Smart Water Solutions. Local Expertise. Global Impact
Established in the UK for over 20 years, we operate from six strategic locations, employ a workforce of over 400 skilled professionals, and currently operate and maintain more than 30 water treatment assets on behalf of our clients.
We serve Municipal, Industrial, and Commercial clients across a wide range of sectors, supporting them with bespoke solutions for Drinking Water, Wastewater, Process Water, Water Reuse, and Resource Recovery. Whether it’s ensuring compliance for utilities, enhancing operational efficiency for manufacturers, or enabling circular water use in commercial facilities, our team of experienced professionals is committed to delivering results that are sustainable, efficient, and reliable.
Our mission, #MissionWater, is brought to life through our ‘Customer for Life’ philosophy — a long-term partnership approach that begins with understanding your challenges and continues with delivering performance and value throughout the lifecycle of your assets. Through our integrated approach to Technology, Services, and Solutions, and our commitment to the 4R Principle — Reduce, Reuse, Remove, Recover — we help turn water and wastewater challenges into opportunities for resilience and resource optimisation.

About Us
Our Mission
At NSI UK & Ireland, we believe water is our planet’s most precious resource, and it’s time everyone treats it that way. Our purpose is to be an advocate for water, ensuring that municipalities, industries, communities, and individuals across the UK and Ireland truly value it.
Beyond our daily work of providing reliable water supplies and responsible treatment solutions, we’re committed to acting and influencing others. Together, we can invest in saving water and innovate new models to preserve this vital resource.
For too long, we’ve treated clean water as an endless, cheap commodity, overlooking its true worth, but with increasing pressure on water quantity and quality, it’s clear this resource desperately needs revaluing – environmentally, socially, economically, and technologically. It’s time to turn the tide – we need to ensure water is valued as the revitalising force it has always been, making its benefits accessible to all.
We call this #MissionWater. Are you ready to join the movement and help us secure a sustainable water future for the UK and Ireland?
Global Expertise, Local Impact
At NSI UK & Ireland, you get the best of both worlds: global knowledge combined with deep local experience. Our extensive network of regional sales and service offices, local agents, and trusted business partners ensures you receive tailored solutions that are not only backed by world-class engineering expertise but also delivered with dedicated on-the-ground support. Every project we undertake is developed by multidisciplinary teams, seamlessly integrating global innovation with invaluable local insight to meet your unique needs.
Added value services
At NSI UK & Ireland, we provide end-to-end project delivery, seamlessly managing your water and wastewater projects from initial design to final commissioning. We specialize in turnkey solutions and offer a comprehensive portfolio of supporting services to ensure your project’s success.
Our expert teams handle every aspect, including:
- Design Works (utilizing 3D modeling)
- Pilot Testing
- Process & Process Design Engineering
- Electrical Engineering
- Mechanical Engineering
- On-site Supervision & Coordination
- Installation, Commissioning & Servicing
- i-Monitoring
- Laboratory services
- Compliance (legionella, boiler water, cooling water)
- Flood risk
- Energy management systems (municipal, industrial, commercial)
Our approach
End-to-end partnerships at every stage of your plant’s life cycle.
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.
Our Services
Wastewater Treatment
Our wastewater treatment solutions are tailored to meet the specific needs of municipalities and industries, ensuring both regulatory compliance and sustainable outcomes. We employ a multi-stage approach, starting with primary treatment to remove solids and grit. Secondary treatment utilizes biological processes to reduce organic matter, followed by advanced tertiary treatment (like membrane filtration and nutrient removal) for more stringent requirements. Our solutions are customised for various industries, incorporating industry-specific technologies and resource recovery options. Additionally, we manage sludge treatment and disposal, employing techniques like thickening, dewatering, digestion, and sustainable disposal practices to minimize environmental impact and maximize value.
Drinking and Process Water Production
We design, build, and operate water treatment plants to produce safe, potable drinking water that meets the most stringent quality standards. For industries requiring high-quality process water (such as manufacturing, pharmaceutical, and food processing), we offer tailored solutions. Our expertise includes industry-leading technologies for filtration, purification, softening, and disinfection, ensuring improved water quality and enhanced operational efficiency
Commercial Buildings
Commercial Buildings Solutions are a broad-spectrum water treatment and building services provider.
Offering a total solutions approach to a wide range of clients’ commercial buildings, NSI CBS (formerly known as Deba) deal with a vast array of projects as diverse as data centres, industrial sites, schools, universities, and heritage sites.
Our extensive capabilities include:
Boilers & Cooling Towers:
Chemical treatment, service, and compliance with complete treatment systems, including dosing, control, automation and pretreatment. Process water equipment (for example RO and Softeners), sales & service and installation.
Legionella Control:
A founding member of the Legionella Control Association with a dedicated nationwide team delivering comprehensive water and air (full HVAC) hygiene and compliance, we deliver a wide range of services including risk assessments. With expertise on call 24/7 and UKAS water testing, we are a partner that can be trusted to keep your building compliant.
i-Maintenance:
Our i-Maintenance division offers innovative energy building management and encompasses many aspects of building maintenance and compliance.
Discover our solutions

Gas liquid contact system – Crescendo®
- Process water
- Industrial water

Media filtration – Disc filter
- Drinking water
- Wastewater
- Industrial water

- Industrial
Pasteurization – ByoPast®
- Resource Recovery
- Sludge
- Wastewater
- Industrial water
- Process water

- Industrial
Anaerobic – Econvert Anaerobic Rental
- Wastewater
- Industrial water
- Resource Recovery

- Industrial
Anaerobic – Econvert-DGF
- Resource Recovery
- Industrial water
- Wastewater

- Municipal
Digital solution – Hydranet
- Wastewater
- Drinking water

- Industrial
- Municipal
Filter – FlooScreen™
- Drinking water
- Process water
- Industrial water
- Wastewater

- Municipal
- Industrial
DAF – High rate concrete i-DAF
- Industrial water
- Drinking water
- Wastewater

- Municipal
- Industrial
NSI Digital Platform
- PFAS
- Micropollutants
- Wastewater
- Drinking water
- Source water
- Rainwater
- Resource Recovery
- Sludge
- Process water
- Industrial water

- Industrial
Anaerobic – Econvert-RTF
- Wastewater
- Industrial water

- Municipal
- Industrial
Anaerobic – Econvert-Dsulph
- Resource Recovery
- Industrial water
- Sludge
- Wastewater

- Municipal
- Industrial
Ammonia stripper – ByoFlex®
- Resource Recovery
- Industrial water
- Sludge
- Wastewater
- Process water

- Industrial
- Municipal
Screw press – NSP
- Industrial water
- Sludge
- Wastewater

- Industrial
Membrane – DEEPEST®
- Wastewater
- Industrial water
- Process water

Membrane – CeraMac®
- Drinking water

- Municipal
- Industrial
Aerobic – BIOCTOR-FlooBed®
- Wastewater
- Industrial water

- Municipal
- Industrial
Anaerobic – Econvert-IR
- Wastewater
- Industrial water

- Industrial
Anaerobic – Econvert-UASB
- Wastewater
- Industrial water

- Industrial
Anaerobic – Econvert-EGSB
- Wastewater

- Municipal
- Industrial
DAF – FlooDaf®
- Process water
- Industrial water
- Resource Recovery
- Wastewater
- Sludge
- Drinking water

- Municipal
Flocculation-coagulation – ILCA®
- Drinking water

- Municipal
- Industrial
Filter – IntenSieve®
- Wastewater
- Industrial water
- Resource Recovery
Our References

- Municipal
- Municipal drinking water
Mayflower Water Treatment Works (South West Water)

- Food & Beverage
- Industrial
Sharp’s Brewery Wastewater Treatment Plant
Contact our experts
NSI UK & Ireland - Truro Office
Main Office
Allet
Truro
TR4 9DJ
United Kingdom
NSI UK & Ireland - Wokingham Office
Toutley Road
Wokingham
RG41 1QW
United Kingdom
NSI UK & Ireland - Stoke Office
Whittle Road
Stoke-on-Trent,
ST3 7QD
United Kingdom
NSI UK & Ireland - Grangemouth Office
Earls Road
Grangemouth
FK3 8XG
United Kingdom
NSI UK & Ireland - Gainsborough Office
Corringham Road Industrial Estate,
Gainsborough,
DN21 1QB
United Kingdom
NSI UK & Ireland - Wallsend Office
High Street East
Wallsend,
NE28 7AT
United Kingdom
NSI UK & Ireland - Wynyard Office
Wynyard Park,
Billingham,
TS22 5TB
United Kingadom
