Ross-shire Engineering

What Ross-shire Engineering does

Ross-shire Engineering (RSE) is a UK-headquartered, privately held water-technology company founded in 1982 in Muir of Ord, Scotland, that designs, builds and maintains modular water and wastewater treatment systems, with a stated employee base of over 1,500 across the United Kingdom. The company's product platform centres on standardised, factory-built modular treatment units — including mechanical (microfiltration, ultrafiltration, nanofiltration, reverse osmosis), chemical (disinfection, coagulation, pH correction, phosphorus removal, ion exchange, UV disinfection) and biological (anaerobic digestion, MBBR, MABR, MBR, IFAS) processes — housed inside proprietary enclosures: the award-winning LMB® (a low-carbon replacement for industry-standard kiosks) and TMB® (a sustainable-timber modular enclosure). RSE also operates RSE Control Systems, described as the UK's leading controls and automation organisation and the largest operator within the municipal water market, providing SCADA, HMI, PLC, PAC, DCS, telemetry and control-panel solutions, and has begun layering digital-twin and smart-condition-monitoring services onto its installed base.

RSE generates revenue through a mix of design-build project delivery for utility and industrial clients (Water Treatment), recurring asset management and maintenance services (including digital optimisation and condition monitoring), product sales of its proprietary enclosures, and usage-based rental/hire solutions enabled by its modular architecture. The primary customer segment is municipal water utilities in the UK — most notably Scottish Water and Northumbrian Water — alongside industrial water-treatment applications. Go-to-market is enterprise field sales into utilities and industrial clients, with strategic-partner roles in major multi-year infrastructure programmes.

The business model is anchored by long-cycle framework agreements (most prominently Scottish Water's £8 billion 'The Enterprise' programme running 2027-2033, where RSE is one of seven named asset-delivery partners) and an acquisition-led growth strategy that has absorbed Blackburn Starling & Co (2021), Technical Control Systems (2021), Sheers (2021) and Aquazone (2024). Disclosed revenue grew from £60 million in 2019 to over £200 million by 2023, and the company received a minority growth investment from MML Capital in August 2023. The company has also begun expanding geographically into the United States. Pricing is quote-based and not publicly disclosed, reflecting enterprise, programme-scale contracting rather than standardised list pricing.

Name

Ross-shire Engineering

Legal name

Ross-shire Engineering

Website

https://ross-eng.com

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Ross-shire Engineering (RSE) designs, builds, and maintains modular water and wastewater treatment systems for UK water utilities and industrial clients, with proprietary enclosures (LMB®, TMB®) and an in-house controls/automation subsidiary (RSE Control Systems).

Ownership category

akta.pro rank

Product category

Water Treatment and Wastewater Engineering Services

NAICS

Water, Sewage and Other Systems (2213), Sewage Treatment Facilities (22132), Water Supply and Irrigation Systems (22131)

SIC

Water Supply (4941), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ)

akta.pro secondary industries

Water Reuse & Reclamation Infrastructure Construction (Recycled Water Systems) (IMAFAGAH), Water Reclamation & Reuse Production (Tertiary/Advanced Treatment) (EUANADAD), Advanced Treatment & Purification Utilities (MF/UF, RO, AOP, UV) (EUANAGAD), Design & Engineering for Renewal/Expansion (Pipelines, Pump Stations, Treatment Plants) (EUANALAD), Industrial Water Reuse Utilities (ZLD/MLD & Process Water Recycling) (EUANAGAG)

Keywords

• Water treatment solutions
• Wastewater treatment systems
• Modular enclosures
• Controls and automation
• Asset management services

Headquarters

HQ city

Muir Of Ord

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Water Treatment Design and Build: Design, build and maintenance services for water and wastewater treatment infrastructure projects. Includes modular technology solutions that reduce construction schedules and provide cost certainty.
2. Asset Management Services: Ongoing asset management including design, build and maintenance for non-infrastructure utilities projects. Covers digital optimisation, condition monitoring, and maintenance services.
3. Product Sales: Sale of proprietary modular enclosure products including LMB® and TMB® for water treatment applications.
4. Rental/Hire Solutions: Temporary water treatment solutions and hire equipment including pump services, enabled by the modular technology approach.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Ross-shire Engineering designs, builds, and maintains water treatment and water recycling equipment for UK water utilities and industrial clients. Its offerings centre on modular integrated product solutions incorporating proprietary LMB® and TMB® enclosures, mechanical, chemical, and biological treatment processes, RSE Control Systems (controls and automation), and ongoing asset management including digital twin monitoring and rental/hire solutions.

Product overview

Ross-shire Engineering (RSE) offers a modular water technology platform with integrated product solutions for water and wastewater treatment. The portfolio includes LMB® (low carbon enclosure), TMB® (sustainable timber modular enclosure for housing water treatment solutions), and RSE Control Systems (controls and automation for the municipal water market). RSE provides mechanical treatment technologies (microfiltration, ultrafiltration, nanofiltration, reverse osmosis), chemical processes (disinfection, coagulation, pH correction, phosphorus removal, ion exchange, fluoridation, UV disinfection), and biological processes (anaerobic digestion, MBBR, MABR, MBR, IFAS). The company also offers asset management services including digital twin, smart condition monitoring, and telemetry solutions.

Differentiator

Problem solved

Functional benefit

Brands

• RSE Control Systems: The UK's leading controls and automation organisation and the largest operator within the municipal water market.

Products and services

• LMB® Low carbon direct replacement for industry-standard enclosures used to house water treatment solutions, designed to reduce environmental impact while maintaining performance standards. Sold to water utilities and industrial clients.
• TMB® Modular enclosure built from sustainable timber designed to house water treatment solutions, offering environmental benefits including carbon storage and biodiversity support. Sold to water utilities and industrial clients.
• RSE Control Systems The UK's leading controls and automation organisation and largest operator within the municipal water market, providing SCADA, HMI, PLC, PAC, DCS systems, telemetry, and control panel solutions to water utilities.
• Water Treatment Solutions (Design and Build) Design, build and maintenance services for water and wastewater treatment infrastructure projects, integrating modular product solutions to reduce construction schedules and provide cost certainty. Delivered to UK water utilities and industrial clients.
• Asset Management Services Ongoing asset management services for non-infrastructure utilities projects, including digital optimisation via digital twin technology, smart condition monitoring, telemetry, and maintenance services for water utility clients.
• Nature-Based Water Treatment Solutions Sustainable water treatment solutions that harness natural processes to enhance biodiversity, offered alongside engineered water and wastewater treatment systems for utility and industrial clients.

Quantifiable outcome

• Revenue grew from £60 million to over £200 million since 2019
• +2 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Six partnerships are on record, tiered flagship, major and core.

• Scottish WaterflagshipStrategic or Co-development Partner · 23 December 2025RSE named as one of seven partner companies for Scottish Water's £8 billion 'The Enterprise' infrastructure programme covering 2027-2033. RSE serves as an asset delivery partner alongside Stantec, Aecom, M Group Water, Mott MacDonald Bentley, Farrans Limited, and WGM Engineering. The programme is Scottish Water's largest investment in its history.
• Stantec and AecommajorStrategic or Co-development Partner · 23 December 2025Primary design partners in the Scottish Water Enterprise programme alongside RSE as asset delivery partner. The joint enterprise works under an advanced partnering model to enhance Scotland's water and wastewater assets.
• M Group Water, Mott MacDonald Bentley, Farrans Limited, WGM EngineeringmajorStrategic or Co-development Partner · 23 December 2025Asset delivery partners in the Scottish Water Enterprise programme alongside RSE. These firms collectively deliver approximately one-third of SR27 investments under the £8bn six-year programme.
• Northumbrian WatercoreStrategic or Co-development Partner · 11 December 2025Northumbrian Water, in partnership with Aquazone (RSE subsidiary), Ross-Shire Engineering, and Costain, is conducting trials of environmentally friendly timber buildings at sewage treatment works in County Durham and near Darlington as part of £6.7m and £25.6m water quality enhancement projects.
• AquazonecoreStrategic or Co-development Partner · 1 October 2024RSE acquired a 75% stake in Norfolk-based water and utilities product supplier Aquazone in October 2024. The acquisition aims to diversify into the rental market and support growth in chemical and biological markets.
• Blackburn Starling & CocoreStrategic or Co-development Partner · 29 June 2021RSE acquired a majority share in Blackburn Starling & Co, one of the UK's oldest engineering companies established in 1870, through a management buyout. The deal enhances RSE's capacity and technical skills especially in water treatment, with plans to expand operations in England and Wales. Blackburn Starling retains its brand and heritage.

Scale indicators5 records

Expansion highlights7 records

Broad incumbents

• Veolia Water Technologies: Global water and wastewater treatment solutions provider; broad incumbent in advanced treatment, reuse, and ZLD systems that overlap with RSE's industrial process water and tertiary treatment offerings.
• Black & Veatch: Global engineering, procurement and construction firm with significant water/wastewater infrastructure practice; broad incumbent in utility-scale water treatment plant design and build, comparable to RSE's full-scope delivery model.
• Xylem: Global water technology company offering pumps, treatment, and metering solutions; broader incumbent across municipal and industrial water with overlapping treatment technology to RSE's MF/UF/RO portfolio.

Direct peers

• Stantec: Global engineering and design firm; co-partner with RSE on Scottish Water's £8bn Enterprise programme as a primary design partner, directly comparable in water/wastewater infrastructure delivery in the UK.
• Costain: UK engineering solutions provider; partnered with RSE/Aquazone on Northumbrian Water water quality enhancement projects and operates in overlapping water infrastructure delivery.
• AECOM: Large global infrastructure consultancy; co-partner with RSE on the Scottish Water Enterprise programme and a major UK water sector competitor across design and asset delivery.
• M Group Water: UK water infrastructure services provider; fellow asset delivery partner in the Scottish Water Enterprise programme, directly comparable in utility-facing water services delivery.
• Mott MacDonald Bentley (MMB): UK-focused water and infrastructure design-and-build contractor; named alongside RSE as an asset delivery partner in the Scottish Water Enterprise programme.
• Farrans Limited: UK and Ireland infrastructure contractor; fellow asset delivery partner in Scottish Water's Enterprise programme with overlapping capability in water/wastewater construction.
• WGM Engineering: Scotland-based multi-disciplinary engineering firm; fellow asset delivery partner in the Scottish Water Enterprise programme, comparable in water sector mechanical/electrical delivery.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/rse-ross-shire-engineering

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries3 records

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A4 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Ross-shire Engineering