulatory failure and accountability).

4. Conclusion

The final As Conchas Judgment confirms that the logic established in López Ostra and later developed in Moreno Gómez and Cuenca Cardoso, can be applied to diffuse, cumulative environmental harm caused by the inaction of public authorities. It elevates the precautionary principle into an enforceable standard and shows how EU‑level findings can expose domestic failures in individual cases. The message is clear: authorities must act where risks are known and operators must take cumulative impacts seriously.