Scope 3 Emissions From Waste: Building a Defensible Number for Your Sustainability Report

Updated: November 01, 2026 · 17 min read

SEBI’s BRSR Core circular of 12 July 2023 set a quiet countdown for India’s largest listed companies: assured Scope 3 disclosure becomes mandatory for the top 150 entities from FY 2026-27. For most sustainability teams, Category 5 — waste generated in operations — has been the number they estimated on a spreadsheet at midnight before the annual report deadline. That approach will not survive third-party assurance. Auditors are already asking for primary waste-contractor data, CPCB authorisation certificates, and written boundary justifications. Companies that cannot produce them are having their Scope 3 figures qualified or omitted entirely, which is arguably worse than a high number.

What GHG Protocol Category 5 Actually Requires — and What Indian Reporters Get Wrong

The GHG Protocol Corporate Standard defines Category 5 as emissions from the disposal and treatment of solid and liquid waste generated by the reporting company’s operations during the reporting year. The boundary is unambiguous: it ends at the gate of the treatment or disposal facility, not at the point where your waste contractor collects it from your factory floor. What happens inside the landfill, the effluent treatment plant, or the recycling shed is Category 5’s domain.

The most common mistake Indian reporters make is conflating waste sent off-site with waste disposed of. If your company dispatched 200 tonnes of mixed industrial scrap to a trader in FY 2025-26 and has no onward documentation, you do not know whether it went to a smelter, an informal dismantler, or an open dump. The GHG Protocol requires you to use the most representative end-of-life treatment method — which, without evidence, defaults to landfill in most Indian emission-factor databases. That single data gap can add tens of tonnes of CO₂e to your reported figure unnecessarily, or worse, cause you to under-report if you assumed landfill when the actual outcome was incineration with energy recovery, which carries different — and country-specific — emission factors.

A second misunderstanding concerns the reporting year boundary. Category 5 covers waste generated during the reporting year, regardless of when it is ultimately treated. If 50 tonnes of hazardous waste generated in Q4 FY 2025-26 is still sitting in an approved storage facility as of 31 March 2026, you still attribute the estimated treatment emissions to FY 2025-26 using the most likely disposal pathway — you do not defer it to next year’s report.

BRSR Core FY 2026-27: Why Category 5 Is No Longer Optional for the Top 150

SEBI’s circular dated 12 July 2023 introduced the Business Responsibility and Sustainability Reporting (BRSR) Core framework, which separates a subset of Key Performance Indicators from the broader BRSR schedule and subjects them to mandatory reasonable assurance. The top 150 listed companies by market capitalisation were required to begin assured BRSR Core reporting from FY 2023-24; the mandate cascades to the top 250 from FY 2024-25 and to the top 500 from FY 2025-26. From FY 2026-27, SEBI has signalled an expectation that Scope 3 value-chain disclosures — including Category 5 — be included within the assured perimeter for the leading cohort.

This is a material shift. Under voluntary BRSR, companies could note Scope 3 as “not applicable” or “under assessment” and face no direct consequence. Under assured BRSR Core, an assurance provider that cannot obtain sufficient evidence for a disclosed number must either issue a qualified opinion or require the company to withdraw the figure. Neither outcome is commercially palatable for a listed entity. The reputational and investor-relations implications are significant enough that several large-cap ESG teams in Mumbai and Bengaluru began back-filling FY 2024-25 Category 5 data in early 2026 precisely to avoid being caught short at the FY 2026-27 assurance gate.

For companies subject to the Ministry of Environment, Forest and Climate Change (MoEFCC) notifications — including those generating hazardous waste under the Hazardous and Other Wastes (Management & Transboundary Movement) Rules, 2016 — there is an added layer of regulatory alignment. Rule 4 of those Rules requires the occupier to maintain records of hazardous waste generation, storage, and disposal in Form 3. That Form 3 data is the natural primary source for Category 5 hazardous waste sub-categories, and an assurance provider will expect to reconcile your GHG inventory against it.

Emission Factors: Landfill vs. Recycling vs. Incineration in the Indian Context

Choosing the right emission factor is where Category 5 calculations either become defensible or become fiction. The GHG Protocol recommends using national emission factors where available, followed by regional proxies, followed by global defaults. For India, the primary published source is the Central Pollution Control Board (CPCB), supplemented by MoEFCC’s national GHG inventory submissions to the UNFCCC and IPCC Tier 1 defaults where Indian data is absent.

Key Emission Factors for Indian Waste Streams (Indicative, Based on Published Data Through 2024)

Waste Type & Treatment Route	Indicative Emission Factor	Source Basis	Key Assumption
Mixed municipal solid waste — landfill (no gas capture)	~0.50 tCO₂e / tonne	IPCC Tier 1 / India National GHG Inventory	Wet waste fraction ~50%; no landfill gas capture
Mixed municipal solid waste — landfill (with gas capture)	~0.22 tCO₂e / tonne	IPCC Tier 1 adjusted	60% gas capture efficiency assumed
Paper / cardboard — mechanical recycling	~0.02–0.04 tCO₂e / tonne	GHG Protocol guidance; UK DEFRA proxy	Transport to recycler included; excludes avoided emissions
Ferrous scrap — secondary smelting	~0.01 tCO₂e / tonne	Ministry of Steel / World Steel data	Electric arc furnace route; grid intensity ~0.71 kg CO₂/kWh (India 2023–24)
E-waste — authorised dismantling & refining	~0.03–0.08 tCO₂e / tonne	CPCB E-Waste data; UNEP estimates	Authorised facility; no open burning
Hazardous waste — incineration (TSDF)	~1.2–2.5 tCO₂e / tonne	IPCC Tier 2 / waste composition-dependent	Varies significantly by chlorine and organic content
Food / organic waste — composting	~0.10 tCO₂e / tonne	IPCC Tier 1	Aerobic composting; methane credit not claimed

The grid emission factor deserves particular attention for e-waste and metals recycling calculations. The Bureau of Energy Efficiency (BEE) published a national grid emission factor of approximately 0.71 kg CO₂ per kWh for FY 2023-24, which is the most recent officially published figure available as of the date of this article. Use this figure for any Category 5 sub-category where electricity consumption at the treatment facility drives the emission calculation. Do not use global defaults of 0.4–0.5 kg CO₂/kWh — India’s coal-heavy grid makes the under-estimation material.

For ferrous and non-ferrous scrap specifically, companies whose waste goes to secondary smelters should request the facility-specific emission intensity from their recycler. The Ministry of Steel has been pushing electric arc furnace adoption under its National Steel Policy, and EAF-based secondary steelmakers typically have facility-level emissions data they are prepared to share with large B2B customers seeking BRSR documentation.

The Vendor Data Problem: Why Your Waste Contractor’s Word Is Not Enough

The weakest link in most Indian companies’ Category 5 calculations is the waste contractor. A common scenario: a facility in Pune contracts with a local waste aggregator who issues a single receipt saying “500 kg scrap removed.” No onward chain-of-custody. No end-destination. No weight ticket from the recycling facility. For a finance controller signing off on a GHG inventory, that receipt is not evidence — it is a claim.

Assurance providers conducting BRSR Core reviews are applying three tests to waste vendor data. First, is the vendor CPCB-authorised (or SPCB-authorised, as appropriate) for the category of waste in question? The E-Waste (Management) Rules, 2022 require dismantlers and recyclers to hold CPCB authorisation under Rule 16. The Hazardous and Other Wastes (Management & Transboundary Movement) Rules, 2016 require transporters and disposal facility operators to hold authorisation under Rule 6. If your vendor cannot produce these certificates, your waste’s end-of-life treatment pathway is unverified. Assurance providers will default your emission factor to landfill — the highest plausible value — or exclude the figure entirely.

Second, does the vendor issue a GST-compliant tax invoice? Under the Goods and Services Tax framework, scrap transactions carry specific HSN codes — for instance, HSN 7204 for ferrous waste and scrap. A GST invoice with the correct HSN code creates a traceable financial record that corroborates the physical waste flow. Companies that accept cash receipts or informal acknowledgements are creating a documentation gap that will show up in both GHG audits and income tax scrutiny simultaneously. You can review applicable HSN classification guidance on the GST portal.

Third, does the vendor provide a certificate of recycling or a mass-balance statement? This is the document that actually tells you what fraction of your waste was mechanically recycled, what fraction was landfilled, and what fraction was incinerated. Without it, you are guessing at the emission factor split. For companies managing e-waste, our CPCB-authorised e-waste recycling service includes a certificate of destruction and a recycling outcome statement — precisely the format assurance providers look for.

Avoided Emissions Claims — and Why They Keep Getting Challenged

Avoided emissions — the GHG savings achieved by routing waste to recycling rather than landfill — are appealing to sustainability communications teams. They are also a perennial source of conflict between reporters and assurance providers. The GHG Protocol is explicit: avoided emissions are not a Scope 3 category and must not be netted against Category 5 gross figures in the primary inventory. They may be disclosed separately, outside the Scope 1/2/3 totals, clearly labelled as “additional information” and with full methodology disclosure.

In practice, Indian sustainability reports frequently present avoided emissions in a way that obscures whether they are being netted or disclosed separately. Assurance providers — particularly those following ISAE 3000 or AA1000AS standards — are flagging this as a misstatement risk. Two specific claims draw the most scrutiny. The first is claiming avoided emissions from sending ferrous scrap to secondary steel producers, on the grounds that secondary steelmaking avoids the emissions of primary blast furnace production. This calculation requires the reporter to justify a specific primary steel baseline emission factor, which varies by process route and geography. Using a global average to maximise the avoided figure will not survive a challenge from a technically literate auditor.

The second contested claim is credits for e-waste sent to authorised recyclers under the E-Waste (Management) Rules, 2022. The Rules create an EPR credit mechanism for producers, but those credits relate to extended producer responsibility targets — not to GHG accounting. Conflating EPR credits with avoided emission credits is a category error that assurance providers will not let pass. If you want to claim avoided emissions from e-waste recycling, you need a separate calculation grounded in the recycled material’s displaced primary production, not the EPR registry balance.

Companies seeking to disclose avoided emissions responsibly should use the GHG Protocol’s guidance on beyond-value-chain mitigation and clearly state: (a) the waste quantity and treatment route; (b) the counterfactual disposal pathway assumed; (c) the emission factors used for both actual and counterfactual; and (d) whether the recycler’s authorisation was verified. Our EPR compliance and recycling documentation service can provide the underlying data for all four disclosures.

The 7-Step Checklist for a Defensible Category 5 Number

Third-party assurance providers reviewing BRSR Core Scope 3 disclosures in FY 2026-27 will walk through a structured evidence trail. The following checklist, drawn from GHG Protocol Category 5 guidance, ISAE 3000 assurance expectations, and the documentation requirements of the Hazardous and Other Wastes (Management & Transboundary Movement) Rules, 2016 and the E-Waste (Management) Rules, 2022, represents the minimum standard your team should meet this quarter.

1. Map every waste stream by type and quantity. Categorise by waste type (hazardous, non-hazardous, e-waste, plastic, ferrous scrap, food waste, construction debris) and record the quantity in tonnes for FY 2025-26 as a baseline. Cross-check against your Form 3 hazardous waste returns filed under the Hazardous and Other Wastes Rules, 2016, and against EPR returns filed on the CPCB EPR portal for plastic waste under the Plastic Waste Management Rules, 2016 (as amended).
2. Verify CPCB / SPCB authorisation for every waste vendor. Request a copy of each vendor’s current authorisation certificate. Note the expiry date. Vendors whose authorisations have lapsed or whose scope does not cover your waste category cannot provide valid chain-of-custody documentation for GHG purposes. Authorisation lists are publicly accessible on the CPCB hazardous waste portal.
3. Obtain end-of-life treatment confirmation in writing. For each vendor, request a signed statement specifying the treatment route — mechanical recycling, incineration, composting, secure landfill, or other — and the receiving facility’s name and registration number. Where a waste aggregator is involved, this statement must come from the final treatment facility, not the aggregator.
4. Collect GST-compliant invoices with correct HSN codes. Reconcile the tonnage on GST invoices against your internal dispatch records. Unexplained differences of more than 5% will be flagged by assurance providers as a completeness risk.
5. Select emission factors with explicit justification. Document which database you used (CPCB, IPCC AR6, UK DEFRA, or facility-specific), the factor value, the unit, and the year of the factor. If using an Indian grid emission factor for electrically intensive treatment processes, use BEE’s most recently published figure (0.71 kg CO₂/kWh for FY 2023-24 as the latest available).
6. Disclose avoided emissions separately — never netted. If you choose to present avoided emissions from recycling, place them in a separate table clearly marked “outside Scope 1/2/3 boundary” and include the counterfactual assumption, the emission factor used, and the source recycler’s authorisation reference. Review this presentation with your assurance provider before finalising the report.
7. Retain all supporting documentation for a minimum of 3 years. The Hazardous and Other Wastes Rules, 2016 mandate a 5-year retention period for hazardous waste records. Even for non-hazardous waste, SEBI’s BRSR assurance expectations and standard audit practice recommend retaining GHG evidence for at least 3 financial years to support comparative disclosures and potential regulatory enquiries.

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Frequently Asked Questions

Is Category 5 (waste generated in operations) mandatory under SEBI’s BRSR Core framework in 2026?

For the top 150 listed entities by market capitalisation, SEBI’s BRSR Core circular of 12 July 2023 mandates assured Scope 3 disclosure from FY 2026-27. Category 5 falls within Scope 3, and assurance providers are increasingly requiring primary evidence — vendor authorisation certificates, treatment confirmation letters, and GST invoices — rather than accepting estimated or modelled figures. Companies in the top 250 and 500 cohorts face the same requirement on a phased timeline and should begin data collection this financial year.

What emission factor should I use for waste going to Indian landfills?

In the absence of a facility-specific factor, use the IPCC Tier 1 default adjusted for Indian conditions, which yields approximately 0.50 tCO₂e per tonne of mixed municipal waste at a landfill with no gas capture — the condition at the majority of Indian dumpsites. If the landfill has gas capture infrastructure, a factor of approximately 0.22 tCO₂e per tonne is defensible with site documentation. Always state the source, the year of the factor, and the assumption about the organic fraction of your waste.

Can I claim avoided emissions from sending scrap metal to a recycler in my Scope 3 report?

Not within the Scope 3 boundary. The GHG Protocol is explicit that avoided emissions are not a Scope 3 category under the Corporate Standard and must not be netted against Category 5 gross figures. You may disclose avoided emissions separately, outside your Scope 1/2/3 totals, clearly labelled as additional information. This disclosure must include the counterfactual disposal pathway, the emission factors used for both routes, and evidence of the recycler’s CPCB or SPCB authorisation.

Which Indian regulation governs the documentation I need from my hazardous waste recycler?

The Hazardous and Other Wastes (Management & Transboundary Movement) Rules, 2016 (as notified by MoEFCC) govern both the recycler’s authorisation (Rule 6) and your obligation to maintain records in Form 3. The occupier must retain these records for 5 years. For e-waste specifically, the E-Waste (Management) Rules, 2022 require dismantlers and recyclers to hold CPCB authorisation under Rule 16 and to issue certificates of processing, which serve as the primary evidence document for GHG Category 5 reporting.

What happens if my waste vendor is not CPCB-authorised — does it affect my GHG report?

Yes, in two ways. First, an assurance provider reviewing your BRSR Core Scope 3 disclosure will treat unverified end-of-life treatment as a completeness and accuracy risk. They will either qualify their opinion or require you to default to the highest plausible emission factor (typically open landfill) for that waste stream, which increases your reported figure. Second, routing waste through an unauthorised vendor exposes the occupier to regulatory liability under the Hazardous and Other Wastes Rules, 2016, with penalties of up to ₹1 lakh per day of non-compliance under the Environment Protection Act, 1986.

Work With The National Recycling Corporation

Building a defensible Category 5 number starts with knowing where your waste actually goes. The National Recycling Corporation operates a pan-India collection and recycling network covering Maharashtra (including Mumbai and Thane), Gujarat, Delhi-NCR, Karnataka, Tamil Nadu, and Telangana, with authorised disposal partners for ferrous and non-ferrous metals, e-waste, plastics, paper, and general industrial scrap. Every transaction is backed by a GST-compliant tax invoice with the correct HSN classification — the financial record your assurance provider will ask to see first.

For companies preparing BRSR Core submissions in FY 2026-27, we issue BRSR-grade documentation packages: a certificate of recycling or destruction, a mass-balance statement specifying the treatment route and recovered material fractions, a copy of our relevant CPCB authorisation, and a signed chain-of-custody declaration. These four documents address the primary evidence gaps that assurance providers identify in Indian Category 5 disclosures. For metal scrap, our pricing is indexed to London Metal Exchange benchmarks, ensuring fair-market value alongside compliance rigour. You can review the full range of materials we accept on our scrap buying page, and learn more about our approach to industrial waste on our full-service waste dealer page.

If you are a company secretary or sustainability head building your Category 5 data pack ahead of the FY 2026-27 assurance window, the time to establish vendor documentation protocols is now — not in February 2027. Contact us to discuss a documentation agreement, schedule a pan-India pickup, or request a sample compliance certificate to share with your assurance provider.

• Pan-India industrial scrap and waste collection — scheduled or on-call
• CPCB-authorised recycling and disposal partners for hazardous, e-waste, and general waste streams
• GST-compliant invoicing with correct HSN codes for all scrap categories
• Certificate of recycling / destruction issued within 5 working days of collection
• BRSR-grade documentation: mass-balance statement, chain-of-custody declaration, authorisation copies
• Metal pricing indexed to LME benchmarks — copper, aluminium, stainless steel, brass, mild steel
• Category 5 data support: treatment route confirmation letters and emission factor guidance for your GHG inventory team

Sources and References

• Central Pollution Control Board (CPCB) — Official Portal
• Ministry of Environment, Forest and Climate Change (MoEFCC) — Hazardous Waste Rules and National GHG Inventory
• CPCB E-Waste Portal — E-Waste (Management) Rules, 2022 and Authorisation Lists
• CPCB EPR Portal — Plastic Waste Management Rules, 2016 (as amended), EPR Registration and Returns
• Ministry of Steel, Government of India — National Steel Policy and Secondary Steel Data
• NITI Aayog — Circular Economy and Sustainability Policy Framework
• Goods and Services Tax Portal — HSN Code Classification for Scrap and Waste
• London Metal Exchange — Benchmark Pricing for Copper, Aluminium, and Other Non-Ferrous Metals