Whatever your type of water, flow (small, mid or large) and industry, we support you in every stage of the water cycle and your plant's life cycle. At Nijhuis Saur Industries (NSI), part of Saur Group, we deliver peace of mind, performance, and true partnership.
From first concept to long-term optimization, our integrated approach — design, build, operate, and maintain — helps you reduce environmental impact, ensure compliance, and maximize value. We offer a one-stop-shop services including engineering, construction, operations, maintenance, financing, and even ownership.
NSI is your trusted partner for drinking & ingredient water, offshore/energy, wastewater, process water, or waste-to-energy, decentralized systems, mobile water or large-scale installations.
Research, optimization and consultancy
Every plant life-cycle journey starts with insight.
From applied research to hands-on process audits, we partner with you to understand your operations, identify inefficiencies, and deliver tailored solutions that work smarter and last longer.
What we offer:
- Applied research and expert studies on water treatment technologies and processes, including biological systems.
- Process audits and water mapping, including ReAct planning for 24/7 emergency water security (Mobile Water Solutions
- Industry-specific consulting
- Process optimization
- Nutrient and resource recovery
- Customized chemical selection and dosing
- Training and workshops via NSI Academy
Ideal for: Reducing OPEX, planning upgrades, meeting ESG goals, investigating and comparing new technologies, processes and applications

Project execution and commissioning

Whether starting from scratch or scaling up, we deliver fully engineered solutions — on time and on target. From piloting or fully engineered design to commissioning, our flexible project approach suits even the most space- or time-constrained sites.
What we deliver:
- Pilot testing and validation to ensure performance under real-world conditions
- End-to-end design, build, and engineering
- Upgrades of existing installations
- Full project execution and startup
- Compact, modular, and scalable systems
- Temporary treatment for emergencies, plant start-up, and extra capacity (Mobile Water Solutions)
- On-site commissioning and operator training
Ideal for: New installations, pilots, upgrades, emergency response, seasonal scaling
Operation and maintenance
Peace of mind through reliable, safe, and efficient operation and asset management that supports your business and improves your profitability.
Your water and waste-to-energy systems are vital — and we’re here to keep them performing at their best. From onsite and digital insights to predictive maintenance, and expert backup, at NSI we ensure that you stay in control.
What we provide:
- Environmental and HSE compliance
- Continuous and specific planned improvements
- Direct access to water specialists
- Onsite and remote technical support
- NSI Digital dashboards with real-time monitoring and alerts
- Critical spare parts management and provisioning
- Reactive, proactive, preventive, and predictive maintenance asset management systems
- Membrane replacement, upgrades & overhauls
- Consumables and sludge management
- Local helpdesk and on-call service

One-Stop-Shop service approach
Whether you are a municipal water authority, drinking water provider, an industrial production/processing facility, or a project developer for real estate or biogas, our worldwide local teams match your requirements with the right service offer. This is what we call a ‘one-stop-shop service approach’:
- Consultancy
- Inspections
- Sampling, lab analysis and/or testing
- Chemicals: NSI Purification Agents
- Rental: Mobile Water Solutions
- Upgrades / Product sales
- Remote technical support
- Monitoring and digital services
- O&M contracts
- Spares (wear and tear / critical / startup package)
- 24/7 helpdesk
- Call-outs / reactive maintenance
- Preventive maintenance
- Training / Academy
Trusted by industry leaders, delivered locally, based on a wide range of capabilities
As part of the Saur Group, NSI combines global strength with local expertise. Our NSI regional centers and NSI technology companies bring deep industry knowledge — ensuring your business always gets the right solution, wherever you are.
We offer a comprehensive suite of capabilities designed to support the entire water cycle for industrial and municipal clients. Our state-of-the-art laboratories and pilot facilities enable us to conduct in-depth analyses and on-site trials, ensuring tailored solutions that meet specific operational needs. We specialize in designing, building, financing, operating, and maintaining (DBFMO) (waste)water and waste-to-energy plants, providing end-to-end project delivery aligned with sustainability goals.
Our manufacturing facilities in the Netherlands, Italy, and the U.S. produce high-quality, customized systems that comply with international standards such as ATEX, Norsok, UL, and CSA.
To ensure optimal performance and compliance, our dedicated service (including Mobile Water Solutions) teams offer ongoing support, including preventive maintenance, upgrades, and digital monitoring through our NSI digital platform.


Get ready to minimize risks and create peace of mind
Whether it’s a new facility or a smarter way to run your current plant, we’re here to help you — today and tomorrow.
