Smart Water Solutions. Local Expertise. Global Impact
We offer a comprehensive range of both proven and innovative technologies and solutions for water and wastewater challenges. Our expertise covers wastewater treatment, sludge management, water reuse, and the recovery of valuable resources and energy from water streams. We're focused on turning your environmental costs into opportunities, helping you meet the evolving demands of both industrial and municipal sectors. With our Design, Build, Finance, Maintain, and Operate (DBFMO) model, we provide full-service project execution. We're always extending our offering to ensure you stay ahead of the latest environmental regulations and market trends.
Our 'Customer for Life' philosophy means we join you at the beginning of your water journey and stay with you every step of the way, helping you realize the full value of your water and wastewater assets. Through our Technology, Services, Solutions, and our Reduce, Reuse, Remove, and Recycle (4R) Principle, we're committed to protecting our planet's most precious resource.
This is our #MissionWater. Are you ready to join us in shaping a more sustainable future?

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.
Discover our solutions

- Industrial
- Food & Beverage
- Pulp & Paper
Anaerobic – Econvert Anaerobic Rental
- Wastewater
- Industrial water
- Resource Recovery

- Industrial
- Food & Beverage
Anaerobic – Econvert-DGF
- Resource Recovery
- Industrial water
- Wastewater

- Municipal
- Municipal drinking water
- Municipal wastewater
Digital solution – Hydranet
- Wastewater
- Drinking water

- Industrial
- Food & Beverage
- Pulp & Paper
- Fish processing
- Pharma & personal care
- Mining and minerals
- Energy
- Municipal
- Municipal wastewater
- Municipal drinking water
Filter – FlooScreen™
- Drinking water
- Process water
- Industrial water
- Wastewater

- Municipal
- Municipal drinking water
- Municipal wastewater
- Industrial
- Energy
DAF – High rate concrete i-DAF
- Industrial water
- Drinking water
- Wastewater
- Municipal
- Municipal drinking water
- Municipal wastewater
- Industrial
- Food & Beverage
- Fish processing
- Pulp & Paper
- Pharma & personal care
- Semiconductor industry
- Mining and minerals
- Energy
NSI Digital Platform
- PFAS
- Micropollutants
- Wastewater
- Drinking water
- Source water
- Rainwater
- Resource Recovery
- Sludge
- Process water
- Industrial water

- Industrial
- Food & Beverage
- Pulp & Paper
- Energy
Anaerobic – Econvert-RTF
- Wastewater
- Industrial water

- Municipal
- Municipal wastewater
- Industrial
- Food & Beverage
- Pulp & Paper
- Energy
Anaerobic – Econvert-Dsulph
- Resource Recovery
- Industrial water
- Sludge
- Wastewater

- Municipal
- Municipal wastewater
- Industrial
- Food & Beverage
- Energy
Ammonia stripper – ByoFlex
- Resource Recovery
- Industrial water
- Sludge
- Wastewater

- Industrial
- Food & Beverage
- Fish processing
- Pulp & Paper
- Energy
- Municipal
- Municipal wastewater
Screw press – NSP
- Industrial water
- Sludge
- Wastewater

- Industrial
- Pharma & personal care
- Energy
Membrane – DEEPEST®
- Wastewater
- Industrial water
- Process water

- Municipal drinking water
Membrane – CeraMac®
- Drinking water

- Municipal
- Municipal wastewater
- Industrial
- Food & Beverage
- Pulp & Paper
- Pharma & personal care
- Mining and minerals
- Energy
Aerobic – BIOCTOR-FlooBed®
- Wastewater
- Industrial water

- Municipal
- Municipal wastewater
- Industrial
- Food & Beverage
- Pulp & Paper
Anaerobic – Econvert-IR
- Wastewater
- Industrial water

- Food & Beverage
- Industrial
- Pulp & Paper
Anaerobic – Econvert-UASB
- Wastewater
- Industrial water

- Food & Beverage
- Pulp & Paper
- Pharma & personal care
- Industrial
Anaerobic – Econvert-EGSB
- Wastewater

- Pulp & Paper
- Food & Beverage
- Fish processing
- Pharma & personal care
- Energy
- Mining and minerals
- Municipal
- Industrial
- Municipal wastewater
DAF – FlooDaf®
- Process water
- Industrial water
- Resource Recovery
- Wastewater
- Sludge
- Drinking water

- Municipal drinking water
- Municipal
Flocculation-coagulation – ILCA®
- Drinking water

- Municipal
- Municipal wastewater
- Industrial
- Food & Beverage
- Fish processing
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
