Water treatment equipment only performs to its design standard when it is properly maintained. Whether that means keeping Hydrotec-supplied equipment running at peak efficiency, or taking on full operational responsibility for a complex water and wastewater treatment site, Hydrotec provides maintenance and service contracts tailored to the needs of the facility and the level of support required.
We maintain water treatment systems across thousands of sites globally, working with facilities managers, building operators, hospitality groups, healthcare providers, and industrial clients. Our contracts range from scheduled planned preventive maintenance visits through to full Annual Maintenance Contracts and Operations & Maintenance agreements where we take day-to-day responsibility for an entire treatment system.
1,000+
Sites managed globally
Global Coverage
UK, Europe, Middle East and beyond
Any Scope
Equipment-only to permanently-staffed O&M

Poorly maintained water treatment systems fail - often at the worst possible time.
Neglected equipment produces water that is out of specification, damages downstream infrastructure, and creates compliance risk. Dosing pumps drift out of calibration. Membranes foul and fail. Chemical levels drop. The consequences range from equipment damage and system downtime through to regulatory enforcement, legal liability, and in the worst cases, serious risk to public health.
For operators of complex facilities - hotels, hospitals, industrial sites, developments with on-site STP or greywater systems - the burden of keeping water treatment plant within specification is significant. A properly structured maintenance contract transfers that burden to a specialist, with clearly defined scope, scheduled visits, and documented outcomes.
Planned Preventive Maintenance
Our PPM contracts provide scheduled, documented maintenance visits carried out by qualified engineers. Each visit is planned to the manufacturer's service schedule and covers inspection, calibration, chemical checks, component replacement where required, and a written service report. PPM contracts are available for the full range of Hydrotec-supplied equipment and for third-party systems where we have the relevant expertise.
- Scheduled visits at agreed frequencies - quarterly, six-monthly, or annual
- Full equipment inspection, calibration, and performance check
- Water sampling and parameter verification
- Documented service reports for compliance and audit purposes
- Reactive call-out support between scheduled visits
Annual Maintenance Contracts & O&M Agreements
For more complex facilities, or where an operator wants to transfer full responsibility for a water treatment system to a specialist, Hydrotec offers Annual Maintenance Contracts (AMCs) and Operations & Maintenance (O&M) agreements. These go significantly beyond standard PPM - we take ongoing responsibility for system performance, chemical supply, water quality monitoring, and day-to-day operational management of the plant.
We maintain a wide range of water and wastewater treatment systems - including plant originally installed by other suppliers. If a system is running and producing water, we can maintain it.
AMC / O&M Scopes Available
- Scheduled and reactive maintenance visits
- Chemical supply and dosing management
- Regular water quality sampling and laboratory analysis
- System parameter monitoring and adjustment
- Consumable and spare parts management
- Compliance documentation and reporting
- Leased equipment, water-quality-as-a-service
Systems We Maintain
- Chilled water and heating systems - dosing and water quality management
- Swimming pools and spa pools
- Sewage treatment and effluent treatment plants
- Greywater recycling systems
- Reverse osmosis and desalination plant
- Scale and bacterial control systems
- Filtration and water softening systems
Our Offering
Every contract is structured around the needs of the site. We work with clients to define the right scope, visit frequency, and level of ongoing involvement - from light-touch PPM through to full operational management. All contracts are backed by qualified engineers with direct manufacturer knowledge of the equipment they are servicing.
- Bespoke contract scope - from single equipment PPM to full site O&M
- Coverage of own-supply and third-party plant
- Chemical supply included where required
- Chemical supply included where required
- Full compliance documentation and reporting
- Reactive and emergency support