Sewage Treatment Plant Manufacturer in India

Every day, India generates over 72,000 million litres of sewage.  Most of it goes untreated. The National Green Tribunal (NGT) has issued closure notices to housing societies without functional STPs. State Pollution Control Boards are tightening Consent to Operate conditions. Builders and RWAs are facing fines, occupancy certificate delays, and reputational damage - all because their STP was never properly designed or stopped performing within months of commissioning.

For residential societies, hotels, hospitals, and industrial facilities, the consequences of an inadequate sewage treatment system are no longer just environmental - they are legal, financial, and operational. Non-compliance with CPCB and State Pollution Control Board norms today means show-cause notices, consent cancellations, and in serious cases, building sealing orders. The margin for error is zero.

This is the problem Netsol Water was built to solve.

Netsol Water is a leading Sewage Treatment Plant Manufacturer in India with over 15 years of hands-on experience designing, manufacturing, and commissioning STP systems that deliver reliable, long-term performance - not just on the day of commissioning, but for years afterwards. We have installed 1000+ sewage treatment plant across 20+ Indian states, serving everything from 50-unit residential societies to large industrial townships requiring multi-MLD treatment capacity.

We don't supply equipment and disappear. We take complete, end-to-end responsibility - from sewage characterization and process design to civil coordination, commissioning, operator training, and long-term Annual Maintenance Contracts. Because the real measure of an STP manufacturer isn't the delivery date. It's whether the plant is still performing five years later.

15+ Years in STP Manufacturing

1000+ STP Plants Commissioned

20+ Indian States Served

1 KLD+ to Multi-MLD Capacity

Facing STP compliance issues? Planning a new plant? Talk to our engineers - Free Consultation: +91-9650608473

What Is a Sewage Treatment Plant?

A Sewage Treatment Plant (STP) is a facility that processes domestic or municipal wastewater - including toilet discharge, bathroom wastewater, kitchen effluent, and grey water - through a series of physical, biological, and chemical treatment stages to remove contaminants, so that the treated water can be safely discharged or reused.

In India, STPs are legally mandatory for:

. Residential societies with 50 or more units or generating more than 10 KLD of sewage

. Hotels, hospitals, and commercial buildings above prescribed floor area thresholds set by local authorities

. Industrial premises discharging domestic sewage within their campuses

. IT parks, educational institutions, and township developments above notified thresholds

The treated water from a properly designed STP can be reused for toilet flushing, landscape irrigation, cooling towers, and construction - reducing a project's freshwater dependency by 40–60% and delivering significant long-term operational cost savings.

About Netsol Water - STP Manufacturer

Netsol Water is a water and wastewater treatment company headquartered in Greater Noida, Delhi NCR. We specialize in the design, engineering, manufacturing, and execution of Sewage Treatment Plants (STPs), Effluent Treatment Plants (ETPs), and Water Treatment Plants (WTPs) across residential, commercial, hospitality, healthcare, industrial, and municipal sectors.

What distinguishes Netsol Water from the majority of STP suppliers in India is our process-first approach. Every project begins with a detailed analysis of sewage characteristics - BOD, COD, TSS, flow rates, inlet variation, and reuse requirements. Only after this analysis is complete do we recommend a technology. This step, which most suppliers skip entirely, is what determines whether an STP performs reliably for 15 years or starts failing at 18 months.

Company Parameter	Details
Headquarters	Greater Noida, Uttar Pradesh, India
Experience	15+ years in STP design and manufacturing
Plants Commissioned	1000+ STPs across pan-India projects
States Served	20+ states – North, South, East, West, Central India
Capacity Range	10 KLD to multi-MLD (large municipal/industrial)
Core Technologies	MBBR, SBR, ASP + Tertiary Treatment systems
Project Scope	Design → Manufacture → Install → Commission → O&M
Compliance	CPCB & State Pollution Control Board norms
Industries	Residential, Hotels, Hospitals, IT Parks, Industrial, Municipal
Contact	+91-9650608473 | enquiry@netsolwater.com

STP Technologies We Design & Manufacture

India's sewage treatment requirements are not uniform. A 200-unit housing society in Noida, a 300-room hotel in Goa, and a 500-bed hospital in Pune all have fundamentally different sewage characteristics, space constraints, operational capabilities, and treated water reuse goals. Recommending the same technology for all three is a mistake. Netsol Water's engineering team evaluates every parameter before selecting a technology - and we manufacture all three major STP process types in-house.             

1. MBBR - Moving Bed Biofilm Reactor

MBBR is currently India's most widely adopted STP technology for residential and commercial projects. Biological treatment takes place on specially engineered plastic media (biofilm carriers) that move freely within the aeration reactor, allowing a far higher concentration of active biomass per unit volume compared to conventional systems. The result: a more compact plant with more stable, consistent performance.

Why MBBR is preferred for urban Indian projects:

. Compact footprint - treats the same volume in significantly less space than ASP

. Performance stability - handles fluctuating sewage loads without process upsets

. Low sludge generation - reduces sludge disposal costs and effort

. Easy scalability - additional media can be added as occupancy or load increases

. Reuse-ready output - treated water quality suitable for tertiary polishing and reuse

Best suited for: Residential societies, apartment complexes, hotels, hospitals, and IT parks where space is at a premium and treated water reuse (flushing/irrigation) is planned.

2. SBR - Sequencing Batch Reactor

SBR technology operates in timed, sequential treatment cycles - fill, aerate, settle, decant, idle - all within a single reactor tank. The fully automated cycle management makes it exceptionally well-suited for facilities with significant variation in daily sewage inflow, where the reactor can be programmed to extend or compress cycles based on actual loading.

Advantages of SBR for variable-load projects:

• Excellent effluent quality - consistent BOD, COD, TSS removal across varying load conditions

• Nutrient removal capability - effective nitrogen and phosphorus removal when required

• Compact single-tank design - reaction and clarification occur in the same vessel

•  Automation-driven operation - reduces dependence on operator judgement for routine cycle management

Best suited for: Hotels, educational institutions, commercial complexes, and facilities with peak-hour loading patterns. Requires reliable automation and trained operational staff.

3. ASP - Activated Sludge Process

ASP is a proven, conventional biological treatment technology used widely in large-scale municipal and industrial sewage treatment. Mixed liquor is continuously aerated in open tanks with activated sludge recirculation, delivering effective treatment for high-volume, consistent-flow sewage applications where adequate land and trained operational staff are available.

Where ASP delivers best value:

• Large-capacity municipal and industrial plants - cost-effective at MLD-scale volumes

• Sites with abundant land - larger footprint is not a constraint

• Stable, high-volume inflows - performs reliably when loading variation is low

• Projects with trained O&M staff - long-term biological management is feasible

Best suited for: Large industrial townships, municipal sewage treatment schemes, and campuses with adequate land area and experienced operational teams.

4. Tertiary & Advanced Treatment for Water Reuse

For projects where treated water reuse is a primary objective - as required under IGBC/LEED green building certifications, or simply to reduce freshwater costs - Netsol Water integrates tertiary treatment systems downstream of the biological stage. These systems upgrade treated STP water to a quality safe for non-potable reuse applications.

Tertiary treatment systems we integrate:

• Pressure Sand Filter (PSF) - removes residual turbidity and suspended solids

• Activated Carbon Filter (ACF) - removes colour, odour, and residual organic compounds

• Ultrafiltration (UF) - removes microbial load and fine particulates before reuse

• UV + Chlorination - pathogen disinfection to safe non-potable reuse standards

• RO Polishing - for high-purity applications such as cooling tower make-up water

With a complete tertiary system, treated STP water can be reused for toilet flushing, landscape irrigation, vehicle washing, fire hydrant testing, and cooling tower make-up water - typically reducing a building's freshwater consumption by 40–60%.

STP Capacity Range & Application Segments

Netsol Water designs, manufactures, and executes sewage treatment plants from 10 KLD to multi-MLD - covering every segment of India's built environment:

Application Segment	Recommended Technology	Typical Capacity Range
Residential Societies	MBBR / SBR	10 KLD – 2 MLD
Township Developments	MBBR / ASP	100 KLD – 5 MLD+
Hotels & Resorts	MBBR / SBR	20 KLD – 500 KLD
Hospitals & Healthcare	MBBR	10 KLD – 500 KLD
IT Parks & Offices	MBBR / SBR	50 KLD – 1 MLD
Educational Institutions	SBR / ASP	10 KLD – 500 KLD
Industrial Facilities	ASP / MBBR	100 KLD – Multi-MLD
Municipal Projects	ASP / SBR	1 MLD – 50 MLD+

One of the most common questions we receive is: "What is the cost of a sewage treatment plant in India?"The answer depends on several project-specific variables. Unlike packaged consumer products, every STP is engineered for its specific site - making a single price figure both misleading and potentially dangerous for project budgeting.

The key cost-determining factors for any STP project in India:

• Treatment capacity (KLD/MLD): Larger systems cost more in absolute terms but less per KLD due to economies of scale

• Technology selected: MBBR and SBR have higher upfront equipment costs than ASP but significantly lower operating costs over the plant's lifetime

• Treated water quality target: Basic discharge-grade treatment versus reuse-grade tertiary treatment represent substantially different cost profiles

• Inlet sewage strength: High-strength or heavily loaded sewage requires larger reactors and more treatment stages

• Civil construction scope: Equipment-only supply versus full EPC (Equipment, Procurement, and Construction) contracts are priced very differently

• Material of construction: MS painted, SS 304, SS 316, or FRP - each with different cost and lifespan implications for Indian site conditions

• Site location: Remote sites, hilly terrain, or restricted access points increase logistics and installation costs

STP Capacity Range	Indicative Equipment Cost (INR)
10 KLD – 25 KLD	INR8 Lakhs – INR18 Lakhs (equipment only)
25 KLD – 50 KLD	INR18 Lakhs –INR28 Lakhs (equipment only)
50 KLD – 100 KLD	INR28 Lakhs –INR55 Lakhs (equipment only)
100 KLD – 250 KLD	INR55 Lakhs –INR90 Lakhs (equipment only)
250 KLD – 500 KLD	INR1 Crore –INR1.5 Crore
500 KLD – 1 MLD	INR1.5 Crore –INR3.5 Crore
1 MLD and above	Project-specific – contact for detailed estimate

Note: These are indicative ranges for equipment supply only. Civil construction, tertiary treatment, O&M, and site-specific requirements are additional. Contact Netsol Water for a project-specific technical and commercial proposal with accurate costing.

Why Choose Netsol Water as Your STP Manufacturer?

India has hundreds of companies that call themselves STP manufacturers or suppliers. The difference between a plant that performs reliably for 15 years and one that fails within 18 months almost always comes down to the quality of engineering, the honesty of the commissioning process, and the availability of support after handover. Here is what makes Netsol Water's approach different:

1. End-to-End Project Responsibility - One Company, Full Accountability

Netsol Water does not operate as an equipment supplier who hands over to a separate installation contractor, who hands over to a separate O&M company. We take single-point responsibility for the entire project - from the initial site assessment and process design to civil coordination, manufacturing, installation, commissioning, operator training, and long-term AMC. This eliminates the accountability gaps where most STP failures originate.

2. Process Engineering Before Equipment Selection

Every project begins with a detailed analysis of actual sewage characteristics - not assumed values. We measure BOD, COD, TSS, pH, flow rates, and peak variation before selecting any technology or sizing any equipment. This approach takes more time upfront. It also means the plant is designed for what your sewage actually is, not what a textbook assumes it should be.

3. 500+ Commissioned Plants. Real Indian Site Experience.

Our engineers have not just designed STPs - they have commissioned and troubleshot them in high-rise towers in Delhi NCR, industrial campuses in Gujarat, hill station resorts in Himachal Pradesh, coastal hotels in Goa, and flood-prone sites in Assam. This depth of real-world experience is embedded in every design decision we make for your project.

4. CPCB & State PCB Compliance Built Into the Design

Every sewage treatment plant we design targets the output parameters specified by CPCB and the relevant State Pollution Control Board from the first day of engineering - not retrofitted at the end to pass a test. We also support clients through STP approval processes, consent applications, and compliance documentation, reducing the regulatory burden on your team.

5. Energy-Efficient Systems That Reduce Operating Costs

Blowers, pumps, and diffusers in our systems are sized based on actual oxygen demand calculations - not over-specified to create an impressive-looking spec sheet. Right-sized equipment consumes significantly less power. Over a 15-year plant life, the difference in energy costs between an optimally designed STP and an over-specified one can amount to tens of lakhs of rupees.

6. Post-Commissioning Support You Can Actually Rely On

More than 80% of Netsol Water's new projects come from referrals and repeat clients. That number reflects one thing: we are reachable and responsive after commissioning. Our technical team answers calls. Our AMC teams show up on schedule. Our engineers come back when something doesn't go as planned - not because of contract obligations, but because a non-performing STP reflects on our engineering.

What We Do Differently	How Netsol Water Delivers It
Process Design	Site-specific sewage characterization before any design
Technology Selection	Based on data – BOD, COD, TSS, flow, reuse goals
Civil Coordination	Included in our project scope and responsibility
Compliance Support	CPCB/PCB documentation, approval assistance included
Commissioning	Full biological start-up, seeding, stabilization support
Operator Training	Formal training program – SOPs, safety, monitoring
Post-Commissioning	Structured AMC, performance audits, emergency support
Accountability	Single-point EPC responsibility – one company throughout

CPCB Compliance & STP Output Standards

All sewage treatment plants in India must meet the discharge standards specified by the Central Pollution Control Board (CPCB) under the Environment Protection Act and Water (Prevention and Control of Pollution) Act. For projects targeting treated water reuse, stricter standards apply. Netsol Water designs every STP to meet or exceed these parameters:

Water Quality Parameter	CPCB Standard / Guideline Value
BOD (Biochemical Oxygen Demand)	≤ 10 mg/L (reuse) / ≤ 30 mg/L (surface water discharge)
COD (Chemical Oxygen Demand)	≤ 50 mg/L
TSS (Total Suspended Solids)	≤ 10 mg/L (reuse) / ≤ 100 mg/L (discharge)
Faecal Coliform	< 100 MPN/100 mL (for reuse applications)
pH	6.5 – 9.0
Ammoniacal Nitrogen (as N)	≤ 50 mg/L
Oil & Grease	≤ 10 mg/L

For projects under IGBC or LEED green building certification, or state-level green building codes, treated water reuse requirements may be more stringent. Our tertiary treatment systems are designed to meet these higher-grade standards where required.

How We Execute Every STP Project - Our 8-Stage Process

01	Sewage Characterization & Site Assessment We begin with a detailed analysis of inlet sewage: BOD, COD, TSS, pH, flow rate, peak-to-average ratio, and site constraints.
02	Technology Selection Based on the site assessment data, we recommend MBBR, SBR, or ASP with detailed justification.
03	Process Design & Engineering Complete hydraulic design, equipment sizing calculations, P&ID diagrams, civil GA drawings, and electrical diagrams.
04	In-House Manufacturing Equipment fabricated at our manufacturing facility with full QA checks before dispatch.
05	Site Installation & Civil Coordination Our installation team manages structural, mechanical, and electrical integration at site.
06	Biological Start-Up & Commissioning Seeding with activated sludge, acclimatization, gradual load increase, and stabilization.
07	Operator Training & Handover Formal training covering monitoring procedures, maintenance tasks, safety practices, and record-keeping.
08	Post-Commissioning O&M Support AMC plans, performance audits, spare parts supply, and emergency technical support.

Operation & Maintenance Support

The most common reason an STP fails to perform is not poor equipment - it is poor operation. A sewage treatment plant is a living biological system. The microbial communities responsible for treatment are sensitive to sudden changes in load, temperature, toxic shock, and oxygen supply. Without consistent, knowledgeable day-to-day management, even a well-engineered system will underperform.

Netsol Water's O&M support program includes:

• Operator Training Programs - standard operating procedures, daily monitoring routines, safety protocols, emergency shutdown procedures

• Preventive Maintenance Schedules - blower servicing, pump inspection, diffuser fouling checks, media health audits, sludge disposal management

• Annual Maintenance Contracts (AMC) - structured periodic visit plans and on-call emergency response services

• Quarterly Performance Audits - independent treated water quality testing, process performance assessment, recommendations report

• Remote Monitoring Support - SCADA-linked performance dashboards for projects with automation systems

• Spare Parts Supply - genuine OEM-equivalent components with documented traceability and lead-time guarantees

For large residential societies, commercial campuses, and hospitality projects, we also offer full third-party O&M contracts where Netsol Water's trained technicians take over daily STP operations - removing the burden entirely from your in-house team.

Frequently Asked Questions

Q1.  What is the cost of a sewage treatment plant in India?

The cost of an STP in India depends on treatment capacity, technology, site conditions, and project scope. As indicative ranges: a 50 KLD MBBR STP costs approximately INR20–25 Lakhs for equipment supply; a 100 KLD plant ranges from INR40–55 Lakhs; a 500 KLD system may cost INR1 Crore to INR1.5 Crore. Civil construction, tertiary treatment, and O&M are priced separately. Contact Netsol Water for an accurate project-specific estimate based on your actual requirements.

Q2.  Which STP technology is best for residential societies in India?

MBBR (Moving Bed Biofilm Reactor) is the most widely recommended STP technology for residential societies in India. It offers a compact footprint suitable for urban plots, stable performance under fluctuating loads, low sludge generation, and produces treated water suitable for reuse after tertiary polishing - making it ideal for gated communities and apartment complexes where flushing reuse is planned.

Q3.  Is an STP mandatory for housing societies in India?

Yes. As per CPCB regulations and state-level notifications from most State Pollution Control Boards, residential societies generating more than 10 KLD of sewage - roughly 50 or more dwelling units depending on per capita water supply norms - are required to install and operate a functional STP. The NGT has reinforced this requirement through multiple orders and has imposed penalties on non-compliant societies.

Q4.  How long does it take to install and commission an STP?

A complete MBBR or SBR STP project - from order placement to full biological stabilization - typically takes 3 to 5 months, depending on site readiness and civil completion status. Equipment manufacturing and delivery: 4–8 weeks. Site installation: 2–4 weeks. Biological start-up and stabilization (seeding and acclimatization): 4–6 weeks. Shortcutting the biological start-up phase - as many contractors do - is the single most common cause of poor initial STP performance.

Q5.  What is the power consumption of a sewage treatment plant?

Power consumption depends on technology, capacity, and design quality. A well-designed MBBR STP consumes approximately 0.3–0.6 kWh per KLD of sewage treated. For a 100 KLD plant, this translates to 30–60 kWh/day. Poor design - particularly over-sized blowers running continuously at full load - can double this figure. Netsol Water sizes all aeration equipment to actual oxygen demand calculations, consistently achieving lower operating power costs than industry averages.

Q6.  Can treated STP water be reused, and for what purposes?

Yes. With appropriate tertiary treatment - pressure sand filtration, activated carbon filtration, UF, and disinfection - treated STP water meets the standards required for toilet flushing, landscape irrigation, cooling tower make-up water, vehicle washing, and construction activity. Treated water reuse typically reduces a building's freshwater demand by 40–60%, delivering significant long-term cost savings and supporting green building certifications like IGBC and LEED.

Q7.  Who grants STP approval in India?

STP approvals - Consent to Establish (CTE) and Consent to Operate (CTO) - are issued by the relevant State Pollution Control Board (SPCB) or Pollution Control Committee (PCC) under the Water (Prevention and Control of Pollution) Act, 1974. Some municipal corporations and local development authorities have additional building plan approval requirements for STPs. Netsol Water assists clients with technical drawing preparation, consent application documentation, and follow-up correspondence with regulatory authorities.

Q8.  What is the difference between STP and ETP?

An STP (Sewage Treatment Plant) treats domestic wastewater generated by human activity - from toilets, bathrooms, and kitchens in residential, commercial, or institutional buildings. An ETP (Effluent Treatment Plant) treats industrial process wastewater, which may contain chemicals, heavy metals, high-temperature effluents, or sector-specific pollutants. ETPs require complex chemistry and specialized process design tailored to the specific industry's effluent characteristics. Netsol Water designs and manufactures both STPs and ETPs, and can advise on combined treatment where both domestic and industrial streams are present.

STP Projects Across India - Pan-India Execution Capability

Netsol Water has successfully designed and commissioned sewage treatment plants across all major Indian states and Union Territories, including Uttar Pradesh, Delhi NCR, Haryana, Rajasthan, Maharashtra, Gujarat, Karnataka, Tamil Nadu, Telangana, Andhra Pradesh, Kerala, West Bengal, Madhya Pradesh, Chhattisgarh, Bihar, Jharkhand, Odisha, Punjab, Himachal Pradesh, Uttarakhand, Jammu & Kashmir, Goa, Assam, and Meghalaya.

Our state-specific teams understand local State Pollution Control Board norms, regional sewage characteristics, climate-driven treatment variations, and local civil construction practices - enabling faster regulatory approvals, smoother site execution, and compliant long-term operations in every geography we serve.

• North India: UP, Delhi NCR, Haryana, Rajasthan, Punjab, Himachal Pradesh, Uttarakhand, J&K

• West India: Maharashtra, Gujarat, Goa, Madhya Pradesh, Chhattisgarh, Rajasthan

• South India: Karnataka, Tamil Nadu, Telangana, Andhra Pradesh, Kerala

• East India: West Bengal, Bihar, Jharkhand, Odisha, Assam, Meghalaya, NE States

Get a Free Technical Consultation

Whether you are in the early planning stage of a new development, dealing with a non-compliant existing STP, facing a Pollution Control Board notice, or simply looking to compare manufacturers before making a decision - Netsol Water's engineering team is available for a free, no-obligation technical consultation.

In a single consultation, our engineers will provide:

• Technology recommendation based on your site, sewage characteristics, and reuse goals

• Capacity sizing guidance and layout footprint estimation based on your available space

• Regulatory overview for STP approval requirements in your state

• Indicative cost estimate for equipment supply and project scope

• O&M model recommendation - in-house, AMC, or full third-party operations

Call Us: +91-9650608473, Email Us: enquiry@netsolwater.com