Segregation at source

Geography glossary

Also called: Source segregation, Wet and dry waste segregation · Topic: Geographical Issues: Pollution, Urban Waste, Slums and Land Degradation · NCERT: Beyond NCERT

Meaning

Segregation at source means sorting waste into separate streams at the place where it is made, such as a home, shop or office, before it is collected. Under the Solid Waste Management Rules 2026, the four streams are wet, dry, sanitary and special care.

  • It matters because composting and recycling only work well when waste arrives already sorted.
  • If waste is sorted at the start, much less of it ends up on landfills and old dumps.

Explanation

How it works (cause → process → result)

  • Cause: mixed waste is hard to use.
  • Wet waste such as food and peels rots. Mixed with plastic and glass, it spoils the compost.
  • Dry items like plastic and paper get dirty and wet, so recyclers cannot recover them easily.

  • Untreated waste rots slowly and gives off methane (a gas that traps heat), as seen at the Mahim dump in Mumbai (NCERT Fig. 9.3).

  • Process: sort first, then collect each stream separately.

  • The household or shop keeps separate bins.
  • The city collects door to door in vehicles with separate sections.

  • Each stream goes to its own place. Wet waste goes to composting or biogas. Dry waste goes to recycling.

  • Result: waste becomes a resource.

  • NCERT says waste should be treated as a resource for energy and compost.
  • Under the 2026 Rules, landfill is only for leftover waste, meaning what cannot be processed.

The streams under the SWM Rules 2026

  • The Solid Waste Management Rules 2026 came into force on 1 April 2026. They replaced the 2016 Rules.
  • Waste must be sorted into four streams:
  • Wet: biodegradable waste, which bacteria can break down (kitchen and garden waste).
  • Dry: plastic, paper, metal and glass.
  • Sanitary: used diapers, sanitary pads and similar items.

  • Special care: risky items that need careful handling.

  • The Rules also add environmental compensation, a charge on those who pollute, which follows the polluter pays principle (verify current).

Conditions it needs

  • Changed habits, not just new equipment.
  • In Karnataka, CAG (the national auditor) found segregation at source was not followed in 32 of 35 ULBs (urban local bodies, i.e. city and town councils) it checked.

  • Vehicles had separate sections for wet and dry waste, but collectors still put mixed waste into both.

  • Sorted waste must stay sorted all the way to the plant.

  • A 2022 CAG report found mixed waste reaching processing sites. Only partial sorting was done at 4 of the 9 sites checked.

  • Because of this, recyclables were harder to recover and the compost was of poorer quality.

  • Measuring quality, not just quantity.

  • Under SBM-Urban, waste processing rose from 16% to 80% and door-to-door collection from 44% to over 96%.
  • But these figures count how much waste reaches a plant. They do not show how well it was sorted.

Where it occurs

  • All Indian cities and towns (ULBs): ULBs must arrange separate collection under the SWM Rules 2026. Sanitation is a State subject, so States and cities must build and run the plants.
  • Swachh Bharat Mission-Urban (launched 2 October 2014): pushes segregation as a people's movement.
  • SBM-Urban 2.0 was launched on 1 October 2021, together with AMRUT 2.0.

  • Its goal is at least a 3-star Garbage Free rating for every city.

  • Swachh Survekshan: run by the Department of Urban Development, MoHUA. It scores segregation as part of the "segregation, collection and transport" area.

  • 4,751 cities were surveyed in 2025-26, up from 73 in 2016.

  • Indore heads the Super Swachh League in the more-than-10-lakh category (SS 2024-25).

  • Karnataka: the CAG audit found segregation was not followed in 32 of 35 ULBs.

  • Places where unsorted waste piled up: the legacy dumps (old garbage heaps built up over many years) at Ghazipur, Bhalswa and Okhla (Delhi) and Deonar (Mumbai). They give off methane, catch fire and leak leachate (toxic liquid that seeps out of waste).
  • The collection gap: metros such as Mumbai, Kolkata, Chennai and Bengaluru collect about 90% of their waste. Many smaller towns leave 30–50% uncollected, so sorting there often never begins.

Don't confuse with

  • Sorting at the plant (secondary segregation): waste is sorted after mixed waste reaches a processing site. Segregation at source happens before collection, at the household or shop. Sorting at the plant is partial and gives poor compost.
  • Door-to-door collection: this measures how much waste is picked up (over 96%). Segregation at source measures how well it is sorted. A city can collect almost everything and still collect it mixed.
  • Extended producer responsibility (EPR): under EPR, the producer, importer or brand owner must collect and recycle what they sell (plastic packaging, e-waste, batteries, tyres). Segregation at source is the duty of the waste generator, such as a household or shop.
  • Bio-mining: this cleans up old legacy dumps by digging out and sorting waste that has already been dumped. Segregation at source stops new dumps from forming.

Prelims Hooks

  • The SWM Rules 2026 came into force on 1 April 2026 and replaced the 2016 Rules. They set four streams: wet, dry, sanitary and special care. Trap: "The 2026 Rules require only two-way wet/dry segregation" is FALSE.
  • Under the 2026 Rules, landfill is only for leftover waste, and polluters pay environmental compensation.
  • Swachh Survekshan is run by the Department of Urban Development, MoHUA, not the Ministry of Jal Shakti, and it scores segregation.
  • CAG (Karnataka): segregation at source was not followed in 32 of 35 ULBs, even though vehicles had separate sections.
  • SBM-U figures: processing 16% → 80%, door-to-door collection 44% → over 96%. These count quantity, not how well waste was sorted.
  • Order of events: SBM launched (2 Oct 2014) → SBM-U 2.0 (1 Oct 2021) → single-use plastic ban (1 Jul 2022) → SWM Rules 2026 (1 Apr 2026).

Mains Points

  • Why it is the base of urban waste management (GS-III):
  • Composting, biogas and recycling all depend on clean, sorted streams.
  • Mixed waste ends up in low-lying landfills. There it gives off methane, catches fire and leaks leachate into groundwater, as at Ghazipur and Deonar.

  • Sorting at source turns NCERT's "waste as a resource" idea into practice. It also eases the load on legacy dumps.

  • Why it fails on the ground:

  • Habits are hard to change. CAG found mixed waste going into two-section vehicles and reaching plants.
  • Rankings and processing figures count tonnes handled, not how well waste is sorted.

  • The money is not being spent. About 68% of SBM-U 2.0's central share of ₹76,760 crore was still unspent in August 2025, and sanitation is a State subject.

  • Policy responses:

  • Give more weight in rankings to sorting quality, checked on site at the plant gate.
  • Get citizens involved through campaigns and school lessons on plastic waste.
  • Charge environmental compensation under the SWM Rules 2026.
  • Use EPR so producers take back the dry fractions.
  • Bring informal recyclers, the waste pickers who already sort dry waste, into city systems.

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