Turning wastewater into a simply sustainable resource.
Terragron designs, upgrades and runs Sewage Treatment Plants across Bangalore & Karnataka fixing odour, colour and compliance issues through biological process tuning, not expensive rebuilds.
Veterans in wastewater solutions, building simply sustainable systems
Terragron's practice was built the hard way on the operational floor of treatment plants, hands-on across every trade in the plant room, long before stepping into design leadership. Led by Founder & Director John Lazarus Armstrong, the team carries design, erection and commissioning under one roof, a single-point accountability model that closes the gaps left by vendors who split these functions across separate teams.
Our process portfolio spans Activated Sludge Process with Biological Nutrient Removal, Membrane Bioreactors, Sequential Batch Reactors, Ultrafiltration, Reverse Osmosis and advanced tertiary filtration engineered compact enough for basement and stilt-level installation, from 40 KLD boutique apartment plants to 2 MLD Highly richest residential. The premise stays the same at every scale: most STP problems are process problems, not equipment problems.
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"Every project we take on is a chance to prove that sustainability and cost-efficiency aren't a trade-off they're the same decision, made well."
Bengaluru's share of a nationwide sewage gap
India treats only a fraction of the sewage it generates. Here's where Karnataka and Bengaluru specifically sit inside that national picture.
Sources: CPCB National Inventory of STPs (2020–21) Economic Survey of Karnataka 2025–26 (BWSSB data) India Water Portal. Figures shown for context not project-specific.
Recent KSPCB / NGT / CPCB developments affecting STP owners
OCEMS mandated for STP outlets
KSPCB board resolution requires Online Continuous Effluent Monitoring at STP outlets across private apartments & commercial buildings in the Bangalore Metropolitan Region.
Tighter discharge norms notified
Circular sets BOD ≤10 mg/L, COD ≤50 mg/L, TSS ≤10 mg/L for surface water discharge stricter than national CPCB averages.
Flat penalties for non-compliance
Faulty STPs face flat fines; properties without any STP risk penalties running into crores, plus closure notices.
20 of 34 city STPs being upgraded
BWSSB is upgrading rehabilitated STPs across East & West zones to meet NGT norms, targeted for completion by year-end.
Nitrogen removal compliance windows
Legacy STPs are expected to retrofit for nitrogen removal within defined compliance timelines, even under space constraints.
OCEMS mandated for STP outlets
KSPCB board resolution requires Online Continuous Effluent Monitoring at STP outlets across private apartments & commercial buildings in the Bangalore Metropolitan Region.
Tighter discharge norms notified
Circular sets BOD ≤10 mg/L, COD ≤50 mg/L, TSS ≤10 mg/L for surface water discharge stricter than national CPCB averages.
Flat penalties for non-compliance
Faulty STPs face flat fines; properties without any STP risk penalties running into crores, plus closure notices.
20 of 34 city STPs being upgraded
BWSSB is upgrading rehabilitated STPs across East & West zones to meet NGT norms, targeted for completion by year-end.
Nitrogen removal compliance windows
Legacy STPs are expected to retrofit for nitrogen removal within defined compliance timelines, even under space constraints.
Every STP problem, solved through one process-first methodology
Whatever the symptom odour, colour, a fine, sludge, energy bills or a plant nobody trusts anymore Terragron runs it through the same diagnosis first: is this a biology problem or a hardware problem? Most turn out to be the former, which is why our answer is rarely "buy more equipment."
Odour control
Minor biological fine-tuning reduces or eliminates odour without buying additional equipment.
Colourless treated water
We target colour causing compounds at the biological stage so treated water meets discharge standards, consistently.
Government fines & compliance
Detailed design calculations and process adjustments that map directly to KSPCB / NGT requirements.
Space-constrained upgrades
Nitrogen removal ready upgrades that fit inside your existing footprint no major civil works needed.
Cost-efficient AMC/O&M
Experienced operators and structured maintenance that cut cost overruns beyond your annual contract.
Modernizing older STPs
Retrofits for legacy plants, balanced against space and budget meeting today's standards without a rebuild.
Sludge handling & disposal
Right-sized dewatering and disposal planning so sludge stops being an unbudgeted monthly headache.
High energy consumption
Blower and aeration tuning that cuts power draw without compromising treatment quality.
Unreliable operators
Trained, accountable operating staff so plant performance doesn't depend on who's on shift.
One technology rarely fits every site so we don't force it
Terragron's team has commissioned and modernised plants from 40 KLD to 2 MLD across every major biological treatment process. We pick and blend the technology that suits your land, budget and load.
ASP (with BNR)
Activated Sludge Process with Biological Nutrient Removal proven, robust and well suited to large, continuous-flow municipal and township loads.
SBR
Sequential Batch Reactor treats sewage in timed batches within a single tank, giving strong control over quality in a compact space.
EAAS
Extended Aeration Activated Sludge (EAAS) Terragron supplies, operates and maintains the treatment equipment under a single service fee, keeping upfront capex off your books.
Hybrid Systems
Combining ASP, SBR and membrane-based principles to match your exact site conditions rather than forcing one technology to fit every plot.
MBR
Membrane Bioreactor biological treatment and membrane filtration in one compact step, producing consistent reuse-grade treated water.
ASP (with BNR)
Activated Sludge Process with Biological Nutrient Removal proven, robust and well suited to large, continuous-flow municipal and township loads.
SBR
Sequential Batch Reactor treats sewage in timed batches within a single tank, giving strong control over quality in a compact space.
EAAS
Extended Aeration Activated Sludge (EAAS) Terragron supplies, operates and maintains the treatment equipment under a single service fee, keeping upfront capex off your books.
Hybrid Systems
Combining ASP, SBR and membrane-based principles to match your exact site conditions rather than forcing one technology to fit every plot.
MBR
Membrane Bioreactor biological treatment and membrane filtration in one compact step, producing consistent reuse-grade treated water.
Everything under Water. Everything under Power.
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Strategic design & engineering, integrated project execution, functionality & service, enhancement & overhaul, and sustained AMC/service contracts the full lifecycle of an STP.
Ultrafiltration, Reverse Osmosis and Water Softeners for buildings that want treated water to actually go back into use, not just leave compliant.
Polishing filtration (PSF/ACF) and disinfection systems sized to make treated water safe for flushing, irrigation and washdown.
Safety inspections, environmental impact assessment, sustainability audits, and supply of parts, consumables & chemicals.
Terragron vs a conventional STP vendor
Most vendors can build a tank. Fewer can run it intelligently for the next ten years. Here's the practical difference.
Terragron
Conventional Vendor
Our reports and records will speak for themselves when it comes to our experience and the calibre of our work.
Plants we've designed, commissioned or turned around
STP Cluster, Bangalore
Design, commissioning & optimisation of three major STPs Karnataka's first project generating power from biogas.
Lake Rejuvenation STP
Integrated advanced biological & chemical treatment for improved efficiency and significant cost savings.
High-Rise Residential Complex
Energy-efficient design reducing power consumption while holding treatment standards.
Premium Residential Enclave
Diagnosed as a pure operations issue, not a design fault resolved without any tank or structural change.
Residential Tower Turnaround
Took over a plant with recurring quality issues; now runs at consistent output with zero upgrades.
Zero-Odour High-Rise Retrofit
Eliminated persistent odour complaints in a 40-storey residential tower through biological tuning alone no new equipment.
Multi-Tower Township AMC
Consolidated 24×7 remote-monitored O&M across a multi-tower gated township, cutting response times to plant alerts.
High-Rise Water Reuse Programme
Treated water fully redirected to flushing & landscaping in a high-rise community, cutting fresh-water dependence.
Integrated WTP + STP Complex
Combined potable water treatment and sewage treatment designed and commissioned for one residential campus.
Built for the way Bangalore actually builds
Our sustainable horizons the ambitions ahead
Sustainability isn't a slogan bolted onto our brochures. It's the filter every design decision passes through, from the pipe diameter up.
At Terragron, sustainability spans both sides of the water-energy nexus: eco-friendly wastewater technologies that conserve water, and clean-energy integration including biogas-to-power that reduces the carbon footprint of the plants we run.
Terragron has worked on sites for
From RWAs and apartment associations in Whitefield, Sarjapur Road, Electronic City, HSR Layout, Marathahalli and Yelahanka to industrial clients in Peenya and Hoskote, Terragron delivers KSPCB & CPCB compliant Sewage Treatment Plant (STP), Effluent Treatment Plant (ETP) and Water Treatment Plant (WTP) solutions across Bangalore and Karnataka spanning ASP, SBR, MBBR, MBR and Hybrid technologies, STP AMC & O&M contracts, and wastewater recycling for apartments, commercial buildings, hospitals, hotels and industries.
ITC Limited
Britannia
JLL
ABB
BESCOM
Flipkart
Brigade Group
Volvo
Century Real Estate
IIT Dharwad
Vencobb
SDM Institutions
BWSSB
Prestige
DivyaSree
Elita
Rohan 
Larsen & Toubro
Inorbit
PuvaITC LimitedBritanniaJLLABBBESCOMFlipkartBrigade GroupVolvoCentury Real EstateIIT DharwadVencobbSDM InstitutionsBWSSBPrestigeDivyaSreeElitaRohan Larsen & ToubroInorbitPuvaOur odour complaints disappeared within weeks with zero new equipment. That alone justified the AMC switch.
Terragron walked us through the exact KSPCB design calculations. It's the first time an STP vendor made compliance feel manageable.
Our AMC costs stopped climbing every renewal. Same plant, same tanks just run properly.
Our STP cleared its KSPCB inspection on the very first visit after the retrofit. That had never happened before.
They treated our residents like clients, not just another maintenance ticket. Communication alone was worth switching for.
Zero unplanned downtime on our STP since we moved to Terragron's AMC and our facility team finally trusts the readings.
Transparent costing, no surprise line items at renewal. Exactly what an RWA committee needs to explain to residents.
Our treated-water reuse program finally works the way it was designed to flushing and landscaping, not just discharge.
They found the real issue in a single site visit. Our previous vendor had us guessing for months.
The compliance documentation alone saved us from a KSPCB show-cause notice during an audit.
Effluent quality has been consistent since the retrofit no more end-of-month scramble before inspections.
Illustrative client feedback, shared with permission and anonymised on request.
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"Engineering tomorrow's water solutions is not about bigger tanks it's about smarter processes. That's what simply sustainable means to us."— John Lazarus Armstrong, Founder & Director, Terragron
Have an STP that's giving you grief?
Tell us what's going wrong odour, colour, a fine, or just rising AMC costs. We'll tell you honestly if it's a process fix or a redesign.