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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    Costain logo

    Costain

    United Kingdom

    Costain works with water and wastewater companies to shape, create and deliver pioneering solutions that improve water quality, affordability and resilience. Population growth, regulatory changes, energy costs and climate change are having a dramatic impact on water usage. The national approach to managing water supply is changing to meet these challenges. The Government and industry regulator are tasked with cutting wastage and preserving an increasingly valuable resource, while protecting consumers from higher water bills. The water sector team offers: Expert input into consultation documents, close work with Government and water companies and innovative delivery, all of which help to minimise costs to water users while meeting national investment needs. A manufacturing mindset: programme optimisation advisory services, standard product development, production controls, whole-life costing and lean delivery processes. Cross-sector best practice: we provide value for our clients by drawing on experience from across the company and by working closely with our decarbonisation experts to drive regional growth strategies. Technology integration: working with some of the UK’s leading asset and data analytics organisations we analyse large volumes of real time data to create greater benefits for our customers through optimised maintenance, pump operation, energy and chemical usage. Current water industry frameworks: Anglian Water – Strategic Pipeline Alliance Severn Trent Southern Water – CMDP JV Thames Water United Utilities – Maintenance Service Provider Yorkshire Water – Technical Services

    Programme Management
    Contractors
    Glanua Group logo

    Glanua Group

    United Kingdom

    Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build and operate critical water and wastewater infrastructure across Ireland and the UK. Glanua is passionate about solving today’s environmental challenges and delivering a decarbonised and sustainable world. At Glanua, we design, build, operate, and maintain innovative water and wastewater solutions that protect the environment and support the people who depend on them. Sustainability is at our core — it’s why we innovate, how we work and the future we’re building. We’re reimagining how the world treats water, using cutting-edge technology, smart design and fresh thinking to deliver cleaner, greener results for both industry and the public sector. With global ambitions and a track record of turning ideas into reality, we’re on an exciting journey of growth and impact. Glanua are a partner to major water utilities in Ireland and the UK, including Uisce Éireann (formally Irish Water), Thames Water, Yorkshire Water, Affinity Water and Northern Ireland Water. In the industrial sector, their clients include prominent names such as ABP, Glanbia, Kerry Group, and other key players in the food and beverage, pharmaceutical, and distillery industries. Core Values Glanua lives by our core values, including Safety and Well-being, Innovation, Integrity, Collaboration, Courage, Agility, Accountability, Diversity, and Inclusion. These values guide our actions and decisions, ensuring that we uphold the highest standards in everything we do. Our talented team comprises over 500 professionals across Ireland and the UK. Our UK office is headquartered in Hertfordshire and we also have offices in Reading, Sheffield, Northern Ireland, Galway and a manufacturing facility in Navan, Co Meath. Sustainability At Glanua, we understand the vital role we play in ensuring the delivery of safe and high-quality drinking water, as well as the proper treatment of wastewater before it is discharged into the environment. Committed to building today without compromising the environment for future generations, sustainability lies at the core of what we do. To strengthen our commitment, we have partnered with Earthshine, a leading sustainability consultant to develop our sustainability strategy that aligns with our values and ensures that every engineering solution we deliver contributes to a greener and more sustainable world. Future growth Glanua is on a growth trajectory, with ambitious plans to reach €400 million in the next five years. As we continue to expand our capabilities and service offerings, we remain committed to being at the forefront of sustainable engineering solutions, driving positive change in the water and wastewater infrastructure landscape in Ireland, UK, and internationally. Our growth is evident in the recent expansion of our team by over 150 people in 2023, bringing our total workforce to over 500 people. In 2024, we acquired O&M specialist company, Aqua Operations and in 2025, we acquired Anaerobic Digestion specialist company, Marches Biogas building a complete solutions provider in Water, Wastewater and Bioresources.

    Networks - Water Supply
    Contractors
    Greenbank Group logo

    Greenbank Group

    United Kingdom

    A specialist engineering company with a global customer base. Greenbank provides a wide range of products and services to companies operating across a number of industries and is now establishing itself in the clean and wastewater sector. For many years the company has utilised the unique properties of volcanic basalt for lining products used in heavy industries such as power generation and minerals extraction. In partnership with Czech firm Eutit, the company has also been pioneering the use of basalt in the renovation and restoration of sewer systems in central European following a series of successful projects in Prague. As a result of devastating floods, the city’s sewer system was extensively rebuilt and upgraded with basalt being used in a number of key locations to provide a new level of security to the system. More than a decade on, the new system continues to perform well and has set a standard that’s now been followed in other European cities. Well suited for the most demanding of applications, thanks to the partnership between Greenbank and Eutit, a wide range of basalt solutions are now available in the UK market. These include products and systems that bring a wide range of benefits to the industry, including: Basalt tiles that can also be used to line existing brickwork, a more cost-effective solution than full replacement, and their reduced drag co-efficient means improved flow – in effect a smaller-diameter pipe or tunnel lined with basalt can carry a higher volume of water than a larger one with traditional brick surfaces. The effective life expectancy of basalt-lined sewer systems is between 100 and 200 years, thanks to their excellent resistance to abrasion and chemical damage – as well as the rigours of high-pressure water jetting that’s often used to clear unwanted blockages. For larger round or ovoid systems, basalt can be used in the lower sections to deal with the wear and tear with concrete upper sections to provide optimum life performance. Alternatively, steel pipes lined with basalt can be produced up to 3000mm diameter producing a lighter therefore lower cost installation option to thick wall concrete. Ease of installation and reduced maintenance costs make basalt ideal for bottom gutters, branch pipes and tubes and slip-resistant elements for walkways, and Greenbank can also supply bespoke-shaped tiles to meet the unique requirements of individual clients. With manufacturing facilities in Derbyshire and Nottinghamshire, supported by the additional capacity and expertise provided by the latest addition to the group, Franklyn Yates Engineering, Greenbank is well placed to react quickly and efficiently to the needs of new and existing clients.

    Industrial Pipework Services logo

    Industrial Pipework Services

    United Kingdom

    At Industrial Pipework Services, we provide bespoke engineering services. With over 25 years’ experience IPS can offer complete mechanical engineering solutions including design, manufacture & installation services. Our experienced workforce are trained to the highest standards. IPS is situated within easy access to the M4 corridor approximately 30 minutes North of Cardiff. The company embraces innovative thinking while utilising the latest technology. IPS operating base comprises of 30,000 square foot of workshops, offices and assembly areas.  The Workshops are fully segregated for the manufacture of both carbon steel and stainless-steel products and are serviced by dedicated overhead gantry cranes. With over two decades of engineering experience the company strives to combine first class engineering and design to deliver the high quality that is required.  The Company maintains a proactive approach, working closely with our Clients to achieve our collective aims for each scheme. This ambition is underpinned by an uncompromising commitment to attain the highest standards of health, safety and environmental care. IPS provides continued excellence in design, manufacturing and installation gained from many years experience within the industry. Our In-House design capability allows the company to provide a full engineering design service using the latest Auto CAD software packages. IPS offers a design service for both pipework and steelwork systems from proposal drawings to the production of as built drawings. IPS Design Office provides all relevant AutoCAD drawings for steelwork and pipework, Isometric drawings for fabrication, general layout drawings for plant and equipment and As Built drawings. Structural steelwork calculations and flow characteristics are also provided as required. IPS offer a full 3D surveying services and production of cloud point data for project modelling. IPS operates primarily within the Water Industry and provides services for both clean water and sewage. IPS is a Tier One Mechanical Engineering Specialists Provider to Dŵr Cymru Welsh Water and the Strategic Alliance. IPS operate nationally and have delivered projects throughout the UK for many Water Utility companies including Anglian Water, Thames Water and Bristol Water. Continual improvement into our infrastructure and the development of new IT systems has brought us to a level consistent with the requirements of our clients. IPS offers a complete project management service, including operation of Principal Contractor role as well as delivering turnkey projects. Experience gained in the water industry has enabled us to manage the competing demands of cost, quality and safety for all our projects.

    Networks - Water Supply
    Contractors
    KGN Pillinger logo

    KGN Pillinger

    United Kingdom

    Advanced Pumping & Engineering Solutions With a heritage dating back to 1926, KGN Pillinger is a trusted partner in engineering and manufacturing advanced pumping solutions for the UK’s critical water infrastructure. We combine decades of experience with a progressive investment in technology to deliver robust, reliable, and compliant systems designed for long-term performance. We specialise in the design and in-house manufacture of water and wastewater pumping equipment built to withstand the demands of the water sector. Our proven resilience and expertise have made us a trusted supplier to major UK Water Utilities and the Ministry of Defence. Capabilities Our core capabilities include: Bespoke water boosting systems for network resilience. Packaged pumping stations for sewage and wastewater management. Durable pumping equipment engineered for all sectors. Integrated lifecycle support and maintenance services. Design & Manufacturing Excellence Our end-to-end project management ensures quality and accountability from concept to commissioning: Advanced 3D CAD Design and Building Information Modelling (BIM) support for seamless project integration. In-house fabrication and assembly using 316L Stainless Steel as standard for superior corrosion resistance and asset longevity. A state-of-the-art, fully equipped UK manufacturing facility ensuring quality control and supply chain security. Lifecycle Support for Critical Infrastructure Our dedicated Service Division ensures the operational reliability of your assets: Emergency support and nationwide services to ensure uninterrupted service. Professional installation, commissioning, and planned maintenance contracts. All KGN engineers are CSCS certified, CRB checked, and trained for confined space work, ensuring safe and compliant service on critical infrastructure sites. KIWA Certification KGN Pillinger is the only UK company holding KIWA certification for both: Above-ground AV and EV variable speed booster sets. Below-ground UPOD Underground Plant Room. This dual certification underscores our commitment to meeting the highest industry standards for quality, compliance, and energy efficiency. To discuss your specific project requirements, contact our engineering team: 📞 0208 681 0097 | 📧 sales@kgnpillinger.com | 🌐 www.kgnpillinger.com

    Health & Safety
    Accreditations
    Specialist Plant Associates logo

    Specialist Plant Associates

    United Kingdom

    The trusted partner in equipment hire and engineering services Specialist Plant Associates (SPA) has been setting the standard for equipment hire and engineering services in the tunnelling, construction, and civil engineering sectors for over 35 years. As part of the Joseph Gallagher Group, SPA is renowned for delivering reliable, high-quality equipment backed by unmatched expertise and dedicated customer support. Our extensive fleet, including one of the UK’s largest selections of ventilation fans and our in-house designed air-powered grouting systems, has been instrumental in supporting complex projects across the UK and internationally. Designed for durability and performance, our equipment is built to meet the challenges of even the most demanding environments. Why Industry Leaders Work with SPA Extensive inventory: A comprehensive range of reliable equipment, ready to meet the needs of diverse projects. Tailored solutions: Bespoke services, from site assessments to equipment customisation, ensuring the right fit for every project. Proven expertise: Decades of experience combined with deep technical knowledge and innovation. Reliable delivery: Rapid, next-day delivery across the UK, with same-day options available for key items. Delivering Quality, Innovation and Reliability for Every Project SPA combines innovation, experience, and customer focus to provide dependable equipment and services that help projects succeed. By offering robust solutions tailored to individual needs, SPA ensures clients can complete projects efficiently, safely and on schedule. Our commitment to quality and reliability has earned us the trust of leading contractors and engineering firms. From small-scale operations to large infrastructure projects, SPA delivers the expertise and equipment needed to achieve outstanding results.

    Construction Plant & Equipment
    Storage Shafts
    Medio Industries Private Limited logo

    Medio Industries Private Limited

    Verified
    India1-50 employees
    Granular Activated Carbon (GAC) Filters · Ion Exchange · Multimedia Filters +1 more
    mea · apac

    MEDIO is committed to the installation and servicing of water filtration systems and purifiers. Our initial venture into the water filtration industry began with Kent Water Purifiers and later expanded to encompass whole-house filtration systems and, subsequently, commercial ranges. As a company, MEDIO consistently stays abreast of the latest technologies, filtration methodologies, and advanced filtration mediums. This proactive approach has enabled us to build a robust network with multiple sales and service points. We uphold the principle of providing "Value for Money," prioritizing customer requirements. This customer-centric policy has cultivated significant trust, resulting in repeat orders and referral sales. Our continuous investment in training our staff in sales and operations reflects our commitment to achieving the desired work quality. We view quality as a habit and dedicate our utmost efforts to manifest it in both our products and services. Mission: Our goal is to achieve industry leadership in water filtration products by capturing the majority of the Iron removal medium market in India. Additionally, we aim to pioneer the introduction of energy efficient and water-saving filtration products that enhance water quality and minimize wastage.

    energy-production
    manufacturing
    AUMA Actuators Limited logo

    AUMA Actuators Limited

    United Kingdom

    Based in Clevedon, near Bristol, North Somerset, AUMA Actuators Limited is the UK subsidiary of the global AUMA Reister GmbH and Co., the world’s largest manufacturer of electric valve actuators, operating on every continent, with 2,300 employees in 30 locations. AUMA Actuators Limited is the UK arm of global manufacturer AUMA Reister GmbH, manufacturing daily over 500 electric actuators for valves, penstocks and dampers. A trusted supplier to the UK water and wastewater industry, AUMA holds supply and maintenance frameworks with all major UK water companies. With a UK-based team of experts and a £2.5 million inventory held locally, AUMA ensures rapid response and fast-track call-off for urgent project requirements. AUMA provides electric actuators – including variable speed, explosion-proof and underwater variants – plus gearboxes for flow control across water and wastewater networks, backed by comprehensive service, maintenance, and support tailored to the specific needs of the UK water sector. Key Products • SQ and SA part and multi-turn actuators for Class A and B operation, torques from 10 Nm to 32,000 Nm extendable to 675,000 Nm with optional gearboxes. • SQR and SAR modulating actuators provide Class C control up to 1500 starts/hr. Torques from 15 Nm to 2,400 Nm depending on model chosen. • SQV and SAV variable speed actuators provide accurate close control of valve position and flow rate, with soft-open and soft-close ability that protect ageing assets while retaining speed of operation and emergency functions. Tripping torques from 10 Nm to 1000 Nm. Modulating versions SQRV and SARV are also available • Profox – compact actuators for part- and multi-turn applications – easy to set up, reliable and tough, for torque ranges up to 600 Nm (part turn) and 100 Nm (multi-turn) For explosive atmospheres, AUMA actuators are available with full ATEX certification. Please ask us for details. AUMA equipment is built for the digital world. Full Fieldbus integration, the ability to integrate and consolidate other plant signals and bidirectional control makes AUMA an ideal project partner, while the modular approach and versatile configuration of AUMA equipment makes it ideal when you are considering automation of existing assets.

    Reservoirs - Treated Water
    Accreditations
    Bluewater Bio logo

    Bluewater Bio

    United Kingdom

    Bluewater Bio (BwB) is an award winning global specialist in technologies for cost-effective water & wastewater treatment. Headquartered in London, BwB’s range of best in class technologies have been deployed at over 100 sites globally. Next generation proprietary technologies With two fully commercialised technologies proven at utility scale, complemented by an active New Product Development pipeline, BwB’s capabilities now include: HYBACS (enhanced activated sludge process). FilterClear® (high throughput multi-media filtration). GHG-Tox® (nitrification and greenhouse gas monitoring). CFIC® (highly efficient UV system). Operational & Maintenance services (supporting a population equivalent of c. 1 million). World Class R&D team, based at Cranfield University, UK. Targets & goals BwB’s growing technology portfolio is focused primarily on the rapid upgrading, optimisation and monitoring of water and wastewater treatment plants. The company has a particular emphasis on reducing: Capital, operational and compliance costs. Energy & chemical consumption. Physical & environmental footprint. Greenhouse gas emissions. Construction and commissioning times. Combining its R&D expertise with a highly entrepreneurial business approach, Bluewater Bio not only develops its own innovations but also scours adjacent markets for complementary IP, licence opportunities and partnerships. Through this aggregation strategy, Bluewater Bio aims to be the natural choice for cost effective treatment, re-use and monitoring provision across the water, wastewater and process industries.

    Designers
    Bollfilter UK Limited logo

    Bollfilter UK Limited

    United Kingdom

    Bollfilter UK is a team of highly motivated, positive and professional people with extensive knowledge and experience of the filtration industry. Here are some recent testimonials. As the dedicated technical sales arm of Boll & Kirch – Europe’s leading manufacturer of automatic water filters – Bollfilter UK provides complete filtration solutions and expertise through the supply of quality equipment, servicing, spares and support. Boll automatic filters are widely used by the UK water treatment industry thanks to their reliability, performance and durability. Featuring unique backflushing technology, they are provide low maintenance filter protection for tertiary waste water systems and primary potable water treatment plant and are ideal for unmanned sites. For potable water applications, Boll automatic filters can protect water treatment plant, such as membrane, UV disinfection, DAF recycling and ion exchange systems with a typical filtration level of 10-500 microns. For waste water treatment, Boll automatic filters can screen final effluent down to 50 microns for intermediate wash water equipment, such as screens, belt thickeners, filter presses and centrifuges. They can also protect NSAF and sand filters and be used with disc filters to prevent spray nozzles from blocking. For final effluent washwater booster pump protection, where overall pressure in the system is low but high pressure washwater is available, a Boll automatic filter fitted to the washwater feed will remove particulates to ensure efficient performance of pumps and keep downstream nozzles free from blocking. Where automatic filtration is not required, i.e. on cleaner systems or for very coarse filtration, Boll & Kirch also offer a range of simplex and duplex manual strainers. Bollfilter UK is dedicated to meeting and exceeding customer’s expectations from the first point of contact to the selection and supply of equipment, commissioning, after-sales support, spare parts advice recommendation and timely supply, on-site service/maintenance and training, and work for continual improvement through training and development. See some of our Case Studies: Automatic river water filtration for protection of the turbine cooling system National Oceanography Centre, Southampton Offshore wind parks: Filtration for Cooling of the Converter Platform BorWin Beta Chalton WRC Tertiary Treatment Plant for Ammonia & Solids Reduction HVAC: Art Gallery Liquid to Air Cooling & Heating System Roetgen Germany Potable Water Membrane Protection Pressured Far Baulker Potable Water Nitrate Reduction Plant (Ion Exchange) Keldgate Potable Water Membrane Protection Pressured Banwell Potable Water Membrane Protection Submerged Grimsbury Potable Water Nitrate Reduction Plant (Ion Exchange) Lound Potable Water DAF Saturator Protection Vines Cross Final Effluent Wash water Filtration Pump Protection Beckton Final Effluent Wash water Filtration Pump Protection Cranleigh Effluent Nitrifying Submerged Aerated Filter Protection Marchwood Power Station Cooling Water Salzbach-Salzberg Power Station Cooling Water Glendoe Power Station Cooling Water Reuter-Berlin Protection of Water Cooling System

    Treatment Process Technologies
    DAWSON-WAM Ltd logo

    DAWSON-WAM Ltd

    United Kingdom

    DAWSON-WAM are multi award winning, specialist civil engineering and piling contractors with operations throughout the UK and Ireland. The company undertakes both small and large-scale civil engineering and piling projects for residential, commercial and public authorities. The company was founded in 1971 and has grown to an organisation with an annual turnover in the region of £50M. Through DAWSON-WAM’s collaborative, problem solving approach we are able to offer a complete design and build service providing innovative, cost effective solutions to many of today’s construction related challenges. DAWSON-WAM also maintains an extensive, modern and highly capable plant fleet, complimented with regular annual investment. Please head over to our website to browse some of our previous works, and find out more about what we can do for you! Civils enquiries: est@dawsonwam.co.uk Piling enquiries: piling@dawsonwam.co.uk

    River & Coastal Flood Protection
    Concrete Works
    Galliford Try logo

    Galliford Try

    United Kingdom

    Galliford Try is a leading UK construction business employing over 4,000 people across the country. We are a people-orientated, progressive business, driven by our values to deliver lasting change for our stakeholders and the communities we work in. We are passionate about our role in providing vital buildings and infrastructure across the country, committed to the idea that what we do makes a real difference to people’s lives. Our purpose, vision and values shape our culture, proactively guiding our day-to-day activities and keeping us focused on what’s important to us. We take our role in society seriously, working to improve the UK’s built environment and delivering lasting change for the communities we work in. Our purpose is to improve people’s lives through building the facilities and infrastructure that communities need, providing opportunities for our people to learn, grow and progress, working with our supply chain to promote the very best working practice and caring for the environment in which we work. We do this by holding true to our values, delivering excellence for our clients and the community, being passionate about our role in providing vital services, putting integrity at the heart of our business by doing the right thing, and collaborating with our clients, supply chain and stakeholders to deliver lasting change and long-term value. Galliford Try is unrivalled in the water sector, with 95% of our work delivered through long-term collaborative arrangements. As our clients look to invest in an ageing asset base, we are well positioned to serve their needs across capital delivery and maintenance, and asset optimisation. Coupled with our approach to digitalisation, carbon reduction and innovation, our adoption of off-site build Design for Manufacture and Assembly is increasingly supporting our clients to achieve their objectives of net zero carbon, lower cost and shorter programme duration. We work on both frameworks and standalone projects, collaborating with our partners to ensure we offer a multi-disciplined approach that can deal with the significant challenges and complexity of outcome-based solutions in the sector. At Galliford Try, we’re proud to support the water sector with sustainable, innovative solutions that create lasting value for communities and the environment. #WaterSector #GallifordTry #Sustainability #Collaboration

    Networks - Water Supply
    Contractors

    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.