An office tenant should verify both the authority to operate the building's sewage treatment plant and evidence that the plant actually works. An occupancy certificate, a water bill and an annual maintenance contract answer different questions. None, by itself, proves that the correct entity holds the necessary pollution consent for the treatment and disposal arrangement serving the office.
The review should start before the lease is signed or occupancy increases. It should identify the whole building or approved project, the actual sewage load, the approved treatment system and the person legally responsible for it. A tenant's small floor area does not necessarily determine the position of the larger commercial complex.
The framework discussed here was reviewed on 18 October 2026. Karnataka's requirements include amendments distinguishing sewered from unsewered areas, as well as later building provisions. Older summaries using one universal area threshold can therefore mislead.
Identify the premises, plant and responsible entity
Ask the facility manager for a site plan marking the office tower, all other connected buildings, the STP, collection network, treated-water storage, reuse pipes and final disposal points. Record the plant's rated capacity in kilolitres per day, treatment technology, commissioning date and any subsequent addition or modification.
Then identify four roles: land or building owner, entity named in the pollution consent, facility manager and operating contractor. These may be different persons. Put their legal names, addresses and contact details beside the approval numbers. “Managed by the developer” is insufficient when the developer has handed over the property and no longer controls operations.
A common STP may serve several blocks or phases. Verify that the relevant approval and hydraulic design include the tenant's building and present load. A plant located next door is not necessarily an approved shared facility. Ask for the agreement, approved connection and capacity allocation rather than relying on proximity.
Separate three kinds of approval
| Record | Question it helps answer |
|---|---|
| Building sanction and occupancy permission | Is the building approved for its specified construction and use? |
| KSPCB establishment and operating consent records | What pollution-control system and discharge or reuse conditions apply to the project? |
| BWSSB or other competent water/sewer authority permissions | What water supply, sewer connection and discharge arrangement is authorised? |
Karnataka uses the expressions Consent for Establishment and Consent for Operation, often abbreviated CFE and CFO. An establishment consent concerns the approved proposal; the existence of that document should not be presented as proof of permission for completed operations. Review the operating document, amendments and any later directions.
Where environmental clearance applies to the development, its sewage and reuse conditions must also be read. It is a further layer, not a replacement for the other records. Likewise, water-board acceptance of a connection does not erase a stricter condition in the project's environmental approval.
A tenant does not necessarily need a separate STP consent merely because it occupies space in a properly approved common building. However, that conclusion requires a demonstrated connection to the authorised system. A restaurant, laboratory, healthcare unit or other activity introducing different wastewater may need additional analysis instead of being treated as ordinary office sewage.
Apply the correct threshold and the correct version of the rules
The March 2024 corrigendum to the Karnataka STP notification distinguishes areas where the local body's sewer line and STP exist from areas where they do not. For commercial construction projects, including offices and IT-related activities, its sewered-area table specifies total built-up area of 5,000 square metres and above or sewage generation of 35 KLD and above. The unsewered-area table specifies total built-up area of 2,000 square metres and above.
These are project-level screening conditions under that notification, not a conclusion that every office below one number is free of all wastewater obligations. Verify the area's actual qualifying sewer infrastructure, the project's classification, its permissions and later applicable requirements. A drain outside the gate is not proof of a lawful sewer connection and treatment destination.
The same corrigendum addresses existing installed STPs: their management must follow the prescribed parameters, with reuse/recycling or a permitted drainage arrangement, including prior BWSSB permission and written KSPCB intimation where that route applies. Falling below a revised installation threshold is not, by itself, authority to switch off an existing approved plant.
The February 2026 Municipal Corporations Model Building amendments add another important distinction. They address sewage management for relevant building projects above 5,000 square metres and preserve other approvals and more stringent provisions. They include dual plumbing and alternatives involving common off-site treatment or, in the smaller specified building category, separate black-water and grey-water arrangements subject to conditions. Larger specified categories have detailed treatment, adequacy-certification and metering requirements.
Do not simplify these provisions into either “every building must have its own identical STP” or “sewer connection exempts the building.” Establish the applicable local building instrument, project category, approval date and sanctioned arrangement, including the competent corporation within the current Greater Bengaluru structure. The correct question for a tenant in an existing STP building remains whether the authorised system and its conditions cover the present use.
Reconcile approved capacity with actual occupancy
Obtain the approved water balance and compare it with present occupation. Include all connected floors, shifts, common toilets, canteens, visitors and other contributors. A building's treatment requirement is not accurately measured by the tenant's payroll alone.
Distinguish rated capacity from actual throughput and treatment performance. A 100 KLD nameplate does not prove that a neglected or partially disabled plant can treat 100 KLD to the required quality. Conversely, very low loading can also cause operational difficulties in some treatment systems. A competent wastewater professional should assess hydraulic and organic loading, rather than simply dividing floor area by a generic internet factor.
For illustration, a tower's approval assumes one office shift and a modest canteen. New tenants introduce two shifts, a larger food service and a separate event floor. The facility manager should recalculate the combined wastewater and check whether the approved treatment, reuse and disposal arrangement remains adequate. The fact that no extra floor has been constructed does not answer that question.
Before expansion, identify whether an amended consent or other approval is required. Do not install extra tanks or connect another building first and treat paperwork as an afterthought. Retain the technical review and the authority's decision with the revised drawings.
Follow the treated water to its destination
Ask where treated water goes on a normal day and during low demand, rain, equipment breakdown and peak occupancy. Record quantities reused for flushing, landscaping or other approved purposes, quantities discharged through a permitted outlet and any lawful off-site movement.
Dual plumbing should keep potable and treated-water systems properly separated. Request commissioning, inspection and cross-connection checks appropriate to the system. A coloured pipe or a “recycled water” label is not proof that the network is safely configured and operated.
Avoid accepting “zero discharge” as a slogan. The water balance should explain how supply, sewage generation, treatment, reuse, storage and any permitted surplus are reconciled. Tanker invoices alone do not establish a lawful destination. Nor should treated water be sent into a stormwater drain because the sewer is unavailable.
Check the actual quality conditions applicable to the plant and discharge or reuse route. Do not select one BOD number from another project's consent and assume it is the complete standard. Parameters, sampling points and frequencies should come from the operative conditions, standards and directions applying to this installation.
Request operating and sampling evidence
The tenant's recommended evidence pack should include:
- Complete CFE/CFO and amendment records, not merely their first pages.
- Applicable water-board connection, discharge and reuse permissions.
- Approved and current process diagrams, capacity and water balance.
- The operator's contract, staffing arrangement, training and escalation contacts.
- Recent operating logs, electricity use, chemical records and equipment-service reports.
- Laboratory results linked to actual sampling dates and locations, with any required recognition or accreditation details.
- Corrective-action records for failed results, breakdowns, odour complaints and bypass incidents.
- Sludge-removal records identifying quantity, transporter, destination and the applicable lawful treatment or disposal route.
The exact statutory records depend on the approvals. The broader pack is a practical due-diligence recommendation, not a claim that every listed document is universally required in the same form.
Read trends rather than relying on one favourable sample. Check whether the report concerns the final outlet, whether samples were taken while the plant was operating normally and whether adverse results led to repairs and retesting. A laboratory result obtained before a recent occupancy increase may not describe present performance.
Sludge needs its own trail. Do not automatically classify every sewage sludge as hazardous waste, and do not assume every sludge can be spread on land. Its characteristics, contamination and applicable approvals determine the route. A contractor's promise to “clear the tank” is not evidence of a lawful destination.
Handle handover without losing the consent trail
At developer-to-owner or association handover, prepare a schedule of assets, permissions, applications, notices, test reports, service contracts and outstanding defects. Identify the effective handover date and the person taking operational control.
A private handover deed does not automatically amend a consent issued in the developer's name. The incoming responsible entity should use KSPCB's current process to obtain the appropriate transfer, name change, endorsement or fresh permission as applicable. Submit the ownership or management change documents and retain the authority's acknowledgement and decision. Do not invent a universal automatic transfer period.
Replacing an operating contractor is different from changing the legal consent holder. The plant may remain under the same owner, but the incoming contractor still needs drawings, operating instructions, maintenance history, sampling obligations and access to alarms. Keep the outgoing operator responsible for a documented final status report.
If the owner and association disagree about defects, the plant still needs an interim operating arrangement. A dispute over who will pay does not justify untreated discharge. Agree emergency funding, competent supervision and corrective measures while resolving the contractual claim separately.
Give the tenant a clear escalation process
A lease should address access to compliance records, notice of failures, responsibility for changes and emergency wastewater management. Request prompt notification of any regulator's notice or treatment interruption affecting the premises. The tenant should also notify the manager before changing a canteen, adding equipment or increasing wastewater-generating activities.
An assureOffice adviser can use this review to distinguish missing landlord documents from the client's own opening tasks. A completed financial or lease checklist should not be described as engineering approval of the STP.
For a practice working through assureoffice.in, the practical deliverable is a dated document request and an unresolved-issues list: what is missing, who must provide it and what prevents occupation or expansion. The pollution consent and technical performance evidence must still come from the relevant authorities, owner and competent specialists.
Frequently asked questions
1. Does an occupancy certificate prove that the STP has operating consent?
No. Obtain the actual pollution operating permission and its conditions. Building occupancy approval and KSPCB consent address different matters, even where the building approval process required pollution documents at an earlier stage.
2. Must each ordinary office tenant hold a separate STP consent?
Not automatically. Check whether the building's authorised common arrangement covers the tenant and its wastewater. Separate activities, new discharges or unapproved connections can change the answer; a lease clause alone does not establish coverage.
3. Can we rely on another building's common STP approval?
Only if the shared arrangement lawfully includes this building and its load. Verify the approval scope, connection, capacity allocation and agreement. A plant's physical closeness does not prove that it may receive the office's sewage.
4. Is the old 2,000-square-metre commercial threshold universal?
No. The March 2024 table distinguishes qualifying sewered areas from unsewered areas and includes a sewage-volume trigger in sewered areas. Later building requirements and site-specific conditions must also be considered.
5. Does a nearby sewer remove the need for an existing STP?
No automatic conclusion follows. Establish an authorised connection, the relevant treatment infrastructure and applicable approvals. Existing installed systems and later building conditions require specific review before any change or shutdown.
6. Does increasing office occupancy require a capacity review?
Yes. Reassess the building's combined wastewater volume and characteristics against its approved water balance and actual treatment capability. More shifts or expanded canteens can matter even without an increase in built-up area.
7. Is installed capacity the same as effective capacity?
No. Equipment condition, loading, process stability and maintenance affect actual treatment. The nameplate should be supported by operating evidence and a competent assessment of whether required quality is consistently achieved.
8. Who arranges sampling when a contractor operates the STP?
The contract should assign the task, while the consent holder remains responsible for meeting the applicable conditions. Specify laboratory arrangements, sampling points, frequency, result review and corrective action rather than leaving these duties implicit.
9. Is one passing laboratory report sufficient?
It is useful evidence, but not proof of continuous compliance. Review the required sampling programme, recent trends, plant operation and any failed results. Check that the sample was taken from the relevant outlet and represents current conditions.
10. Can treated water be discharged into a stormwater drain?
Do not assume so. The authorised disposal route and applicable conditions control. The 2026 building provisions expressly prohibit untreated sewage reaching stormwater drains, water bodies or groundwater; treatment alone does not establish permission for any chosen outlet.
11. Does dual plumbing mean treated water can be used everywhere?
No. Use it for the purposes permitted by the applicable approvals and quality standards. Maintain separation from potable supply and appropriate cross-connection controls. A plumbing system does not itself determine the legally permitted end use.
12. Should a tenant inspect sludge-disposal records?
Yes, as practical due diligence. Obtain the removal quantity, destination and receiving evidence, and check the route against the sludge's characteristics and applicable conditions. Payment to a cleaning contractor does not identify where the material went.
13. Is all STP sludge hazardous waste?
No. Classification requires the relevant characteristics and legal framework. Avoid both automatic hazardous classification and unrestricted disposal. Contamination from non-domestic streams can be particularly important when selecting the lawful route.
14. What changes after developer handover?
Operational responsibility, document custody and sometimes the entity requiring an approval update change. Prepare a full handover schedule and obtain the appropriate KSPCB action. A private conveyance or association resolution does not automatically rewrite an existing consent.
15. Does appointing a new contractor transfer the consent?
Usually the contractor change and consent-holder change are separate questions. Check the actual permission and contractual arrangement. Ensure operational continuity, technical records and sampling responsibilities are transferred even when the legal holder remains unchanged.
16. Can the landlord refuse every pollution document as confidential?
The tenant should negotiate access to sufficient evidence of lawful service and current compliance. Commercial confidentiality can be managed through appropriate arrangements, but a verbal assurance gives the tenant little basis to assess an approval or capacity gap.
17. What if the plant fails for several days?
Use the approved contingency arrangements, promptly arrange competent repairs and follow any applicable reporting or authority directions. Record the failure, interim handling and restoration evidence. Bypassing untreated sewage is not an acceptable default contingency.
18. Does a canteen change ordinary office assumptions?
It can. Food service introduces different flow and pollutant characteristics, including fats and grease. Review pretreatment, water balance and the consent scope before connecting an enlarged or new kitchen to the existing system.
19. What should finance retain with maintenance invoices?
Keep the service scope, completion report, equipment replaced, test results and supporting sludge or wastewater movement evidence where relevant. An invoice proves expenditure; the accompanying records explain whether the required work and lawful handling occurred.
20. What is the minimum sensible pre-lease check?
Identify the correct plant and consent holder, obtain complete current approvals, reconcile capacity with intended occupancy, examine recent performance and confirm the lawful reuse or disposal route. Record any missing evidence and resolve material gaps before committing to the proposed use.