Scope 3 Category 5: Waste Generated in Operations Explained
Scope 3 Category 5: Waste Generated in Operations — A Complete Guide
Scope 3 Category 5 covers emissions from the disposal and treatment of solid waste and wastewater generated by the reporting company's operations, where the treatment occurs at third-party (off-site) facilities. This category is one of the most consistently underestimated in corporate GHG inventories — most businesses produce waste daily, but few have calculated the emissions associated with its treatment.
Under GHG Protocol Corporate Value Chain (Scope 3) Standard, Category 5 is mandatory to account for if material (greater than 5% of total Scope 3 emissions or 1% of total GHG emissions).
What Waste Streams Are Included in Category 5?
Category 5 covers all solid and liquid waste generated by your operations and sent off-site for:
| Waste Type | Treatment Method | Included? |
|---|---|---|
| --- | --- | --- |
| General waste | Landfill | Yes |
| General waste | Incineration (energy from waste) | Yes |
| Paper and cardboard | Recycling | Yes |
| Plastics | Recycling | Yes |
| Metals | Recycling | Yes |
| Glass | Recycling | Yes |
| Food and organic waste | Landfill or composting or anaerobic digestion | Yes |
| Hazardous waste | Specialist treatment | Yes |
| Wastewater (trade effluent) | Sewage treatment | Yes |
| Construction and demolition waste | Mixed recovery | Yes |
Not included in Category 5: - Waste treatment at your own on-site facility (that would be Scope 1 if combustion occurs) - Product waste at customer sites after you sell a product (that's Category 12) - Waste from your supply chain (that's your supplier's Category 5)
UK Waste Emission Factors (DEFRA 2023)
DEFRA publishes waste emission factors in its annual GHG Conversion Factors document. Key factors for 2023/24:
| Waste Stream | Landfill | Combustion (EfW) | Open-Loop Recycling |
|---|---|---|---|
| --- | --- | --- | --- |
| Mixed waste (bulk) | 0.587 kgCO2e/kg | 0.021 kgCO2e/kg | n/a |
| Food and drink waste | 0.584 kgCO2e/kg | 0.023 kgCO2e/kg | n/a (composting: 0.001) |
| Paper and board | 1.296 kgCO2e/kg | 0.021 kgCO2e/kg | -0.753 kgCO2e/kg |
| Plastics (mixed) | 0.024 kgCO2e/kg | 2.850 kgCO2e/kg | -0.356 kgCO2e/kg |
| Glass | 0.010 kgCO2e/kg | n/a | -0.033 kgCO2e/kg |
| Metals (mixed) | 0.003 kgCO2e/kg | n/a | -1.477 kgCO2e/kg |
| Organic waste composting | n/a | n/a | 0.008 kgCO2e/kg |
Key insight: Paper sent to landfill (1.296 kgCO2e/kg) emits 1,700× more than paper sent to recycling (-0.753 kgCO2e/kg with avoided emissions credit). Recycling is not just environmentally beneficial — it materially reduces your Scope 3 Category 5 footprint.
How to Calculate Your Category 5 Waste Emissions
Step 1 — Obtain Waste Data
Sources for waste consumption data: - Waste management contractor invoices (show tonnage collected by stream) - Skip hire records (volume and weight estimates per collection) - Waste Transfer Notes (legally required in the UK for all commercial waste movements — show waste type and disposal route) - Environmental permit returns (if your premises has an environmental permit)
Typical data points from a waste invoice: - 2.4 tonnes general waste (landfill) per quarter = 9.6 tonnes/year - 1.1 tonnes paper/cardboard (recycled) per quarter = 4.4 tonnes/year - 0.3 tonnes food waste (AD) per quarter = 1.2 tonnes/year
Step 2 — Apply Emission Factors
Worked example — 80-person office, one year:
| Waste Stream | Quantity | Route | Factor | tCO2e |
|---|---|---|---|---|
| --- | --- | --- | --- | --- |
| General waste | 9.6 tonnes | Landfill | 0.587 kg/kg | 5.64 |
| Paper/cardboard | 4.4 tonnes | Recycling | -0.753 kg/kg | -3.31 |
| Food waste | 1.2 tonnes | AD | 0.001 kg/kg | 0.001 |
| Plastics | 0.8 tonnes | Recycling | -0.356 kg/kg | -0.28 |
| Total Category 5 | 2.06 tCO2e |
For a typical office, Category 5 represents 3–8% of total Scope 3 emissions — material enough to report, but not the largest category.
Category 5 for Manufacturing and Food Businesses
For manufacturers, food processors, and hospitality businesses, Category 5 can be much more significant:
Food manufacturer with 500 tonnes food waste/year: - 500,000 kg × 0.584 kgCO2e/kg (landfill) = 292 tCO2e - Same food waste sent to AD: 500,000 kg × 0.001 = 0.5 tCO2e - Carbon saving from waste diversion: 291.5 tCO2e
This demonstrates why food waste is the highest-priority waste reduction target for food businesses — the carbon and cost savings are both substantial.
GHG Protocol Requirements for Category 5
The GHG Protocol Scope 3 Standard requires: - Use of mass-based calculation (tonnes of waste × emission factor by disposal route) - Disclose quantity by waste type and disposal method - Use year-specific waste emission factors (DEFRA updates annually) - If waste management data is unavailable, estimate using spend-based or employee-based proxy methods
Where to report Category 5: - GHG Protocol Scope 3 inventory (Category 5 line) - CDP environmental questionnaire (Waste section) - CSRD ESRS E1-6 (Scope 3 material categories) - SECR (optional for Scope 3 — disclose if material)
DeCarbonOPS includes a full Scope 3 Category 5 waste calculator. Enter your waste volumes by stream and disposal route — the platform applies DEFRA 2023 waste emission factors automatically and includes Category 5 in your Carbon Passport and CSRD-ready PDF report. Start free.
Frequently Asked Questions
What is Scope 3 Category 5 under GHG Protocol?
Scope 3 Category 5 (Waste Generated in Operations) covers greenhouse gas emissions associated with the disposal and treatment of solid waste and wastewater generated at facilities or offices owned or controlled by the reporting company, where treatment takes place at third-party facilities. It includes landfill, incineration, recycling, composting, and anaerobic digestion of waste materials. It does not include waste generated by the company's value chain (upstream or downstream).
What waste emission factors should UK businesses use?
UK businesses should use DEFRA's annual GHG Conversion Factors for waste emission factors. Key factors from DEFRA 2023: general mixed waste to landfill 0.587 kgCO2e/kg; food waste to landfill 0.584 kgCO2e/kg; paper to landfill 1.296 kgCO2e/kg; paper to recycling -0.753 kgCO2e/kg (negative = avoided emissions credit); plastics to incineration 2.850 kgCO2e/kg. DEFRA updates these factors annually — use the year-matching your reporting period.
Do I need to include recycling in my Scope 3 Category 5 calculation?
Yes. Recycled materials are included in Category 5 — but they typically have negative or near-zero emission factors because recycling avoids primary material production. Under the open-loop recycling method (default in DEFRA factors): paper recycling has a factor of -0.753 kgCO2e/kg (credit for avoided virgin paper production); metal recycling -1.477 kgCO2e/kg (credit for avoided smelting). Including recycling in your calculation makes your Category 5 total more accurate and often lower than landfill-only reporting.
Where do I find my company's waste data for Category 5?
Your commercial waste data comes from: (1) Waste management contractor invoices — show tonnage collected per stream per quarter; (2) Waste Transfer Notes — legally required for all UK commercial waste collections, showing weight and disposal route; (3) Skip hire records — volume and estimated weight per collection; (4) Environmental permit annual returns if you hold a permit. If no tonnage data is available, use a proxy: 80-person offices typically generate 8–14 tonnes of mixed waste per year.
How significant is Category 5 in a typical company's Scope 3 footprint?
For office-based businesses, Category 5 typically represents 2–8% of total Scope 3 emissions — material but rarely the largest category. For manufacturers, hospitality, food businesses, and hospitals, waste can be 10–20% of Scope 3 or more. A food manufacturer sending 500 tonnes of food waste to landfill annually generates 292 tCO2e from Category 5 alone — comparable to its entire Scope 1 and 2. Diverting food waste to anaerobic digestion (AD) reduces this to under 1 tCO2e — a 291 tCO2e reduction from waste rerouting alone.
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