Operations & Support

    Water Treatment O&M Companies

    Operations & maintenance contractors running water and wastewater assets under performance-based agreements.

    201 providers

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    201 results from 201 matched providers

    FLI Precast Solutions logo

    FLI Precast Solutions

    United Kingdom

    FLI Precast Solutions (formerly FLI Carlow) provide design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Our markets include Water, Wastewater, Energy and Storm Attenuation in the UK & Ireland and bespoke projects globally. SERVICES INCLUDE Design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Design to national and international water industry standards and our semi-precast modular designs make us the industry leader in off-site concrete engineering and manufacture. By early involvement and integrating with our clients’ design teams we can accelerate and improve design optimisation and reduce cost. The value is in the solution, and off-site manufacturing and fabrication leads to higher efficiencies and lower risks and costs. Framework agreements enable us to add more value through collaboration, innovation, economies of scale, supply chain partnering and cost management. Our products and designs are engineered to provide solutions to many challenges facing our clients: water retention, water storage, water conveyancing, water management, water treatment, fire-resistance criteria, chemical resistance parameters, infrastructural products, retaining walls, coastal erosion, decorative walls, to name a few. We are a solutions provider using innovative off-site concrete engineering and our industry leading semi-precast modular designs. The company is part of the FLI Group which is a diversified group of companies providing environmental solutions, services and technologies to private and public sector customers in the UK, France, Ireland and throughout the world. PRODUCTS INCLUDE Service reservoirs Process settlement tanks (PST / HST / FST / etc) Storm & attenuation tanks (network or site based) Process structures (ASP / TSR / GAC / RGF / etc) MCC service foundations Bund wall system Chambers Channel & lids Comms chambers Multi-purpose chambers Bespoke culverts Holding tanks Barriers Demountable fence supports (international airport approved) Ballast blocks Dry flow channelling Foundation bases Blast fence supports

    Precast Concrete
    Concrete Works
    Gardner Denver Ltd – Elmo Rietschle logo

    Gardner Denver Ltd – Elmo Rietschle

    United Kingdom

    Elmo Rietschle, part of the Gardner Denver Group is a major manufacturer and supplier of compressed air and gas, vacuum pump, blower and fluid transfer technologies to the water and wastewater industries. Its experienced engineers can assist on the concept design of pumps for the OEM market, right through to system design for end users and custom built packages for central air or vacuum supply. Additionally, a comprehensive network of workshop and service engineers operates from five key geographical locations, offering 24-hour support and service. The company has recently added the GBH-8 to its range of side channel blowers designed for use in wastewater purification applications and in the oxygenation of activated sludge tanks. Compared to a standard blower of similar output, the new GBH-8 is 65% lighter, has a 40% smaller footprint, and offers twice the power. Using techniques such as CFD (computational fluid dynamics), the GBH-8 also offers high performance, with a continuous build-up of pressure. The unit features rotational speed control for easy setting of the optimal operating point, with pulsation free air supply and low noise levels. In addition, bearing lifetime in the GBH-8 is 20,000 hours, meaning downtime for maintenance, and the associated costs, are kept to a minimum.

    Treatment Process Technologies
    PBA Applied Ecology Ltd logo

    PBA Applied Ecology Ltd

    United Kingdom

    PBA Applied Ecology Ltd has unparalleled experience in the environmental planning and practical management of water engineering schemes and in-channel river works. We have earned an outstanding reputation for delivering projects on time, on budget and to the satisfaction of all stakeholders. Our strength is Applied Ecology – the practical and innovative application of life sciences to real life situations. We assist with the planning and delivery of a range of water engineering schemes including reservoir engineering, catchment restoration and wetland creation, and are acknowledged for the successful completion of large scale projects on highly sensitive sites (SSSI, SAC). PBA offer a full range of services including baseline ecological survey, planning/consents, method statements, fish rescue, surface water management, water quality monitoring & control, invasive non-native species identification and control, biological monitoring, restoration design and delivery. Where appropriate, we apply protocols that are fully compliant with UK-wide delivery of Water Framework Directive. A frequent cause of stress amongst project teams is ensuring the maintenance of ecologically acceptable flow and water quality, and that impact on fish and other biota are minimised. PBA assist you in managing these aspects of water engineering projects. At the outset of each project, we can assist in agreeing achievable and ecologically acceptable water quality standards with regulators. Our staff then monitor, advise on containment works, and liaise with regulators throughout. PBA’s working methods are designed towards most efficient project delivery with minimum environmental impact. Engaging our specialist knowledge at an early stage of project design can help to ensure that the project is completed on time, on budget, and with enhanced conservation benefits. PBA deploy structured teams of professionals, to robustly deal with every challenge, from project conception, to aftercare management. And most importantly, we do this with safety as our No.1 priority. All of our staff are fully trained and equipped, and also attend PBA’s own water safety training/first aid course every year.

    Mapping & Modelling
    Wildlife Rescue & Relocation
    Power Plastics Ltd logo

    Power Plastics Ltd

    United Kingdom

    Power Plastics Ltd, an ISO 9001 certified company, design, manufacture and install a range of flexible roofing systems for process tanks extensively used within the water and sewage industry. Their roofs are manufactured from tough high quality reinforced PVC materials supported on skeletal frames manufactured from aluminium, galvanised steel or stainless steel. The covers can be designed to be easily removed and refitted within minutes by one or two people without the need for specialist equipment giving unrestricted access to the tank process. This has great benefits in respect to monitoring and maintaining the tank process in addition to the added health safety benefits associated with a confined spaces issues. The roofs can be used for many purposes with materials being suitable for contact with drinking water and being resistant to corrosive materials. All their installations are carried out by highly skilled fittings teams which are overseen by project managers, who ensure that all health and safety issues have been considered in addition to providing thorough risk assessments and method statements prior to commencing any work on site. All designs are structurally proven by independent structural engineers and comply with the latest CDM regulations.

    Designers
    RSE Controls (Blackburn Starling) logo

    RSE Controls (Blackburn Starling)

    United Kingdom

    RSE Controls (Blackburn Starling) is an automation solutions provider and manufacturer of bespoke LV control systems including both conventional and intelligent motor control centres, switchboards, package substations, containerised equipment and instrumentation panels. The company has extensive systems integration capability including MIS/MES, SCADA and PLC programming. Scope of supply includes site surveys, full in-house design and technical support service, project management, product manufacture (including metal fabrication), software programming, test, installation, commissioning, training, maintenance, equipment refurbishment and modification. RSE Controls (Blackburn Starling) is a well respected company with a trading history of almost 150 years. The company offers an unrivalled combination of experience and capability and is a major provider of motor control centres into the United Kingdom. RSE Controls (Blackburn Starling) has supplied its products and services into the water sector in the UK for more than 50 years and has Framework Agreements directly with many UK Water PLCs. The company has an excellent reputation within its industry sectors and is renowned for being reliable and honourable. RSE Controls (Blackburn Starling) is located on a 4 acre site in the Midlands area of the UK. The company operates its own design and manufacturing facility and a key strength of the company is the provision of complete in-house capability to cover all aspects of design, metal fabrication (including laser cutting), paint, assembly, copper, wiring, testing, delivery and installation (using our own hi-ab equipped lorry), commissioning, maintenance and training, ensuring we have full control of the design and manufacture of the entire scope of works. Product innovation and technical excellence are paramount and tailoring control systems to the special needs of its customers is RSE Controls (Blackburn Starling)’s greatest strength.

    Networks - Water Supply
    Contractors
    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
    TerraTank® logo

    TerraTank®

    United Kingdom

    TerraTank® is a nationwide supplier of modular, scalable, plug-and-play, rental storage tanks and associated equipment. TerraTank is a nationwide supplier of rental storage tanks and associated equipment, for planned or reactive projects. With a comprehensive range of innovative modular storage tank equipment, TerraTank provides in excess of over 15 million litres of capacity, with the ability to scale and customise to support your liquid management challenges. Our modular, scalable, plug-and-play tanks offer capacities ranging from 10,000 to 70,000 litre with enclosed/open top, mixer, heater and pump options for your perfect solution. Designed to enable rapid deployment and flexible configuration to meet site-specific operational needs.

    Site Preparation
    Accreditations
    Ward & Burke Construction Ltd logo

    Ward & Burke Construction Ltd

    United Kingdom

    Ward & Burke is an Engineering Organisation delivering and operating infrastructure, primarily sanitary services infrastructure, on a turnkey design, build and operate basis. Engineering disciplines encompass: civil, structural, mechanical, electrical, environmental, process, automation & control. Since our formation in 2001, we have been focused on delivering integrated solutions from design through to construction and commissioning stages. Our work is delivered directly by our in-house team of construction professionals. W&B currently has upwards of 1,200 direct employees, to include staff and workforce, working across Ireland, the UK, Canada and the USA. We operate a self-delivery business model where all the significant resources required are available in-house. This includes back office, yard and fabrication facilities strategically located throughout each country; MEICA and civil/structural design capability to include both permanent and temporary works; MEICA and civil/structural construction and delivery teams; commissioning teams and operations teams. Our international workforce prides itself in its ever-evolving commitment to health and safety, research and development, innovation, quality, teamwork, environmental responsibility, and integrity. These values define who we are as a Company, and we strive to reflect these values through our day-to-day work.

    Reservoirs - Raw Water
    Contractors
    Aquability OPS Ltd logo

    Aquability OPS Ltd

    United Kingdom

    Aquability OPS Ltd was established in 2015 and is a leading technical consultancy providing optimised process solutions in the wastewater treatment industry. We are trusted partners of water companies, contractors and consultants and a member of British Water - the trade body representing the supply chain to government and the water companies. Director, Nicola Henderson is a chartered Chemical Engineer with over 27 years experience in the water industry and is one of the UK’s leading SBR experts. She is well known in the industry and previous tenures include Director of British Water and Chairman of British Water’s Technical Forum and Municipal Group. After graduating from Bath University in 1990 with a degree in Chemical & Bio Process Engineering, Nicola started her career in wastewater treatment at British Steel, responsible for the operation of their water and wastewater treatment systems. She then spent 24 years working in the design and build arena where she gained widespread experience in the water industry across a number of fields. Aquability OPS draw on Nicola’s extensive experience to offer technical expertise and bid support in both municipal and industrial wastewater treatment. We combine a mix of technical knowledge and practical application, providing comprehensive, tailored services across four areas to provide: Process expertise to solve our clients’ wastewater treatment challenges. Leading SBR expertise to ensure your SBR plant is a success. Commissioning and operational support for effective commissioning and trouble free operation. Bid support to develop innovative cost effective solutions, focused and persuasive bid writing and creative, engaging presentations. Our services help our customers to win work, build knowledge, reduce delivery and operating costs and avoid compliance issues. Our goal is to deliver successful outcomes for our Clients and develop trusting and long lasting relationships.

    Designers
    EE

    Eragon Enviro Tech. (Xiamen) Co., Ltd.

    Verified
    China51-200 employees
    Reverse Osmosis (RO) · Inclined Plate Settlers (Lamella Clarifiers)
    china · apac · europe

    Eragon Enviro Tech (Xiamen) Co., Ltd. is a specialized provider of industrial water and wastewater treatment solutions, supporting engineering teams, EPC contractors, and industrial clients in solving complex water challenges. We focus on process design, system integration, equipment manufacturing, and modular system supply for industrial wastewater treatment, water reuse, ultrapure water (UPW), and advanced ZLD/MLD applications. Our solutions are applied across semiconductor, electroplating, electronics, and new energy industries, as well as other industrial sectors dealing with complex wastewater streams. We help clients improve system reliability, optimize process stability, reduce operational risks, and meet stringent discharge and reuse standards in demanding industrial environments. With in-house engineering capability and manufacturing strength, we support global partners from design to execution for high-performance water treatment systems.

    mining-quarrying
    chemicals-pharmaceuticals
    Active Tunnelling Ltd logo

    Active Tunnelling Ltd

    United Kingdom

    As an industry leader since 1994, Active Tunnelling Ltd (ATL) is the UK’s most experienced independent, micro-tunnelling, auger boring, shaft sinking and pipe jacking company offering a comprehensive range of services to the water and civil engineering industries across the UK & Ireland. More than just a tunnelling company ATL delivers all encompassing projects solutions: whether it is a segmental shaft or complete project management from ‘tunnel’ to final landscaping, ATL delivers flexible, and tailor made solutions to suit any brief. ATL prides itself on its long list of clients that includes amongst others the UK’s leading construction companies and is proud to claim total satisfaction on every job. A dedicated and highly skilled/experienced sixty strong team are at the core of ATL’s success, this weight of experience backed by the UK’s largest independent specialist plant enables ATL to deliver on time every time. Services Our comprehensive range of services allows us to satisfy even the most demanding brief, even with short lead times you can place your trust in us leaving you to focus on other aspects of the project. Tunnelling and pipejacking: 1,000mm – 2,400mm diameter. Micro-tunnelling: 150mm – 900mm diameter. Auger boring: 150mm – 725mm diameter. Grouting. Shaft sinking. Cover slab construction. Timber headings. ATL offer Professional management team with over 30 years experience. Quick mobilisation to site. Technical support/design where required. Achilles UVDB Verify approved company. Quality Assured ISO 9001:2008 Registered Firm Cert. No. A11969. Fast response to enquiries. Fast and efficient service maintaining a high standard of safety. Specialist trenchless plant. A completed project to a high quality at a reasonable price. A willingness to work as one team with all parties to ensure satisfaction.

    Networks - Water Supply
    Contractors
    Circle Control logo

    Circle Control

    United Kingdom

    Established in 1995, Circle Control part of the Empower Group, is a trusted electrical contracting company based in Snaith, near Selby. For over 30 years, we’ve been delivering LV electrical installation solutions across the utility and renewable energy sectors, combining technical expertise with an unwavering commitment to safety, quality, and environmental responsibility. Originally focused on the Water Industry, we’ve since expanded into Renewable Energy, supporting clients on the UK’s journey towards a more sustainable and resilient future. Our approach is straightforward, cost-effective, compliant, and built on decades of engineering know how. We are NICEIC approved, ISO 9001 accredited with Citation, and proud members of the Achilles Utilities Vendor Database (UVDB) and Constructionline. Our skilled team holds a wide range of industry certifications, including CSCS/ECS, EUSR, Confined Space, Compex, Asbestos Awareness, First Aid, PASMA, and IPAF, ensuring safe, compliant delivery across every project. As part of the Empower Group, we’re proud to combine long standing technical excellence with a forward-looking focus on innovation and sustainability, helping clients reduce environmental impact, improve operational efficiency, and future-proof their infrastructure.

    Networks - Sewerage
    Contractors
    EPS Water logo

    EPS Water

    United Kingdom

    EPS Water offers the market a unique end-to-end service, ranging from needs assessment and solution definition, through design, manufacture, installation & commissioning, to aftercare and operation of water & wastewater treatment assets. Our experience of operating and maintaining treatment systems helps to drive excellence in design and to ensure that our manufactured equipment is robust and reliable at all times. EPS offers a broad range of services across the UK regulated & industrial and global export water and wastewater treatment markets: Wet infrastructure support services. Design-Build (DB) and Design-Build-Operate (DBO) of water and wastewater treatment facilities. Biological process technology supply. Product manufacture & installation. Engineering Services including process and MEICA design, asset optimisation and energy management. Our focus is primarily on providing Best Value to our clients and their bill-paying customers at all stages of the project lifecycle. Our digital design capabilities extend beyond 3D to fully animated 4D including digital rehearsals and we are well-advanced on our journey to BIM Level 2. As treatment plant operators ourselves, we endeavour to live the culture of our clients and to ensure that our solutions provide best Whole Lifecycle Cost in operation. We offer a leading After Sales Service and a range of asset optimisation services to ensure that the performance of the solutions we provide does not deteriorate over time.

    Networks - Water Supply
    Contractors
    Glenfield Invicta Ltd logo

    Glenfield Invicta Ltd

    United Kingdom

    From concept to completion, Glenfield Invicta’s end-to-end Project Solutions provide market leading valve and penstock engineering excellence, across a multitude of water utility and non-water utility infrastructure projects. The company combines the strength and unique proposition of Invicta’s site solutions, penstocks, and environmental expertise, with Glenfield’s experience and expertise in specifying and managing large Dams, Reservoirs and Hydropower projects. Supported by the vast product portfolio from the AVK Group of manufacturing companies. We are market leaders distinguished by our industry expertise, we have been designing and manufacturing specialist engineered valves and penstocks for more than 170 years. We stand behind every product we install for life, offering some of the best extended warranties in the industry. Our experienced and multi-skilled project team work closely with our partners and key stakeholders to ensure your project is executed to exacting standards. Our long history in designing, supplying, and installing highly engineered valves and pipeline equipment in projects is what sets us apart. Our projects are delivered safely, on time, and to the highest standards in arduous applications. This specialist capability has made the our brands synonymous with engineering excellence worldwide. We have recently invested over £2m in our Kilmarnock facility which extends to over 200,000 sq. ft. of manufacturing, office, warehousing, and education space. It includes a new purpose-built Learning Academy; which will include an interactive visitor centre. We are committed to training the apprentices and engineers of the future.

    Project Planning & Surveying
    Designers
    Intelect logo

    Intelect

    United Kingdom

    At Intelect, we have over 25 years experience in providing engineering expertise to clients in process industries. Intelect have worked with Northumbrian Water and its Tier 1 suppliers and partners for over a decade, and during this time, we have provided services in design, electrical installation, control panels and pipework services. Our attention to detail, quality, and attitude to Health and Safety has been consistently recognised by our clients over the years, with us receiving numerous awards for the projects we have completed. Our flexible workforce of apprentices, engineers and project managers allows us to efficiently complete any project to our client’s requirements. On-going innovation and investment in our business means that we have the latest training and technology to execute high quality engineering projects, from design through to commissioning, all whilst maintaining best practices in Health and Safety. Intelect are committed to working in partnership with both contractors and suppliers within the utility sector, sharing our expertise and knowledge to help support companies who provide utilities to homes and businesses across the North East and the rest of the country.

    Networks - Water Supply
    Contractors
    Mabey Hire Ltd logo

    Mabey Hire Ltd

    United Kingdom

    Your experts in temporary works - For over 60 years, Mabey Hire have been using its skills and experience to help customers deliver essential water and wastewater infrastructure projects. We’ve played our part in delivering new infrastructure projects, new rural treatment services and in maintaining our rivers and canals. So, whether it’s a planned infrastructure spend on improving our water utilities or managing our flood and coastal defences and our network of rivers and canals, we can deliver the right solution. We can help at every stage of your project, from early stage planning, design and tender submission through to supply and, if you need it, installation. We have the widest range of temporary works equipment, covering groundworks support, propping and jacking, temporary bridging and access, formwork, falsework and monitoring.

    Contractors
    Cofferdams
    Saint Gobain PAM UK logo

    Saint Gobain PAM UK

    United Kingdom

    Saint Gobain PAM UK is the premier supplier of ductile iron and cast iron products to the UK's key utilities, telecoms, highways, civil engineering, construction and housing companies. We’re a leading manufacturer of ductile iron access covers, gully gratings, and pressure pipeline systems, helping the UK’s utility, highways, telecoms and infrastructure network owners reduce their whole-life costs and carbon while improving their asset durability and health and safety standards. We proudly manufacture our solutions, which enables us to not only meet but exceed the most stringent safety, quality and environmental standards. This means all of our access covers, gully gratings, and surface boxes are 100% recyclable. By providing innovative and sustainable access covers, gully gratings and pipeline systems that are right the first time, our customers enjoy quality and durable solutions that solve their problems the first time they’re installed – backed by the experts who designed them. 👨‍🔬🔬🥼 Saint-Gobain PAM UK is part of the Saint-Gobain Group, which employs over 166,000 people in 75 countries. With the international support of parent company Saint-Gobain, we offer unrivalled technical support, a total solution approach and unparalleled quality and innovation. Our solutions include: Ductile iron access covers, gully gratings and kerbside drainage solutions Ductile iron water and sewer pipes, fittings, valves, couplings and adaptors

    Treatment Works Products/Services
    Networks - Sewerage

    Water and Wastewater Operation and Maintenance Services: Contract Models, KPIs, and Asset Performance

    Operation and Maintenance (O&M) services for water and wastewater treatment facilities span routine operations (process control, chemical dosing, sampling, data recording), planned preventive maintenance (PPM: servicing pumps, valves, instruments, and rotating equipment on schedule), reactive maintenance (breakdown response, emergency repair), and performance management (KPI monitoring, regulatory compliance reporting, asset condition tracking). O&M contract models range from in-house operation (utility employs its own operations and maintenance staff) through managed service (external contractor provides staff and manages O&M under performance contract) to full design-build-operate-transfer (DBOT: contractor designs, builds, and operates for a concession period of 15 to 25 years before handback).

    PPM programmes for water treatment assets are structured around equipment criticality and manufacturer recommendations. Pumps: oil/grease lubrication quarterly, mechanical seal inspection 6-monthly, vibration analysis 6-monthly (predictive maintenance trigger: vibration velocity above 4.5 mm per s RMS per ISO 10816-3 Class III), impeller inspection and clearance check annually. Blowers and compressors: oil change 3 to 6-monthly, air filter replacement 3-monthly, belt tension check monthly (V-belt tension tolerance plus or minus 5 percent). UV systems: lamp intensity check weekly, sleeve cleaning monthly, lamp replacement at intensity below 70 percent of new-lamp value (typically 12 to 24-month lamp life). Membrane systems: CEB weekly, CIP quarterly, integrity testing daily or monthly per regulatory requirement.

    O&M contract performance is measured by KPIs aligned with regulatory compliance and customer service. Typical KPIs: treatment process compliance (effluent quality parameters within consent limits, target 99.5 percent compliance), uptime or availability (proportion of time the treatment plant is operational and producing treated water at rated capacity, target above 99 percent for critical infrastructure), response times (PPM completion within schedule: 95 percent on time; reactive maintenance response: critical faults within 2 hours, minor within 24 hours), and unit cost (cost per m3 of water treated, benchmarked against industry database). Performance-based contracts include KPI-linked payment (bonus for outperformance, financial deduction for underperformance), creating incentive alignment between operator and asset owner.

    Frequently Asked Questions

    What does a water treatment O&M contract typically include?

    A comprehensive water treatment O&M contract covers: (1) Routine operations - process monitoring and control (SCADA observation, manual readings every 4 to 8 hours, process adjustments), chemical dosing management (ordering, receiving, dosing pump calibration and setpoint management), statutory sampling and analysis (daily, weekly, monthly per licence and consent conditions); (2) Planned preventive maintenance - all scheduled maintenance activities per PPM schedule (pump services, filter backwashes, instrument calibrations, UV lamp replacements); (3) Reactive maintenance - attending and resolving breakdowns, fault investigations, emergency call-out 24/7; (4) Regulatory compliance management - record keeping, licence reporting, Drinking Water Inspectorate (DWI) or Environment Agency submissions, corrective action when parameters approach limits; (5) Asset management inputs - condition assessments, capex recommendations, lifecycle planning support. Contract duration: 3 to 5 years for managed service; 15 to 25 years for DBO/DBOT.

    What is the difference between PPM and reactive maintenance?

    Planned Preventive Maintenance (PPM) is maintenance carried out on a time-based or condition-based schedule to prevent equipment failure before it occurs: oil changes, seal replacements, filter cleaning, calibration checks, and vibration monitoring conducted at fixed intervals (daily, weekly, monthly, annually) regardless of whether the equipment shows signs of failure. The cost of PPM is predictable and budgeted. Reactive maintenance (corrective maintenance, breakdown maintenance) is carried out in response to an equipment failure or fault: emergency pump repair after bearing failure, UV lamp replacement after unit alarm, valve repair after gland leak. Reactive maintenance costs are unpredictable and often significantly higher than PPM due to emergency contractor call-out rates, expedited spare parts, and production downtime costs. Industry target: PPM should represent 80 percent or more of total maintenance hours; reactive below 20 percent. A well-executed PPM programme reduces reactive maintenance frequency, overall maintenance cost, and unplanned downtime.

    How is O&M cost benchmarked for water utilities?

    O&M cost benchmarking uses: (1) Unit cost metrics - cost per m3 of water produced ($0.15 to $0.60 per m3 for conventional drinking water treatment; $0.30 to $1.20 per m3 for advanced treatment including membranes and UV); cost per population equivalent served per year ($50 to $150 per PE per year for WWTP O&M); (2) Industry database benchmarks - Ofwat cost benchmarking model (UK) uses totex (total expenditure) benchmarking across all 17 regulated companies to identify relative efficiency; NACWA utility benchmarking (US) for wastewater; AWWA benchmarking programme for water; (3) Process-specific benchmarks - aeration energy 0.3 to 0.6 kWh per kg BOD removed (activated sludge); chemical cost $0.05 to $0.20 per m3 for coagulation (surface water); UV energy 0.02 to 0.05 kWh per m3 at 40 mJ per cm2; (4) Labour productivity - staff hours per ML treated per day; automation and remote monitoring reduce staffing requirements by 20 to 40 percent versus manually operated plants.

    What qualifications are required to operate a water treatment plant?

    Operator qualification requirements vary by jurisdiction and plant type. UK: Water Industry Registration Scheme (WIRS) - competency-based registration for drinking water treatment (Level 3 to Level 6 WIRS qualification depending on plant complexity: Level 3 for simple groundwater, Level 6 for multi-stage surface water treatment including membranes and advanced oxidation). Environment Agency requires qualified operators for WWTP discharge permits. US EPA: state-issued drinking water and wastewater treatment operator certification required in all 50 states; grades T1 to T4 for treatment, D1 to D4 for distribution (AWWA certification framework); minimum grade required determined by plant complexity and population served. EU: no harmonised EU requirement; member states set national qualification requirements. Operator training programmes: CIWEM (UK), WaterNZ, AWWA, and state water environment associations provide technical training courses and competency assessments.

    Case Study·Industrial water utility, multi-site O&M contract, Yorkshire
    Challenge

    A chemicals group operating five process water treatment plants across two Yorkshire sites was managing O&M in-house with a team that had accumulated significant tribal knowledge but no documented PPM programme. A CQC audit found 34 percent of planned maintenance overdue, three critical chemical dosing pumps without service records, and one UV system operating below 70 percent lamp intensity without an alarm.

    Approach

    An O&M managed service contract was awarded following a competitive tender. The incoming operator completed an asset condition survey across all five plants within 60 days, loaded all assets into IBM Maximo CMMS, and built a 12-month PPM schedule aligned with manufacturer intervals and BS EN 13306. Critical spare parts were identified and minimum stock levels agreed with the client. A SCADA alarm rationalisation exercise reduced nuisance alarms from 240 per month to 38.

    Outcome

    PPM completion rate reached 97 percent within six months. The three critical dosing pumps were serviced and calibrated; UV lamps were replaced and intensity verified at 100 percent. Total reactive maintenance incidents fell by 58 percent year on year. The client reported zero regulatory compliance failures in the first 24 months of the contract.

    Questions to Ask Shortlisted Providers

    1. 1

      What is the scope boundary between O&M (revenue spend) and capital maintenance (capex), and who authorises capex works?

      An ambiguous capex/opex boundary creates disputes when major repairs are needed; the contract must define decision rights and approval thresholds clearly.

    2. 2

      What CMMS platform will be used and who owns the asset data at contract end?

      Asset data and maintenance history have long-term value; the client should retain data ownership and confirm export rights in the contract.

    3. 3

      What KPIs apply and what are the financial consequences of underperformance against each?

      KPI-linked payment structures vary widely; understanding which KPIs carry financial penalties versus warnings is essential for pricing risk.

    4. 4

      What is the minimum response time for a critical process failure and what is the out-of-hours call-out protocol?

      24/7 cover for critical water treatment assets usually requires a separate standby rota and remote monitoring; the cost of this cover must be explicit in the contract price.

    5. 5

      What regulatory submissions is the O&M operator responsible for and who carries liability for a compliance failure?

      DWI and EA submissions carry legal liability; the contract must clearly allocate responsibility between operator and asset owner for each compliance obligation.

    What Drives Cost in This Category

    Number of assets and plant complexity

    PPM labour hours scale directly with asset count and complexity; a five-plant contract with 200 major assets requires 3 to 5 full-time equivalent operators, dominating the fixed contract cost.

    24/7 standby and response requirement

    Out-of-hours standby cover for critical infrastructure adds 20 to 40 percent to base O&M cost; response time commitments of 2 hours or less require dedicated local standby personnel.

    Chemical supply and management

    Chemical procurement and dosing management can represent 15 to 25 percent of total O&M cost; consolidated purchasing through the operator may reduce unit costs by 5 to 15 percent versus client self-supply.

    Regulatory reporting and laboratory analysis

    Statutory sampling, accredited laboratory analysis, and DWI/EA reporting add 30,000 to 120,000 GBP per year depending on permit complexity and sample frequency.

    Key Regulations & Standards

    Water Industry Registration Scheme (WIRS)

    Competency-based operator registration for drinking water treatment; Level 3 to Level 6 qualifications required depending on plant complexity; all operators at regulated water company sites must hold appropriate WIRS registration.

    DWI Regulation 28 (WS(WQ)R 2016)

    Requires water companies to notify DWI of failures against prescribed concentrations or values; the O&M operator must have documented escalation procedures to trigger notification within the required timescales.

    EA Environmental Permit (Operator Competency)

    Environmental permits require the operator of a regulated site to demonstrate sufficient competency; the O&M contractor assumes the operator role and must meet the technical competency conditions of the permit.

    BS EN 13306:2017 (Maintenance Terminology)

    Provides standardised definitions for PPM, corrective maintenance, condition-based maintenance, and reliability-centred maintenance used in O&M contracts; alignment with this standard avoids scope disputes.