Engineering Water, Energy & Environmental Projects Since 1991

For over 30 years, Arginta has been designing, building, and maintaining municipal water, wastewater, and sludge treatment facilities. Today Arginta is one of the leading IPC contractors in the Baltics, having reference across the Europe and Asia

Discover our services

Certified company

130+ Completed projects

0 Canceled contracts

34 Years of experience

About Arginta

Practical engineers who get the job done

We’ve delivered 130+ water, wastewater, and sludge projects with 0 canceled contracts, following Yellow FIDIC rules to control costs and guarantee results. Our team includes Master’s-level engineers and is led by a PhD in technical sciences. No wasted resources — just efficient, long-lasting solutions for communities near and far.

Our track record includes 40% of Lithuania’s completed sludge treatments. We employ staff with deep academic expertise to keep costs predictable and treatment efficiency guaranteed.

Marius Citavičius Managing Director | Arginta

Company address Molėtų pl. 71, LT-14259 Vilnius, Lithuania

What we do

Precision Engineering. Proven Performance. No Compromises.

For over 30 years, Arginta has designed, built, and maintained water, wastewater, and sludge treatment plants, energy infrastructure, and industrial facilities. We don’t just complete projects — we guarantee they perform with OPEX efficiency built-in.

Designed to Work. Built to Last.

We don’t just build infrastructure — we ensure it performs efficiently for decades. Our expertise spans multiple industries, delivering cost-effective solutions with data-backed performance guarantees.

Our services

Consultancy & Design

We handle feasibility, 3D modeling, and FIDIC-compliant engineering for water, wastewater, and sludge projects.

Project Development

We manage the entire design-build cycle—planning to commissioning—to ensure OPEX-focused performance and reliable facilities.

Water Treatment (WTP)

We build drinking water plants for underground, surface, and industrial use, optimizing filtration, purity, and energy efficiency.

Wastewater Treatment (WWTP)

We provide advanced wastewater treatment using SBR, MBR, USBF, RBC, and more, achieving robust nutrient removal.

Sludge Treatment (STP)

We minimize waste and boost efficiency via thickening, dewatering, digestion (up to 650 kW biogas), drying, or incineration.

Pumping Stations (PS)

We design and automate pumping stations, booster setups, and pressure systems with efficient VFD-driven controls.

Equipment Installation

Our certified teams install pipelines, clarifier bridges, aeration systems, and steel structures for long-term durability.

Operation & Maintenance

We deliver full-service O&M, bridging skill gaps, controlling costs, and training operators to keep plants running smoothly.

Our values

Engineering Smart.  Building Better.

We design systems that use up to 70% less electricity, build wastewater treatment plants that run without aeration, and turn sludge into 650 kW of power. No wasted energy. No unnecessary costs. Just efficient, high-performance solutions that last.

✔ Chemical-free water treatment – Tertiary treatment improves water quality without chemical reagents.

✔ Reed bed wastewater treatment – Removes organics, nitrogen, and phosphorus with zero electricity.

✔ Heat recovery from sludge – Primary sludge hydrolysis boosts energy efficiency and nutrient removal.

✔ Custom-built solutions – Designed for municipal and industrial use, based on ATV-DVWK-A 131E standards.

Latest project

Engineering that delivers

With decades of expertise and a commitment to sustainability, Arginta has completed groundbreaking projects across municipal and industrial sectors. From water purification to sludge-to-energy solutions, every project is designed for efficiency and long-term impact.

Reconstruction of municipal water treatment plants, ensuring clean drinking water for 1.7 million residents daily

Design and installation of underground water pumping stations up to 130m deep with a 250 m³/h flow per well, guaranteeing continuous water supply

Implementation of biological wastewater treatment systems for large industrial plants, meeting EU discharge standards

Development of customized nitrogen and phosphorus removal processes, reducing environmental impact and operational costs

Sludge-to-energy projects – Arginta’s biogas cogeneration plants generate up to 650 kW of electricity, converting waste into power

Reconstruction of 8 municipal wastewater treatment plants, all completed without a single operational failure

Full reference list

Our expertise

Advanced Engineering for Reliable Infrastructure

We engineer efficient, cost-effective infrastructure for water, wastewater, and sludge treatment. Our data-driven designs improve system longevity, lower energy use, and ensure environmental compliance.

Core Competencies

Deep Well Pumping

Smart Pressure Control

Sludge Processing

Energy-Efficient Treatment

Biofiltration Treatment

Advanced 3D Modeling

We design high-efficiency systems for water, wastewater, and sludge treatment, from deep well pumping (130m depth, 250 m³/h flow) to sludge processing (6000 m³/h, 25% DS over 400m). Our biofiltration technology removes phosphorus and nitrogen without chemicals, while smart pressure control prevents hydraulic surges. Optimized sludge digestion cuts aeration energy by 70%, and precision 3D modeling ensures accuracy and efficiency in every project.

98% Process Efficiency

Up to 70% Energy Savings

Chemical-Free Tertiary Treatment

RBC & USBF Systems

Why choose us

Built on Expertise. Driven by Results.

Our certified specialists, cutting-edge R&D, and industry-leading reliability ensure that every project meets the highest standards of efficiency, sustainability, and cost control.

Certified Expertise

Our team holds top industry certifications, including ISO 9001 for quality management, ISO 14001 for environmental responsibility, and OHSAS 18001 for workplace safety.

Highly Qualified Specialists

Most of our engineers hold Master’s degrees from Vilnius Gediminas Technical University. Our leadership includes a Doctor of Technical Sciences.

Proven Track Record

With over 130 completed projects, including 46 treatment plant constructions and modernizations, our experience spans municipal and industrial sectors.

Award-Winning Performance

Recognized as Lithuania’s top EU-funded project contractor, with multiple "Product of the Year" Gold Medals for environmental solutions.

News & articles

Stay informed about our latest projects, industry insights, and technological advancements.

7 Mar

Arginta starts new project in Ukraine

At the end of January, Arginta, in a joint venture with ENERGY SAVING TECHNOLOGIES LLC, signed a €5.5 million contract...

28 Feb

Mission-Based Science & Innovation Program Implementation

Projekto vykdytojas: VšĮ Inovacijų agentūra Projekto partneriai: Kauno technologijos universiteto konsorciumas (Vilniaus Gedimino technikos universitetas, Mykolo Romerio universitetas, Asociacija Infobalt,...

5 Sep

Completed Vilnius wastewater treatment plant reconstruction project

One of the most complex projects in the history of UAB Arginta's activities – the reconstruction of Vilnius wastewater treatment...

Lets talk

Build Something That Lasts

We design, build, and maintain water, wastewater, and sludge treatment systems, pumping stations, energy solutions, and industrial infrastructure. Whether you need consulting, engineering, installation, or maintenance, we deliver systems that work — efficiently and reliably.

Get in touch

Have questions about water or wastewater projects? Need a reliable partner for sludge, pumping stations, or renewable energy solutions? Our expert team is here to help. We design, build, and operate sustainable systems that stand the test of time — no excuses, no missed deadlines.

Reach out, and let’s discuss how Arginta can meet your engineering needs while keeping costs transparent and outcomes guaranteed.

Call us +370 613 81434

Email info@arginta.lt