| Paper | GS Paper 3 |
| Word Limit | 150 words |
| Syllabus Topic | Environmental Pollution and Degradation |

Model Answer
Industries such as tanneries, chemicals, textiles and distilleries release untreated effluents into rivers. Examples include tanneries along the Ganga at Kanpur and toxic foam in the Yamuna at Delhi.
From effluent to clean river
Mitigation Measures
- Effluent Treatment Plants in large units; Common Effluent Treatment Plants (CETPs) for small units.
- Zero Liquid Discharge (ZLD): treat and reuse all water.
- Online Continuous Effluent Monitoring Systems (OCEMS) for highly polluting industries.
- Cleaner technology, e.g. chrome recovery in tanneries.
- Strict use of the polluter pays principle, upheld in Vellore Citizens Welfare Forum (1996).
Government Initiatives
- Water (Prevention and Control of Pollution) Act, 1974 and Environment (Protection) Act, 1986.
- Namami Gange (2014) and the National River Conservation Plan.
- Orders of the National Green Tribunal to close or penalise polluting units.
Conclusion
Strong monitoring, public reporting and industry responsibility can make rivers clean again, in line with SDG 6 (Clean Water and Sanitation).
Related PYQs
- What is oil pollution? What are its impact on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India? (2023)
- Not many years ago, river linking was a concept but it is becoming reality in the country. Discuss the advantages of river linking and its possible impact on the environment. (2017)
Also read: Sustainable growth vs needs of the poor (GS1 2025)
More Science & Tech, Environment and Disasters PYQ Model Answers
✍️ Wrote your own answer to this question?
Upload it and get it evaluated instantly, with examiner-style red-ink remarks and marks.
Upload your answer →Or join our free daily answer-writing group on Telegram
Practise every GS3 PYQ, theme-wise
GS3 Mains PYQ workbooks: Economy, Environment, S&T and Security (3 PDFs)
View the workbook →Dr. Gaurav J. Sontake
Mentoring UPSC aspirants since 2020 · 10,000+ students · Former answer evaluator, Vision IAS
Not sure if your strategy is working? Talk it through on a free first mentorship call.
📅 Book a free call on WhatsAppHelpline: 7827779142