Best water treatment companies in Castile and León

Veolia, formerly Aquona, is a benchmark in the comprehensive management of the water cycle in Castilla y León, providing services to over a million inhabitants. Its recent integration under the global Veolia brand in December 2025 strengthens its ability to combine global experience with local impact.

ACCIONA Agua has executed nearly 30 treatment and purification plants in Castilla y León, demonstrating extensive experience in the region. Its focus on infrastructure modernization and the implementation of real-time monitoring systems position it as a key player in smart water management.

Aguambiente offers a wide range of services covering the entire spectrum of water treatment and management, from potabilization to industrial wastewater treatment. Its comprehensive and versatile approach makes it a company capable of meeting diverse needs in Castilla y León.

FCC Aqualia is an FCC subsidiary specializing in comprehensive water management, with a consolidated track record and the award of significant contracts in Castilla y León. Its recognition as 'Best Water Management Company in the World' in 2007 endorses its leadership and capability in the sector.

SOMACYL, as a public entity, plays a fundamental role in water treatment in Castilla y León, leading the execution, operation, and maintenance of wastewater treatment plants. Its significant authorized investments in 2025 and 2026 demonstrate its commitment to improving water infrastructure.

PROAMBIENTE AGUAS is a pioneering company in Castilla y León with over 27 years of experience in water treatment. Its specialization in advanced technologies such as reverse osmosis and its focus on comprehensive solutions make it stand out in the region.

Aqlara has consolidated its activity in Castilla y León with 32 projects linked to the comprehensive water cycle and a key boost in 2025 with 15 new awards. Its sustained growth and the expansion of services in all provinces demonstrate its relevance and adaptability.

Aquanova is a leader in analytical laboratory services and has developed compact wastewater treatment equipment with its own patent, supported by the Junta de Castilla y León. Its focus on innovation and proprietary technology positions it as a relevant company for advanced solutions in the region.

GESEN offers comprehensive water management in Castilla y León, covering everything from human supply to wastewater treatment. Its ability to plan and direct projects, along with quality control in accordance with regional regulations, makes it a solid option for water management.

MSB Treatment Plants specializes in wastewater treatment solutions in León, standing out for its iBag® total oxidation treatment plant, which is cutting-edge in technology and self-manageable. Its local focus and commitment to sustainability make it a company to consider for efficient solutions.

Ingeobras is a water engineering company that carries out projects and comprehensive solutions for hydraulic engineering, with concrete examples of treatment plants executed in Castilla y León. Its experience in the design and execution of infrastructures positions it as a relevant player in the region.

Desincor offers water treatment in León, with a strong emphasis on compliance with Royal Decree 140/2003 for water suitable for human consumption. Its specialization in the management and control of potable and wastewater makes it an essential service provider for water quality in the province.

Adiquímica, with over 40 years of experience, specializes in the manufacture of water treatment products and offers comprehensive treatment for all types of industries. Its R&D+i department ensures innovative and optimized solutions for efficiency and regulatory compliance.