Engineering, Consulting & Financing

    Water Feasibility & Due Diligence Companies

    Techno-economic feasibility, environmental, and M&A due-diligence firms for water assets and deals.

    11 providers

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    • Suppliers with contractors sector experience
    • Providers operating in United Kingdom or Netherlands
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    11 results from 11 matched providers

    Brine Consulting logo

    Brine Consulting

    Verified
    Netherlands1-50 employees
    Mechanical Vapor Recompression (MVR) · Atmospheric Evaporator · Spray Evaporator +130 more
    apac · china · europe +3 more

    BRINE CONSULTING delivers senior-level strategy, technical design, and actionable insight across the full lifecycle of water-related challenges. We support clients with advisory and due diligence, advanced brine management and resource recovery, industrial and municipal water reuse, and MLD/ZLD systems. Our team also leads ESG and climate-resilience strategy, innovation scouting, and international development and PPP advisory. With deep specialization in desalination, brine valorization, circular economy models, and high-impact infrastructure, we help organizations turn water and waste streams into opportunities, providing clear thinking, rapid delivery, and solutions built for real-world results.

    Activated Carbon Filtration
    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    +85 more
    manufacturing
    energy-production
    Liquid X logo

    Liquid X

    Verified
    United Arab Emirates1-50 employees
    Granular Activated Carbon (GAC) Filters · GO–Polymer Composites · Cartridge Filters
    mea

    Liquid X is a water technology consultancy and commercialization platform focused on accelerating the deployment of next-generation filtration solutions, with a core emphasis on graphene-based water treatment. Founded to address the gap between breakthrough innovation and real-world implementation, Liquid X operates at the intersection of advanced material science, water infrastructure, and market deployment. While significant advances in water technologies exist globally, many remain confined to laboratories or early-stage ventures. Liquid X bridges this gap by identifying, validating, and commercializing high-impact solutions—particularly graphene-based filtration systems—within the GCC and wider MENA region. Our consultancy model is built around a full lifecycle approach: from technology scouting and technical evaluation to pilot design, validation, and scaled deployment. We work with asset owners, governments, and enterprises to translate emerging technologies into practical, site-ready solutions. This includes designing pilot programs with measurable performance metrics, enabling data-driven decision-making, and ensuring that innovations are proven under real operating conditions before scale-up. A key focus of Liquid X is the commercialization of graphene-based water filters. Graphene, a two-dimensional material with exceptional strength, permeability, and adsorption capacity, has the potential to fundamentally transform water treatment. Its nano-scale structure allows precise separation of contaminants while enabling faster water flow and lower energy consumption compared to conventional systems. Through strategic partnerships with innovators, researchers, and manufacturers, Liquid X is actively working to bring graphene filtration technologies from concept to market. These systems are being developed to address some of the most critical water challenges, including the removal of PFAS and emerging contaminants, heavy metals, dissolved solids, and industrial pollutants—while significantly reducing waste and energy intensity associated with traditional technologies such as reverse osmosis. Our role extends beyond technology development. Liquid X supports the full commercialization journey, including: Technical due diligence and performance validation Pilot implementation and third-party verification Integration with existing infrastructure Development of scalable deployment models Coordination with EPC contractors, facility managers, and regulators Ongoing monitoring, compliance, and optimization By operating as a vendor-agnostic platform, we ensure that solutions are selected based on performance, suitability, and long-term value—not vendor bias. The MENA region faces some of the world’s most acute water challenges, including scarcity, high desalination dependence, and rising energy costs. Liquid X is positioned to introduce more efficient, decentralized, and sustainable alternatives through advanced filtration technologies. Graphene-based systems, in particular, offer the potential for lightweight, modular, and energy-efficient treatment solutions that can be deployed at scale across residential, commercial, and industrial applications. At its core, Liquid X is not just a consultancy—it is an enabler of the next generation of water infrastructure. By combining deep regional expertise with global innovation networks, we are helping transform how water is treated, distributed, and consumed. Our mission is to accelerate the transition from legacy, resource-intensive systems to smarter, more sustainable water solutions—unlocking the full potential of graphene and other advanced materials to build a more water-secure future.

    Activated Carbon Filtration
    Nanofiltration (NF) Systems
    Point-of-Use (POU) Filtration Systems
    +11 more
    food-beverages
    hospitality-tourism
    Enisca Ltd logo

    Enisca Ltd

    United Kingdom

    Enisca is a multi-disciplinary design, engineering and construction business operating in the power and environmental sectors delivering innovative, sustainable and quality solutions for public and private sector clients in these markets. Enisca has developed and maintained strong partnerships and collaborative relationships in our industry. Our focus on safety, our customers’ needs, programme, cost and the efficiency of project delivery support our key objective of ensuring high levels of customer satisfaction. Design and construct Our experienced and skilled engineering teams work in partnership with our clients and related stakeholders from an optioneering stage through the cycle of design, construction, commissioning, training and handover to the aftercare of asset operation and maintenance. Process & MEICA design services. Feasibility ctudies and cite surveys. Carbon/energy and whole life cost assessment. Water treatment and pumping. Wastewater treatment and pumping. Industrial effluent treatment. Process plant and controls. Turnkey mechanical and electrical installation. Commissioning and training Our experienced skilled commissioning engineers (process, mechanical and electrical/control systems) endeavour to provide clients with a seamless, trouble free handover of completed projects from pre-commissioning through to process proving and training of operators. Power, control and automation Enisca Automation is the motor control centre and control systems integration division of Enisca. Enisca Automation provides a range of power distribution, control and automation solutions to a range of public, commercial and industrial clients. The Automation Division is TickIT accredited and our engineers work in partnership with our clients through the cycle of design, manufacture, commissioning, training and handover. Enisca Automation aftercare provision includes planned maintenance and service with emergency callout. MCC manufactured solutions to Form 2 and Form 4. ICA, SCADA, HMI and systems integration. G5/4 harmonic studies and reports. Power factor correction and surge protection. Thermographic surveys. Certified Profibus design and installation. Enisca Automation customers include a range of engineering & building services contractors, commercial and industrial business clients. Utilizing fully automated design, materials management, assembly and testing processes Enisca can supply product in compliance with the rigorous standards set out in BS EN 60439-1:1999 for low voltage switchgear and control gear assemblies, all products are fully CE certified. Process plant The in-house capabilities of our business set us apart. With the process, civil, mechanical, electrical and chemical engineering skills of our people we design and construct turnkey water and wastewater treatment and pumping solutions. In-house we design and manufacture water and wastewater process plant that can be incorporated into overall solutions. Our Power, Control and Automation Division designs, builds and commissions the motor control centres, automation software and SCADA systems that control our plants. Package treatment plants – Wastewater treatment for municipal and industrial applications. Package treatment plants – Potable water applications. Process plant manufacture. Screens. Scraper bridges. Picket fence thickeners. Package DAF plants. Package pumping stations and booster sets. Chemical dosing plants. Stormwater attenuation and pumping. Sampling and recording. Operation and maintenance Our operations and service engineers provide operation, maintenance, service and callout support. We have a strong, resourceful team to manage utility and industrial process plant installations. The Enisca Automation aftercare provision, includes planned maintenance and service with emergency callout.

    Networks - Water Supply
    Contractors
    GHD logo

    GHD

    United Kingdom

    We are a global professional services company that leads through engineering, construction and architectural expertise. Our forward-looking, innovative approaches connect and sustain communities around the world. Delivering extraordinary social and economic outcomes, we are focused on building lasting relationships with our partners and clients. Established in 1928, we remain wholly owned by our people. We are 10,000+ diverse and skilled individuals connected by over 200 offices, across give continents – Asia, Australia, Europe, North and South America and the Pacific region. Our integrated solutions address every element of the water cycle – from catchment to tap – for urban, rural and industrial applications. We take pride in offering independent advice on the most appropriate technologies, cost-effective design and methods of construction to maximise outcomes. Our offering includes feasibility studies, planning, design, project management and asset management services, as well as operational optimisation.

    Designers
    Environmental Surveys
    JN Bentley Ltd logo

    JN Bentley Ltd

    United Kingdom

    JN Bentley Ltd (JNB) is a leading, privately owned construction services provider in the UK. We now have an annual turnover in the region of £100 million, generated from projects in both the building and civil engineering markets. JN Bentley JN Bentley delivers civil engineering contracting services, together with mechanical and electrical expertise. Founded in 1972, the company has grown largely from repeat work, maintaining a focus on providing construction services with an open and honest approach. The JN Bentley team numbers over 2,000 colleagues. We pride ourselves on our large, directly employed construction workforce, a team that gives us and our clients added assurances for safety and quality. We look to find innovative solutions to traditional construction challenges, applying the latest technologies to drive efficiency and reach sustainable outcomes. Across JN Bentley and our design and build companies MMB and JBA Bentley, annual revenue now exceeds £500 million. Mott MacDonald Bentley (MMB) MMB provides fully integrated civil engineering feasibility, design, construction and commissioning services to the UK water sector. Established in 1999, it harnesses the contracting strength of JN Bentley and the design specialisms of Mott MacDonald to form a 3,000-strong team – with further expertise brought in from across the Mott MacDonald Group when required. MMB was formed specifically to deliver long-term, high-volume capital programmes collaboratively with water companies. With a focus on innovation, affordability, and flexibility, since securing its first contracts with Yorkshire Water in AMP3, MMB has grown to deliver work for eight of the largest water companies in the UK.

    Renewables & Energy Management
    Contractors
    McAdam logo

    McAdam

    United Kingdom

    Established in 1963, McAdam engineer sustainable solutions which transform communities and enhance our natural environment. We provide a wide range of services to support the realisation of our client’s projects, both in-house and with the support of our trusted supply chain. Supporting our technical expertise, we have in-house safety and project management professionals who bring a collaborative and proactive approach to project delivery. We offer a wide range of full project lifecycle services across a variety of engineering sectors including: Water supply and treatment. Wastewater collection, treatment, disposal and sludge management. River & coastal catchment management. Surface water and drainage. Civil Infrastructure and environmental improvement schemes. Recognising that our lived environment is facing rapid change we are developing and delivering solutions that seek to protect the natural and built environment and enhance our community’s wellbeing. We help our clients tackle issues and build resilience to growing populations, climate change, pollution, and changing lifestyles. We help them achieve regulatory and legislative compliance within constrained economic times. This is achieved through collaborative engineering excellence, innovative thinking and strong programme and project management. Our approach to delivery of affordable and sustainable solutions is built upon teamwork and creation of long-term collaborative partnerships with our clients, construction partners and specialist supply chain members. The success of our approach is demonstrated by the longevity of our position on key frameworks and the breadth and scale of projects we have delivered over the past 60 years. Our engineering team has significant experience in client led investigations, feasibility studies, concept designs, strategic procurement advice and construction project management. The knowledge and expertise gained from that experience is successfully applied to detailed design services for traditional construction projects, part of design & build partnerships, and in more collaborative delivery models which use Early Contractor Involvement to drive innovation, risk reduction and TOTEX efficiencies. As part of our multi-disciplinary practice we also offer in-house architecture, project management, Health & Safety advisor, principal design, project supervisor, and design process services to supplement our engineering capabilities.

    Designers
    Architects
    Quantum Engineering Developments Ltd logo

    Quantum Engineering Developments Ltd

    United Kingdom

    Quantum Engineering Developments Limited specialises in the design, construction installation and commissioning of surge control systems, compressed air systems and booster pump sets. Surge Control Systems Surge conditions, or ‘water hammer’ can occur due to starting or stopping a pump, or failures in the power supply, controls or valves. Quantum Engineering is the leading UK supplier of surge vessels and related control equipment for the alleviation of this effect. All systems can include a patented QUBE controller, developed especially for surge vessel and accumulator control in complex variable flow rate and multi-pump systems. Packaged Booster Pump Sets The company supplies booster sets suitable for applications in final effluent and potable water booster pumps for sewage and water treatment installations. Control Panels Quantum Engineering specialises in the construction of multi-compartment control panel suites to suit the requirements of most UK water authorities. Electrical control panels are available with relay, PLC and microprocessor controlled logic systems, including variable speed drives and soft start, as well as conventional DOL and STAR/DELTA starters. Accreditation All systems are factory tested in house, and are assembled and fitted to meet current statutory requirements, including UK pressure systems legislation and DWI Regulations 25 and 31. Recent Contracts QED supply and install surge vessels via both main contractors and direct with the end users, to nearly all of the UK water companies on both new and replacement/refurbishment projects. What can Quantum do for you today?

    Accreditations
    Spaans Babcock Ltd logo

    Spaans Babcock Ltd

    United Kingdom

    Spaans Babcock was established in 1897 and has been supplying equipment into the water industry since this date. The company are the world’s largest supplier of Archimedes screws having thousands of screws installed throughout the UK & tens of thousands worldwide. Additionally the company supply, install and maintain aeration equipment (surface and brush aerators), screens and screenings handling equipment, a complete range of flow isolation equipment including penstocks, flap valves and stop-boards. Over recent years the company has expanded significantly with the addition of Archimedes screw generators to its product range. This is a natural progression for the product which is perfectly suited to low head applications, they offer several advantages over alternative technologies including no requirement for fine screens, fish friendliness, non-blocking and low maintenance due to the simple & robust design. The screw generator is offered in various alternative designs to suit given site circumstances. Spaans have agreements in place with many of the UK Water companies & agencies for the design, manufacture, supply, installation and maintenance of their equipment. Centrally based in Heywood, the company offers a full range of services from supply only contracts through to development of complete bespoke packages. Project management is handled by the companies own project teams and the company has its own SHE officer to ensure compliance with the stringent UK requirements. All installation and maintenance work is handled by in house teams of engineers.

    Renewables & Energy Management
    Veolia Water Technologies UK logo

    Veolia Water Technologies UK

    United Kingdom

    Veolia Water Technologies (VWT) provides an unrivalled combination of capabilities in the UK for the treatment of water, wastewater, sludge and odour. VWT provide turnkey solutions from feasibility studies, design and build and supply and installation of packaged treatment solutions, through to the extension or refurbishment of existing water and wastewater facilities. The company’s investment in Research & Development focuses on developing the most innovative solutions for its municipal and industrial clients, while at the same time considering the environmental challenges being faced. VWT’s goal is to develop sustainable and technologically superior solutions that balance the demand for efficient and cost effective technology whilst protecting the environment by looking at energy consumption, carbon emissions, odour pollution and safe guarding water quality. With over 125 years of experience in the UK, VWT is able to draw upon an unsurpassed knowledge of traditional and innovative solutions in order to meet the demands of both industrial and municipal clients. Performance is measured by the global satisfaction of VWT’s customers. Their technical creativity is reflected by a prestigious track record of extensive references in the UK and across the world supported by operational experience. A partnership with VWT provides the unique benefits of technical excellence, innovation, reliability and a trusted partnership. VWT offers a range of proprietary technology for applications to treat Drinking Water, Wastewater, Sludge Treatment, Odour Treatment and Industrial Effluents.

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    Water Engineering Services Ltd logo

    Water Engineering Services Ltd

    United Kingdom

    Water Engineering Services Ltd is tailored to provide a full turnkey solution to fulfil clients’ needs.   The team brings extensive knowledge of working within the wider water industry and other similar industries e.g. commercial, industrial, petrochemical and pharmaceutical. We recognise the benefits and challenges incorporating innovation into a project noting innovation can be new technology or working methodology. With our experiences working outside the Water Industry and with a wide range of Delivery Partners, WES Ltd look to bring innovation and best practices into all their projects to ensure the best project completion is achieved for all parties. WES Ltd considers Design for Manufacture and Assembly (DfMA) methodologies during the Design phase on all projects and having the Fabrication arm of the business allows for DfMA concepts to be realised, as well as providing bespoke solutions for end clients or other suppliers. Water Engineering Services consists of 3 in house areas of business: DESIGN: Our in-house design department specialises in mechanical & electrical designs but has very strong ties with Delivery Partners to also offer structural, civil, hydraulic and system integration. Our design team cover all aspects of a project from feasibility studies and optioneering to fabrication and construction drawings. ON-SITE INSTALLATION & COMMISSIONING: Our WES Ltd installation team, constructs, commissions, and optimises a project regardless of scale and complexity. This is achieved by utilising the experienced in-house mechanical & electrical team or managing a Delivery Partner or specialist contractor. Our Project Managers, Site Managers/ Supervisors, Design and CAD Engineers, Commissioning Engineers, Electrical and mechanical Site operatives all have up to date industry competency training and certification. All our electrical work will be fully tested CompEX and NICEIC certified. FABRICATION: With our 15,000 square foot workshop, offering stainless and mild steel fabrication to BSEN 1090 Execution class 2 and WRAS approval. ACCREDITATIONS WES Ltd is accredited with: ISO 9001 (Quality Management Systems) 14001 (Environmental Management Systems) 45001 (Occupational Health and Safety Management Systems) EN 1090 Ex Class 2 SafeContractor SafePQQ-PAS91 CHAS CHAS Advanced-PAS91 Achilles UVDB Silver + ISO 26000 (working towards) WES Ltd internal systems also conform to ISO 19650 (Information Management – BIM) and allow for integration into a client’s internal system e.g., ProjectWise.

    Networks - Water Supply
    Contractors
    WISP Global Limited logo

    WISP Global Limited

    United Kingdom

    WISP (Global), are a small dynamic engineering consultancy dedicated to serving the water utility industry in the UK, with a strong focus on sustainability and innovation. Specialising in process unit sizing and modular design, we create tailored innovative solutions to meet our clients' needs. Our team conducts feasibility and treatability studies, evaluating the viability of new projects and treatment methods. Our aim is to guide our clients towards sustainable solutions that align with their goals by considering environmental impact, cost-effectiveness, and technical feasibility. From initial concept to execution and successful project delivery, our team works closely with clients to ensure projects are completed on time, within budget, and to the highest standards. Choose WISP as your trusted partner for water utility engineering solutions that embrace innovation, sustainability, and lasting impact. Together, we’ll build a resilient and sustainable water future.

    Project Planning & Surveying
    Contractors

    Water Project Feasibility Studies: Optioneering, Cost Estimation, and Business Case Development

    Water project feasibility studies are the structured technical and economic assessments that precede capital investment decisions for water supply, wastewater treatment, or water resources projects. A feasibility study defines the project need, identifies and evaluates options, recommends a preferred solution, and produces a cost estimate sufficient for business case approval. Stages: (1) Problem definition: characterise the driver (population growth demand, regulatory compliance, asset failure, climate resilience, environmental target); establish design basis (population projections, demand forecast, water quality standards, consent conditions); (2) Options identification: generate long list of technically viable solutions (typically 8 to 15 options); initial screening against non-negotiables (planning constraints, EA environmental considerations, land availability); (3) Multi-criteria analysis (MCA): weighted scoring of shortlisted options (typically 4 to 8) against technical, economic, environmental, social, and programme criteria; Ofwat and water companies use structured option assessment frameworks (OAF); (4) Preliminary design: concept-level design of preferred and shortlisted options (P50 cost estimates to AACE Class 4 or RIBA Stage 1 accuracy: typically +50/-30 percent); (5) Economic appraisal: whole-life costing (NPC, net present cost, at 3.5 percent real discount rate per HM Treasury Green Book; or WACC for water company investment); cost-benefit analysis (CBA) for WINEP or WRMP submissions; value engineering workshop. Cost estimation standards: AACE International classification system (Class 5: +100/-50 percent for concept screening; Class 4: +50/-30 percent for feasibility; Class 3: +30/-15 percent for preliminary design; Class 2: +20/-10 percent for control estimate; Class 1: +10/-5 percent for bid/tender).

    Water Resources Management Plan (WRMP) feasibility: water companies in England and Wales are required by Ofwat and the EA to publish a WRMP every 5 years (WRMP24, covering 2025 to 2050); WRMP includes a supply-demand balance assessment and identifies the preferred programme of demand management and supply enhancement to maintain at least 99.9 percent levels of service (99.9 percent reliability of supply in all years, defined by EA's WRMP guidelines). WRMP feasibility studies assess: demand management (metering, leakage reduction, water efficiency); non-potable sources (treated wastewater reuse, greywater, rainwater harvesting); new abstractions (groundwater, surface water, transfers); storage (new reservoirs, aquifer storage and recovery (ASR)); desalination; bulk transfers (inter-company transfers; National Water Grid concept). Gate reviews: WRMP options go through: Long List Assessment (LLA); Short List Assessment (SLA); Final Options Assessment (FOA); Preferred Programme Assessment (PPA). RAPID (Regulators Alliance for Progressing Infrastructure Development): joint process of Ofwat, EA, and Natural Resources Wales for multi-company water supply projects (new reservoirs, transfers); RAPID programme reviews include Swindon and Oxfordshire reservoir, transfers between regions. Water Framework Directive WFD Article 9: cost recovery principle requires that water services pricing reflects full costs including environmental and resource costs; feasibility of water charges must consider WFD cost recovery obligations.

    Business case development for water projects: Ofwat regulatory framework requires water companies to present a business case for capital expenditure during Price Review (PR24 submissions in 2023 for AMP8 2025 to 2030); HM Treasury Five Case Model applies to publicly funded water projects (strategic, economic, commercial, financial, and management cases); water company business cases structured to Ofwat's Business Plan Guidance (BPG) requirements: total expenditure (totex) baseline; outcome delivery incentives (ODIs); innovation; risk and return. Key documents: Outline Business Case (OBC) with cost estimate to Class 3 accuracy; Final Business Case (FBC) with Class 2 accuracy and procurement strategy. Optioneering tools: IWA (International Water Association) SSP (Strategic Scenario Planner); WaterGEMS network optimisation; WRAP (Water Resource Allocation Planning) model for catchment-scale water balance; cost model benchmarking against EA Infrastructure Cost Estimates (ICE database) and Spon's Civil Engineering Price Book. Uncertainty in cost estimation: cost growth from feasibility to construction typically 30 to 80 percent for water treatment projects due to ground conditions, planning, and regulatory changes; quantitative risk assessment (QRA) using Monte Carlo simulation (Palisade @Risk, Oracle Crystal Ball) provides P50 (50th percentile), P80, and P90 project cost estimates; contingency set at P80 minus P50 for project management contingency; optimism bias uplift (OB) applied per HM Treasury guidance (standard infrastructure projects: OB 44 percent on capital cost at business case stage).

    Frequently Asked Questions

    What does a water treatment feasibility study include?

    A water treatment feasibility study for a new or upgraded treatment works typically includes: (1) Design basis: raw water quality data (12+ months monitoring: turbidity, colour, TOC/DOC, THM formation potential, microbiological quality including Cryptosporidium oocyst count, pesticides, metals); population equivalent (PE) served; design flow (maximum day demand, peak hour demand, average daily demand); required treated water quality (DWI consent conditions; Environmental Permit for wastewater). (2) Options identification and screening: list of applicable treatment technologies matched to raw water quality (coagulation/filtration for turbid surface water; membrane filtration for cryptosporidium-affected sources; GAC for organics; UV/ozone for disinfection by-product control; RO for high-TDS groundwater); land area requirements; constraint screening (planning zone, flood risk, access). (3) Multi-criteria analysis: technical feasibility (pilot data availability; technology maturity TRL 7 to 9 for low-risk selection; vendor market strength); economic (capital cost, operating cost, whole-life cost); environmental (carbon footprint, chemical use, sludge generation, residuals disposal); social and community acceptance; programme (design, planning, procurement, and construction duration). (4) Preliminary design of shortlisted options: process flowsheet; site layout; preliminary sizing of key tanks, vessels, and pipes; equipment schedule; electrical load estimate; chemical consumption estimate. (5) Cost estimate: AACE Class 4 (feasibility grade, plus 50/minus 30 percent); capital cost broken down by discipline (civil, M&E, I&C, commissioning); operating cost (energy, chemicals, sludge, staffing); whole-life cost at 3.5 percent real discount rate over 25 to 30 year asset life. (6) Risk register: key risks to cost, programme, and performance; risk-adjusted cost estimate.

    How long does a water infrastructure feasibility study take?

    Water infrastructure feasibility study timescales depend on the project complexity, data availability, and stakeholder requirements: Simple treatment upgrade (single process addition, no planning): 3 to 6 months (desk study and optioneering: 1 to 2 months; outline design and costing: 1 to 2 months; report and review: 1 month). Complex new treatment works (new site, multiple process trains, DWI/EA approval): 9 to 18 months (site investigation: 3 to 6 months; raw water quality monitoring: 12 months minimum for seasonal variation; treatability study (bench-scale): 3 to 6 months; UV validation pilot (if required): 6 to 12 months; optioneering: 2 to 3 months; outline design: 3 to 4 months). WRMP water resources option feasibility: individual option feasibility within a WRMP: typically 12 to 24 months at Short List Assessment (SLA) stage; detailed feasibility (Preferred Programme Assessment, PPA): 18 to 36 months; RAPID (Regulators Alliance for Progressing Infrastructure Development) programme for multi-company strategic options: 3 to 7 years from RAPID pre-submission to financial close. Parallel activities to compress programme: simultaneous site investigation and preliminary optioneering; bench-scale treatability while long-list options being screened; early pre-application engagement with EA and DWI. UK EA planning consents (Water Framework Directive abstraction licence): typically 12 to 18 months for major new abstraction licence application; environmental impact assessment adds 6 to 12 months.

    What is a Water Resources Management Plan (WRMP)?

    A Water Resources Management Plan (WRMP) is a statutory long-term plan (25-year horizon, updated every 5 years) that each water company in England and Wales must produce under the Water Industry Act 1991 (as amended by Water Act 2003 and guidance under the Water Resources Management Plan Regulations 2007 and updated by Defra and the Environment Agency). A WRMP sets out how the water company will maintain a secure and reliable water supply to all customers over the 25-year planning period, taking into account: demand growth (population and household growth; non-household demand); demand management (leakage reduction targets; metering strategy; water efficiency; per capita consumption); supply change (climate change impact on yield; environmental flow requirements on licences; abstraction licence reductions under EA CAMS/WFD headroom requirements); drought resilience (target levels of service (LOS): 99.9 percent of years without restrictions; 1-in-200-year drought without hosepipe bans; specific LOS metrics by company); supply development options (demand management; new sources; reuse; storage; transfers). Process: company produces draft WRMP; public consultation (minimum 12 weeks); statutory consultee responses (EA, Natural England, Consumer Council for Water, Defra); EA and Ofwat review for consistency with WFD and WINEP; company publishes final WRMP. WRMP24 (covering 2025 to 2050) was published by all English and Welsh water companies in 2024; major themes: hosepipe ban reduction; PFAS removal investment; treated wastewater reuse; potential new reservoir (Severn-Thames transfer corridor).

    How are water project costs estimated at feasibility stage?

    Water project capital cost estimation at feasibility stage follows the AACE International Classification system (Class 4 estimate, feasibility grade, accuracy plus 50 percent / minus 30 percent): Methods: (1) Analogous (top-down): compare with recently completed similar projects; apply scaling factor for capacity (cost scales approximately as Q^0.6 to Q^0.7 for process plants; Q^0.4 to Q^0.5 for civil structures); adjust for location (BCIS Regional Location Factor; London typically 1.10 to 1.20 x UK average; rural Scotland 0.90 to 0.95 x UK average), time (BCIS TPI, Tender Price Index), and specification differences; (2) Parametric (unit rate): cost per unit of capacity (e.g. GBP/m3.day for drinking water treatment; GBP/PE for STW; GBP/km for pipeline); published benchmarks: EA Infrastructure Cost Estimates (ICE) database; Spon's Civil Engineering Price Book (annual Spon's publication); Mott MacDonald/Stantec/Jacobs internal benchmarks; examples: BWRO treatment works GBP 200 to 600/m3.day capacity; conventional drinking water treatment GBP 300 to 900/m3.day; STW activated sludge GBP 400 to 1,500/PE; distribution main DN100 to DN300 GBP 150 to 500/m; (3) Elemental (bottom-up): for AACE Class 3+ estimates; quantity take-off from preliminary drawings; rates from Spon's or internal rate books; breakdown by discipline (civil earthworks, concrete, structural steel, pipework, M&E equipment, I&C, commissioning); (4) Risk-adjusted cost: base estimate at P50; QRA (Monte Carlo) generates cost distribution; P80 cost recommended for business case contingency; OB (optimism bias) per HM Treasury: standard infrastructure +44 percent at OBC stage, reducing as project matures. Whole-life cost adds: operating cost (energy, chemicals, staffing, sludge disposal); maintenance (planned preventive maintenance: 1 to 2 percent of capital per year for M&E; 0.5 to 1 percent for civil); periodic refurbishment; discount rate 3.5 percent real (HM Treasury Green Book) for public projects; water company WACC for regulatory submissions.

    Case Study·Water supply infrastructure
    Challenge

    A water company in the East of England needed to evaluate five supply-demand balance options for a projected 85 Ml/day shortfall by 2040 identified in WRMP24. Options ranged from demand management and leakage reduction to a new 60 Ml/day SWRO desalination plant on the Norfolk coast. The feasibility had to produce a Class 4 cost estimate and multi-criteria analysis suitable for inclusion in the PR24 business plan submission.

    Approach

    Stantec were engaged to lead a 12-month feasibility study. Raw water quality was characterised at 4 candidate abstraction points over 18 months. Bench-scale treatability tests for PFAS removal (GAC and anion exchange) were run at Cranfield. AACE Class 4 costs were estimated using EA ICE database benchmarks, scaled by BCIS regional factors and a 2024 BCIS TPI uplift. A quantitative risk assessment (Monte Carlo) was used to generate P50 and P80 project cost estimates for each option.

    Outcome

    The MCA identified a combined demand management (25 Ml/day saving) plus BWRO at a brackish inland aquifer (40 Ml/day) as the preferred programme with a P50 capital cost of GBP 68 million and P80 of GBP 89 million, compared to the SWRO option at P50 GBP 142 million. The feasibility report was accepted by Ofwat as supporting evidence for the AMP8 business plan submission. The RAPID pre-submission for the BWRO scheme was initiated in parallel with the Ofwat submission.

    Questions to Ask Shortlisted Providers

    1. 1

      What AACE cost estimation class are you targeting at each stage gate and what data collection is needed to progress from Class 4 to Class 3 accuracy?

      An Ofwat business plan submission needs Class 4 at Long List and Class 3 at Short List; understanding the data requirements at each gate prevents underinvestment in ground investigation and treatability studies that later forces a re-run of the cost estimate.

    2. 2

      How are optimism bias and systemic risk treated in your cost model and are you applying HM Treasury Green Book or Ofwat business plan guidance?

      Ofwat's PR24 guidance requires optimism bias disclosure; under-disclosure of OB results in a business plan submission that Ofwat challenges or reprices at Final Determination, creating a funding gap for the capital programme.

    3. 3

      What WRMP24 demand scenario (central, high, low) have you used as the design basis and how sensitive is the option ranking to that demand assumption?

      The preferred option can change if demand growth is 20 percent lower than the central scenario; a sensitivity analysis must be part of the feasibility deliverable to demonstrate that the preferred option is robust.

    4. 4

      How will you incorporate the EA's CAMS abstraction sustainability headroom assessment and any RSA licence reduction risk into the supply yield estimates?

      EA is actively reducing abstraction licences in over-stressed catchments; any yield assumption that does not account for RSA risk may overstate supply and create a spurious supply-demand balance.

    5. 5

      What programme timeline from feasibility to operational delivery have you assumed and does it include realistic RAPID, planning, EIA, and EA licence timescales?

      Strategic water resource options routinely take 10 to 15 years from feasibility to water in supply; a programme that assumes 7 years will be rejected by Ofwat reviewers with knowledge of RAPID's historical delivery timescales.

    What Drives Cost in This Category

    Source water characterisation and treatability study

    A 12-month raw water quality monitoring programme at multiple candidate abstraction points costs GBP 80,000 to 200,000 in sampling and analysis; omitting this step forces assumption-based design that results in Class 4 accuracy widening to plus 100 percent in the worst case.

    AACE cost class and required design depth

    Progressing from a Class 4 feasibility estimate (12 weeks, GBP 80,000 to 200,000 consultant fee) to a Class 2 control estimate (RIBA Stage 3 design, 6 to 12 months, GBP 400,000 to 1,200,000 consultant fee) reduces cost uncertainty from plus 50 percent to plus 20 percent, often saving multiples of the additional fee in contractor contingency at tender.

    Planning and EIA programme risk

    A Nationally Significant Infrastructure Project (NSIP, DCO consent for strategic water resources) adds 3 to 5 years to programme compared to local planning (Town and Country Planning Act 1990); the choice of consent route determines whether a feasibility study is sized for a 7-year or a 12-year delivery programme, fundamentally changing the whole-life cost.

    Multi-criteria analysis weighting and stakeholder engagement

    MCA weighting of environmental vs economic criteria is politically sensitive for water companies; if the stakeholder engagement process (minimum 12-week consultation for WRMP) produces a different weighting preference from the consultant's assumed values, the preferred option can change and the feasibility study must be substantially reworked.

    Key Regulations & Standards

    Water Resources Management Plan Regulations 2007 and WRMP24 Guidance

    Water companies must publish a 25-year WRMP every 5 years; feasibility studies supporting WRMP24 must conform to the EA's Revised Draft WRMP Guidelines (2022) including the supply-demand balance methodology, demand management hierarchy, and option assessment framework.

    RAPID (Regulators Alliance for Progressing Infrastructure Development)

    Strategic water resource options requiring multi-company coordination (new reservoirs, inter-regional transfers) are assessed through the RAPID joint process of Ofwat, EA, and NRW; RAPID pre-submission must include a feasibility study meeting RAPID's technical evidence standards before gate approval to proceed to development consent.

    HM Treasury Green Book (Discount Rate and Optimism Bias)

    Feasibility cost-benefit analysis for publicly funded water infrastructure must apply the HM Treasury Green Book discount rate (3.5 percent real) and optimism bias uplifts (standard infrastructure: 44 percent on capital cost at OBC stage); Ofwat accepts Green Book methodology for AMP8 business plan economic analysis.

    WFD Abstraction Sustainability and RSA Programme

    New abstraction licences for WRMP supply options must demonstrate compatibility with WFD Article 4 (no deterioration in ecological status) and the EA's CAMS sustainability assessment; the EA's Restoring Sustainable Abstraction (RSA) programme is actively reducing existing licences in over-abstracted catchments, which must be reflected in supply yield assumptions.