GeographyCBSE Class 12 · Geographical Perspective on Selected Issues and Problems

Urban Waste Disposal in India (Class 12 Geography, India: People and Economy, Chapter 9)

Updated 16 October 2026 · Fact-checked

Urban solid waste comes from households and from industrial or commercial establishments. In metropolitan cities such as Mumbai, Kolkata, Chennai and Bengaluru about 90 per cent is collected, but in most other cities 30 to 50 per cent is left uncollected, breeding disease carriers. NCERT says wastes should be treated as a resource for energy and compost.

Understand Urban Waste Disposal

Why this topic matters. The syllabus lists "Urban waste disposal" under Chapter 9. CBSE has asked solid waste as a 5-mark answer and the Daurala case study as a source-based item, so know the sources, the numbers and the remedies. The chapter has no map item (the syllabus lists Nil for Chapter 9).

1. The urban setting. Urban areas are generally marked by overcrowding, congestion, inadequate facilities for the fast-growing population, poor sanitary conditions and foul air. Environmental pollution by solid wastes has gained significance because of the enormous growth in the quantity of waste.

2. What solid waste is.

A variety of old and used articles: for example stained small pieces of metals, broken glassware, plastic containers, polythene bags, ash, floppies and CDs dumped at different places; also termed refuse, garbage and rubbish.
Two sources: (i) household or domestic establishments and (ii) industrial or commercial establishments.
Household wastes are disposed of on public lands or on private contractors' sites; industrial wastes are collected and disposed of through public (municipal) facilities at low-lying public grounds (landfill areas).
The huge turn-out of ash and debris from industries, thermal power houses and building construction or demolition has posed problems of serious consequences.

3. Hazards.

Wastes cause obnoxious smell and harbour flies and rodents, which carry typhoid, diphtheria, diarrhoea, malaria and cholera; carelessly handled wastes are spread by wind and splashed by rain water.
The concentration of industrial units in and around urban centres creates industrial waste; dumping industrial waste into rivers causes water pollution. River pollution from city-based industries and untreated sewage leads to serious health problems downstream.

4. The Indian picture.

Urban waste disposal is a serious problem. In metropolitan cities such as Mumbai, Kolkata, Chennai and Bengaluru, about 90 per cent of solid waste is collected and disposed of.
In most other cities and towns, 30 to 50 per cent of the waste generated is left uncollected, accumulating on streets, in open spaces between houses and on wastelands, leading to serious problems.
Wastes should be treated as a resource and used to generate energy and compost. Untreated wastes ferment slowly and release toxic biogas, including methane, to the atmosphere.

5. Case study: Daurala (near Meerut).

The "polluter pays" principle guided a people's-participation effort led by a Meerut-based NGO, with industry officials, government officials and others, to restore the ecology and protect health of the roughly 12,000 residents.
In 2003 the civil society's attention was drawn to the village: groundwater was contaminated with heavy metals because untreated waste water of Daurala industries leached into the groundwater table. The NGO surveyed health door to door.
Remedies: the overhead water tank's capacity was enhanced and a 900 m extra pipeline laid for potable water; the silted pond was desilted and recharged, recharging the aquifers; rainwater harvesting structures were built, helping to dilute the contaminants after the monsoon; 1,000 trees were planted.

Inference (ours, not NCERT). NCERT gives no figures for total waste generated and no reasons for the lower collection in smaller cities; any such reason, and any claim that landfills could leach as at Daurala, is our inference.

Key quotations

Short lines worth knowing by heart: who says them, when, and why they matter.

These wastes should be treated as resource and utilised for generating energy and compost.
NCERT, India: People and Economy, Chapter 9: Section "Urban Waste Disposal".
The textbook's positive approach to urban waste.

Urban Waste Disposal: key facts

Solid waste: Old and used articles
refuse, garbage, rubbish
sources: household, industrial or commercial
household: public lands, private contractors' sites
industrial: municipal low-lying landfills; Ash and debris from industries, thermal power houses and construction are a serious problem.
Collection figures: Metros (Mumbai, Kolkata, Chennai, Bengaluru): about 90 per cent collected | other cities: 30 to 50 per cent uncollected; Uncollected waste piles on streets, open spaces and wastelands.
Hazards: Smell
flies and rodents
typhoid, diphtheria, diarrhoea, malaria, cholera
industrial waste dumped into rivers
untreated waste releases methane; Downstream health problems from city-based industries and untreated sewage.
Daurala: Polluter pays
NGO at Meerut
2003
heavy metals in groundwater
12,000 residents
900 m pipeline
pond desilted
rainwater harvesting
1,000 trees; Cause: untreated waste water of industries leaching to the groundwater table.

How to answer Urban Waste Disposal questions

Urban waste answers should move from sources to hazards to the Indian pattern to remedies. Quote the two collection figures and label any reasoning NCERT does not give.

1Define solid waste with two or three NCERT examples and name the two sources.
2Give the different disposal routes of household and industrial wastes.
3Add the hazards: smell, flies and rodents with their diseases, water pollution from industrial dumping, methane from untreated waste.
4Quote the Indian pattern: about 90 per cent collected in metros; 30 to 50 per cent uncollected elsewhere.
5Close with the remedy NCERT gives (resource for energy and compost) or the Daurala steps.

Urban Waste Disposal in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Uncollected waste

Suppose in a mid-sized town garbage piles up in the open spaces between houses for weeks, and flies and rats breed in it.

What does NCERT say about such waste and the diseases it may carry?

Try it first, then show the solutionSolution

In most cities and towns 30 to 50 per cent of the waste generated is left uncollected and accumulates in streets, open spaces between houses and wastelands.
Wastes harbour flies and rodents, which carry typhoid, diphtheria, diarrhoea, malaria and cholera.

Answer: Uncollected waste causes serious problems and harbours flies and rodents that carry diseases such as typhoid, diphtheria, diarrhoea, malaria and cholera.

Memory hook: Piles breed pests.

Industrial waste and downstream towns

Imagine a cluster of factories on the edge of a city that tips its waste into a river, and towns further down the river report more illness.

Which NCERT statements describe this?

Try it first, then show the solutionSolution

The concentration of industrial units in and around urban centres gives rise to disposal of industrial wastes.
The dumping of industrial waste into rivers leads to water pollution; river pollution from city-based industries and untreated sewage leads to serious health problems downstream.

Answer: Industrial waste dumped into rivers pollutes the water, and city-based industries and untreated sewage cause serious health problems downstream.

Memory hook: Down the river, the harm goes.

Tricks to remember Urban Waste Disposal

Short memory aids. Say each one aloud once, then use it on a question the same day.

Two sources, two routes
Household: public lands or private contractors; industrial: municipal low-lying landfills.
Use it when: Disposal of solid waste.
90 vs 30-50
Metros collect about 90 per cent; other towns leave 30 to 50 per cent uncollected.
Use it when: Indian pattern.
Five diseases "T D D M C"
Typhoid, Diphtheria, Diarrhoea, Malaria, Cholera.
Use it when: Diseases carried by flies and rodents.
Daurala "900 and 1,000"
900 m extra pipeline; 1,000 trees; 12,000 residents.
Use it when: Numbers in the case study.

Urban Waste Disposal: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Carriers and diseases · 1 mark · MCQBoard level

Solid wastes harbour flies and rodents that act as carriers of which set of diseases according to NCERT?
(A) Typhoid, diphtheria, diarrhoea, malaria and cholera
(B) Dengue, tuberculosis and polio
(C) Asthma, bronchitis and deafness
(D) Goitre, rickets and scurvy

Try it first, then show the solutionSolution

NCERT: flies and rodents harboured by solid wastes act as carriers of diseases like typhoid, diphtheria, diarrhoea, malaria and cholera (1 mark).

Answer: (A) Typhoid, diphtheria, diarrhoea, malaria and cholera

Example 2: Statements on the hazards and the collection figures · 1 mark · MCQHarder board level

Consider the statements:
I. The ash and debris from industries, thermal power houses and building constructions or demolitions have posed problems of serious consequences.
II. Flies and rodents harboured by solid wastes act as carriers of diseases like typhoid and cholera.
III. In metropolitan cities like Mumbai and Chennai about 30 to 50 per cent of solid waste is left uncollected.
Which are correct?
(A) I and II
(B) II and III
(C) I and III
(D) I, II and III

Try it first, then show the solutionSolution

I and II are NCERT statements.
III is wrong: about 90 per cent is collected in the metros; the 30 to 50 per cent left uncollected refers to most other cities and towns (1 mark).

Answer: (A) I and II

Example 3: Assertion and reason on methane · 1 mark · Assertion-reasonHarder board level

Assertion (A): Untreated urban wastes release toxic biogas, including methane, into the atmosphere.
Reason (R): Untreated wastes ferment slowly.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true but (R) is false.
(D) (A) is false but (R) is true.

Try it first, then show the solutionSolution

NCERT: untreated wastes ferment slowly and release toxic biogas to the atmosphere, including methane.
The slow fermentation is the process that produces the biogas, so R explains A (1 mark).

Answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A).

Example 4: Source-based: how much waste is collected · 3 marks · Source-basedHarder board level

Read the passage: "Urban waste disposal is a serious problem in India. In metropolitan cities like Mumbai, Kolkata, Chennai, Bengaluru, etc., about 90 per cent of the solid waste is collected and disposed. But in most of other cities and towns in the country, about 30 to 50 per cent of the waste generated are left uncollected which accumulate on streets, in open spaces between houses and in wastelands leading to serious problems."
(i) Which of these is a metropolitan city named in the passage? (1)
(A) Jaipur (B) Bengaluru (C) Lucknow (D) Pune
(ii) The share of solid waste in the metropolitan cities that is NOT collected is about: (1)
(A) 10 per cent (B) 30 per cent (C) 50 per cent (D) 90 per cent
(iii) At the lower figure for other towns (30 per cent), the share left uncollected is how many times that in the metros? (1)
(A) 1 time (B) 3 times (C) 9 times (D) 30 times

Try it first, then show the solutionSolution

(i) Bengaluru, so (B) (1 mark).
(ii) Our own subtraction: 100 - 90 = 10 per cent, so (A) (1 mark).
(iii) Our own division: 30 / 10 = 3 times, so (B) (1 mark).

Answer: (i) B; (ii) A; (iii) B

Example 5: Industrial concentration and water · 3 marks · Short answerBoard level

How does the concentration of industrial units in and around urban centres affect rivers and the health of people living downstream? (3 marks)

Try it first, then show the solutionSolution

The concentration of industrial units in and around urban centres gives rise to the disposal of industrial wastes (1 mark).
The dumping of industrial waste into rivers leads to water pollution (1 mark).
River pollution from city-based industries and untreated sewage leads to serious health problems downstream (1 mark).

Answer: When industrial units are concentrated in and around urban centres, large quantities of industrial waste have to be disposed of. Dumping this waste into rivers leads to water pollution, and river pollution from city-based industries and untreated sewage leads to serious health problems downstream.

Example 6: HOTS: could a landfill repeat Daurala? · 5 marks · Long answerHOTS / competency

NCERT says industrial solid wastes are disposed of at low-lying public grounds (landfill areas), and the Daurala case shows untreated industrial waste water leaching into groundwater. Evaluate the risk that badly managed landfills could cause a similar problem, and list the safeguards the Daurala case suggests. Label inference. (5 marks)

Try it first, then show the solutionSolution

NCERT facts (2 marks): industrial wastes go to low-lying landfills; at Daurala untreated waste water of industries leached into the groundwater table and contaminated it with heavy metals.
Inference (1 mark): landfills holding untreated industrial waste could pose a similar leaching risk; NCERT does not say this about landfills.
Safeguards (2 marks): enlarged overhead tank and a 900 m extra pipeline for potable water; desilting and recharging the pond; rainwater harvesting to dilute contaminants; tree planting; the polluter pays principle with people's participation.

Answer: NCERT states that industrial solid wastes are collected and disposed of through municipal facilities at low-lying public grounds (landfill areas), and that at Daurala the untreated waste water of the industries leached into the groundwater table, contaminating it with heavy metals. NCERT does not link the two. Our inference is that a badly managed landfill holding untreated industrial waste could pose a similar leaching risk to groundwater.

The Daurala case suggests safeguards: the capacity of the overhead water tank was enhanced and a 900 m extra pipeline was laid to supply potable water; the silted pond was desilted and recharged so that the aquifers were recharged; rainwater harvesting structures helped dilute the contaminants after the monsoon; 1,000 trees were planted; and the whole effort rested on the "polluter pays" principle with people's participation and industry involvement.

Where students lose marks in Urban Waste Disposal

The slips examiners see most often, and what to write instead.

Mistake: Applying the 30 to 50 per cent uncollected figure to all cities
The two figures come from the same paragraph.
Wrong working
In India, 30 to 50 per cent of urban waste is uncollected, even in Mumbai.
Right working
About 90 per cent is collected in the metros; 30 to 50 per cent is uncollected in most other cities and towns.
Do this: Metros 90; others 30 to 50 uncollected.
Usually costs: 1 mark.
Mistake: Listing three sources of solid waste
Students add transport or agriculture.
Wrong working
Sources: household, industrial and agricultural.
Right working
Two sources: household or domestic establishments, and industrial or commercial establishments.
Do this: Two sources.
Usually costs: 1 mark.
Mistake: Forgetting methane
The remedy part of the answer gets all the attention.
Wrong working
Untreated wastes only create a foul smell.
Right working
Untreated wastes ferment slowly and release toxic biogas, including methane, into the atmosphere, besides smell and disease carriers.
Do this: Smell, pests, methane.
Usually costs: 1 mark.
Mistake: Blaming solid waste for the Daurala contamination
The case sits in the solid-waste section.
Wrong working
Groundwater at Daurala was polluted by garbage dumps.
Right working
The groundwater was contaminated with heavy metals because untreated waste water of Daurala industries leached into it.
Do this: Waste water, not garbage.
Usually costs: 1 mark.

Exam tips

Open with the two sources of solid waste and the two disposal routes; both lines earn marks.
Quote both collection figures (90 per cent in metros; 30 to 50 per cent uncollected elsewhere) and name the four metros.
In a Daurala answer give the cause (untreated waste water leaching) before the remedies.
The questions on this page are our own and are checked by meaning against the chapter page and past papers; they are not copies of board items.

Practice questions on Urban Waste Disposal

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
The Daurala case study of restoring ecology and safeguarding human health took place in a village near which city?
(A) Meerut
(B) Bareilly
(C) Agra
(D) Aligarh
Hint
A Meerut-based NGO led the effort.
Answer
(A) Meerut. NCERT places Daurala near Meerut and says a Meerut-based NGO developed the model.
Q2 · 2 marks · Very short answerHarder board level
If about 90 per cent of solid waste is collected in the metropolitan cities and 30 to 50 per cent is left uncollected elsewhere, find the range of the share collected in the other cities and how many percentage points below the metros' share it lies. (2 marks)
Hint
Subtract from 100, then from 90.
Answer
Collected share in other cities = 100 - 50 = 50 to 100 - 30 = 70 per cent. That is 90 - 70 = 20 to 90 - 50 = 40 percentage points below the metros (our own arithmetic on the NCERT figures).
Q3 · 1 mark · MCQHarder board level
The Daurala case study mentions about 12,000 residents and 1,000 trees planted. Taking both figures as given, about how many residents are there per tree planted?
(A) 1.2
(B) 12
(C) 120
(D) 1,200
Hint
Divide 12,000 by 1,000.
Answer
(B) 12. 12,000 / 1,000 = 12 (our own arithmetic; it shows only the scale of the tree planting, not an NCERT claim).
Q4 · 3 marks · Short answerHarder board level
Classify the Daurala remedial steps under (a) safe water supply, (b) groundwater recharge and dilution of contaminants, and (c) ecological improvement. (3 marks)
Hint
Tank and pipeline; pond and rainwater harvesting; trees.
Answer
(a) Safe water supply: the capacity of the overhead water tank was enhanced and a 900 m extra pipeline was laid to supply potable water. (b) Groundwater recharge and dilution: the silted pond was desilted and recharged, which recharged the aquifers, and rainwater harvesting structures helped dilute the contaminants of the groundwater after the monsoons. (c) Ecological improvement: 1,000 trees were planted, which improved the environment. The grouping into these three headings is ours; the steps are NCERT's.
Q5 · 2 marks · Very short answerBoard level
Name any four diseases that, according to NCERT, are carried by the flies and rodents that live on solid waste. (2 marks)
Hint
Typhoid and cholera are two of them.
Answer
Any four of typhoid, diphtheria, diarrhoea, malaria and cholera.
Q6 · 3 marks · Short answerHOTS / competency
A student writes: "Half of all urban solid waste in India is left uncollected." Use the NCERT figures to explain why this is an overgeneralisation. (3 marks)
Hint
Who has 90 per cent collected and who has 30 to 50 per cent uncollected?
Answer
NCERT gives two different figures: in metropolitan cities like Mumbai, Kolkata, Chennai and Bengaluru about 90 per cent of the solid waste is collected, so only about 10 per cent (our subtraction) is not; in most other cities and towns 30 to 50 per cent is left uncollected. So half is the upper end for most other towns, not a figure for all urban India, and NCERT gives no national total or the share of waste in each group, so no overall share can be derived from it.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.What are the two sources of solid waste?Show answer
Household or domestic establishments, and industrial or commercial establishments.
2.Where are industrial solid wastes disposed of?Show answer
At low-lying public grounds (landfill areas), through public (municipal) facilities.
3.Which gas does untreated waste release, according to NCERT?Show answer
Toxic biogas, including methane.
4.Which four metropolitan cities does NCERT name for 90 per cent collection?Show answer
Mumbai, Kolkata, Chennai and Bengaluru.
5.What contaminated the groundwater of Daurala?Show answer
Heavy metals, from untreated waste water of Daurala industries leaching into the groundwater table.

Urban Waste Disposal: frequently asked questions

How have solid waste and Daurala appeared in board papers?

Daurala as a source-based item (2023 64/3/1 Q19: meaning of water pollution, the role of the industrialists and the NGO); an example of solid waste as an MCQ (2024 64/3/1 Q13); the problem of urban waste disposal with measures as 3-mark and 5-mark answers (2024 64/1/2 Q23; 2025 64/4/1 Q28(a); 2026 64/4/3 Q24); and solid waste in the sample papers (2024-25 Q28(A) on its significance and Q28(B) on reasons for its increase and two strategies at source; 2026-27 Q26(A) on turning urban waste into resources). The questions on this page are framed to avoid repeating these.

Does NCERT list strategies to cut waste at source?

No. NCERT says wastes should be treated as a resource and used to generate energy and compost, but it does not list source-reduction strategies. A question such as the sample paper 2024-25 Q28(B) needs points beyond the textbook text, which should be marked as general knowledge.

Are rural-urban migration and slums part of this page?

No. The syllabus lists them separately in Chapter 9, and they are covered on the chapter page. This page covers only urban waste disposal and the Daurala case.

Is there a map item?

No. The 2026-27 syllabus map list shows Nil for Chapter 9.