Sewage Treatment Plant and Water Treatment Plant Operation and Maintenance
Reliable plant operation, preventive maintenance, troubleshooting, rectification and performance improvement for commercial, industrial and institutional treatment plants.
- Preventive and breakdown maintenance for existing plants
- Rectification of underperforming Sewage and Water Treatment Plants
- Capacity, process and equipment upgradation
- Long-term technical manpower and plant-management support
Sewage Treatment Plants, Water Treatment Plants and Effluent Treatment Plants are live engineering systems. They combine mechanical, electrical, hydraulic, chemical and biological processes — and they need continuous technical supervision, preventive maintenance and process monitoring to operate reliably against their design intent.
Decon Infratech works as a long-term technical service partner for Sewage Treatment Plants, Water Treatment Plants and — where applicable — Effluent Treatment Plants. This includes running well-designed plants, taking over existing poorly performing plants, rehabilitating ageing installations and providing technical manpower and maintenance support to owners, developers, facility-management companies, main contractors and consultants.
For new plant design, supply, installation and commissioning, please see our Sewage Treatment Plant, Water Treatment Plant and Effluent Treatment Plant solutions page.
Operation and Maintenance Services
A structured Operation and Maintenance programme covers day-to-day plant operation, preventive maintenance, mechanical and electrical upkeep, dosing-system care and documented reporting.
Daily Operation
- Daily plant operation and process monitoring
- Logbook and operating-record maintenance
- Sludge-handling support
- Consumable planning and reordering
- Performance reporting
Preventive & Mechanical Maintenance
- Scheduled equipment inspection
- Pump maintenance
- Blower maintenance
- Valve and piping inspection
- Filter and media inspection
Electrical, Panel & Dosing
- Electrical maintenance
- Control-panel inspection
- Chemical-dosing-system maintenance
- Breakdown identification and troubleshooting
- Replacement recommendations
Manpower & Reporting
- Operator and technical manpower support (as per contract)
- Preventive-maintenance schedules
- Site checklists and handover documentation
- Periodic client review meetings
Common Sewage and Water Treatment Plant Problems We Address
Underperforming plants usually show a recognisable pattern of issues. Decon's engineers investigate root causes on site before recommending corrective work — quick fixes are rarely durable on treatment plants.
Definitive remedies are proposed only after a site assessment covering process, hydraulics, equipment condition and operating data.
Treatment Plant Rectification and Rehabilitation
Rectification restores a plant that has drifted from its design behaviour. Rehabilitation goes further — refurbishing tankage, replacing damaged equipment and restoring an ageing plant to a reliable operating condition.
Final recommendations depend on site inspection, operating data and actual plant condition. Decon does not commit to specific outcomes without an on-site technical review.
Sewage Treatment Plant and Water Treatment Plant Upgradation
Upgradation covers capacity enhancement, process modification, equipment replacement and improvements to filtration, disinfection, controls and energy efficiency — where technically feasible for the existing plant.
Upgradation scope and statutory compliance implications are assessed on a project basis. Decon does not guarantee statutory compliance without detailed assessment and approval.
Our Operation and Maintenance Process
A predictable, engineer-led process from first site visit to long-term plant management.
- 1
Initial Site Visit
Walk-through by a Decon engineer to understand the plant and current concerns.
- 2
Existing Plant Assessment
Review of process flow, tankage, hydraulics and installed equipment.
- 3
Capacity & Condition Review
Check plant capacity against actual load and current operating condition.
- 4
Equipment & Process Inspection
Inspection of pumps, blowers, panels, dosing units, media and instrumentation.
- 5
Problem Identification
Root-cause analysis of odour, quality, breakdown or performance issues.
- 6
Scope & Commercial Proposal
Documented scope of Operation and Maintenance, rectification or upgradation with commercials.
- 7
Mobilisation of Technical Team
Deployment of engineers, technicians and operators per agreed contract.
- 8
Preventive-Maintenance Schedule
Structured PPM plan for mechanical, electrical, dosing and instrumentation.
- 9
Rectification & Replacement Work
Execution of approved corrective work and component replacements.
- 10
Routine Monitoring & Reporting
Daily operation, logbooks and periodic performance reports to the client.
- 11
Performance Review
Structured review of plant behaviour, consumables and breakdown history.
- 12
Long-Term Improvement Recommendations
Advisory on further upgradation, efficiency and life-extension measures.
Verified Project Experience
One representative example of Decon's long-term treatment-plant service experience.
Siemens, Sector 142, Noida — Corporate Campus Treatment Plants
Decon Infratech designed, installed and commissioned an 80 KLD Sewage Treatment Plant and a 16.2 cubic metres per hour Water Treatment Plant for Siemens at their Sector 142, Noida corporate campus in 2018. The plants have been under continuous Operation and Maintenance support by Decon Infratech for approximately eight years as of 2026.
- 80 KLD Sewage Treatment Plant — designed, installed and commissioned in 2018
- 16.2 cubic metres per hour Water Treatment Plant — commissioned in 2018
- Continuous Operation and Maintenance support for approximately eight years as of 2026
~8 yrs
Continuous Operation and Maintenance Support
80 KLD
Sewage Treatment Plant
16.2 m³/hr
Water Treatment Plant
Reference shared factually. Siemens name and logo remain the property of their respective owners; no endorsement or partnership is implied.
Decon Infratech Project Execution
Water Treatment Plant Installation Services
Real project execution images showcasing Decon Infratech's water treatment plant installation work — filter vessels, pump rooms, manifolds and distribution piping delivered on live client sites.
Who We Work With
Operation and Maintenance services are structured for serious B2B clients running commercial, industrial and institutional treatment plants.
Annual Maintenance Contracts for Treatment Plants
Annual Maintenance Contracts (AMC) are structured to match the plant, the site team and the client's operating model. Common contract structures are listed below — the actual scope, manpower, consumables, replacements and testing responsibilities are always defined in the signed contract.
Preventive-Maintenance Contract
Scheduled inspection and preventive servicing of plant equipment.
Comprehensive Operation and Maintenance Contract
End-to-end operation, preventive maintenance and defined replacements.
Technical-Manpower Contract
Deployment of trained operators and technicians at your plant.
Breakdown-Support Contract
On-call attendance for breakdown, troubleshooting and rectification.
Equipment-Specific Maintenance
Maintenance of specific items — pumps, blowers, panels or dosing systems.
Rectification and Rehabilitation Contract
One-time or phased corrective work to restore plant performance.
Long-Term Plant-Management Contract
Multi-year technical partnership for continuous plant management.
Decon does not publish fixed package prices. Commercials are prepared per plant after a site assessment.
Why Decon Infratech
Multi-Disciplinary Engineering
In-house mechanical, electrical, piping and process coordination — a single team accountable for the plant.
Sewage, Water and Effluent Treatment Experience
Experience across Sewage Treatment Plants, Water Treatment Plants and Effluent Treatment Plants for commercial, industrial and institutional sites.
End-to-End Capability
Design, installation, commissioning and long-term maintenance capability — not just breakdown response.
Project-Based Technical Support
Structured mobilisation for main contractors, developers, PMCs and facility-management companies.
Real Project Case Studies
Published case studies including Okhla fire fighting and Varanasi Ropeway PHE works — evidence of delivery.
Engineering Legacy Since 1986
Continuous engineering practice since 1986 across fire, PHE and treatment-plant scopes.
Frequently Asked Questions
Related Services and Projects
Sewage Treatment Plant, Water Treatment Plant and Effluent Treatment Plant solutions
Design, supply, installation and commissioning of new treatment plants.
Plumbing & PHE Contractor
Internal and external plumbing, drainage and rainwater harvesting.
MEP Contractor
Integrated mechanical, electrical and plumbing contracting.
Projects Portfolio
Completed fire, PHE and MEP projects across India.
Varanasi Ropeway PHE Case Study
Public Health Engineering package for a live infrastructure project.
Project Enquiry
Speak to a Decon engineer about your treatment-plant requirement.
Discuss Your Treatment Plant Requirement
Share your plant details and current concerns. A Decon engineer will respond within one working day.