UPSC Notes

Wastewater Treatment and Reuse

PYQs

10

Articles

2

Momentum

30

Phase IFoundation

Background

Overview

This concept addresses critical issues of water scarcity, sustainable urban development, environmental conservation, and resource management in India. It involves policy formulation, infrastructure development, inter-state cooperation, and public awareness, making it highly relevant across multiple GS papers for understanding India's environmental and developmental challenges.

Wastewater treatment involves removing contaminants from sewage and industrial effluents to produce an effluent suitable for discharge or reuse. Wastewater reuse, particularly of treated municipal wastewater, is an increasingly vital strategy for augmenting water supplies, reducing pollution, and promoting a circular economy in water-stressed regions.

Phase IIStatic core

Facts & tables

Key facts

Policy Mandate

BWSSB mandated the use of treated water for non-potable purposes in Bengaluru.

Economic Aspect

Treated water is sold at a nominal cost (₹10 per kilolitre) to encourage adoption.

Adoption Barriers

Challenges in adoption by smaller construction projects and public resistance for uses like swimming pools.

Decentralized Reuse

Efforts to map proximate users for surplus treated water from apartment Sewage Treatment Plants (STPs).

Resource Potential

Treated wastewater offers a reliable, drought-proof water supply, reducing dependence on freshwater sources and groundwater extraction.

Economic & Environmental Benefits

It contributes to climate resilience, drought-proofing cities, and supports low-carbon urban development by converting a waste product into a valuable resource.

Policy Framework

The National Framework on Safe Reuse of Treated Water (SRTW), 2022, mandates states to develop their own reuse policies, acknowledging the need for local solutions within a national vision.

Implementation Challenges

Requires institutional coordination, clear quality standards, economic incentives, and public acceptance to overcome misconceptions and ensure successful implementation.

Reference table

Static syllabus anchors

TypeReference
Conceptual areaWaste Management & Water Pollution
Conceptual areaEnvironmental Law & Policy
Conceptual areaWelfare Schemes & Social Policies

Reference table

Institutions & roles

BodyRole
Bangalore Water Supply and Sewerage Board (BWSSB)Regulates, promotes, supplies
Confederation of Real Estate Developers’ Associations of India (CREDAI)Advocates for industry adoption
Ministry of Jal ShaktiFormulates national policies and frameworks for water management, including wastewater reuse.
Urban Local Bodies (ULBs)Responsible for implementing wastewater treatment and reuse projects at the city level.
Atal Mission for Rejuvenation and Urban Transformation (AMRUT)Funds and scales sewage treatment infrastructure, a prerequisite for effective wastewater reuse.
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Statement-based questions

Prelims angle: Conceptual understanding

Quick revision

  • Treated water reuse augments urban water supply.
  • STPs are central to wastewater treatment infrastructure.
  • Policy mandates (e.g., for construction, pools) drive adoption.
  • Public perception and cost are key barriers.
  • Integration into building codes (National Building Code) is advocated.

High-confidence PYQs

Topic timeline

Waste Management & Water PollutionEnvironmental Law & PolicyWelfare Schemes & Social Policies

Bengaluru: Treated water sales up, but not yet at summer levels 

06 Aug 2026 · Wastewater treatment and reuse are critical for urban water security, involving STPs and policy mandates, but face hurdles in public acceptance and widespread implementation.

Read article

Adopt policies for reuse of treated water

31 Aug 2026 · Treated wastewater reuse is a strategic imperative for India to combat water scarcity, enhance climate resilience, and support sustainable growth by converting a waste product into a valuable resource through policy, infrastructure, and public engagement.

Read article

Related topics

Practice writing on this topic

UPSC has asked 10 linked questions on Wastewater Treatment and Reuse in Mains. Write an answer to one — and get it evaluated.

UPSC Prelims PYQs on Wastewater Treatment and Reuse

Practice official previous year questions asked by UPSC related to this concept.

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements: 1. Biofilters provide waste treatment by r...

2023·Environment & Ecology
Solve

With reference to bio-toilets used by the Indian Railways, consider the following statements: 1. The decomposition of human waste in the bio-toilets is init...

2015·Environment & Ecology
Solve

What can be the impact of excessive/inappropriate use of nitrogenous fertilizers in agriculture? 1. The proliferation of nitrogen-fixing microorganisms in t...

2015·Environment & Ecology
Solve

Which of the following can be found as pollutants in the drinking water in some parts of India? 1. Arsenic 2. Sorbitol 3. Fluoride 4. Formaldehyde 5. Uranium...

2013·Environment & Ecology
Solve

Consider the following materials: 1. Agricultural residues 2. Corn grain 3. Wastewater treatment sludge 4. Wood mill waste Which of the above can be used a...

2024·Environment & Ecology
Solve

With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct? 1. Fly ash can be used in the ...

2015·Environment & Ecology
Solve

Which of the following are the key features of ‘National Ganga River Basin Authority (NGRBA)’? 1. The river basin is the unit of planning and management. 2...

2016·Environment & Ecology
Solve

With reference to perfluoroalkyl and polyfluoroalkyl substances (PFAS) that are used in making many consumer products, consider the following statements : 1...

2024·Environment & Ecology
Solve

Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 1. Decreased salinity in the river 2. Pollution of groundwater ...

2018·Environment & Ecology
Solve

Which one among the following industries is the maximum consumer of water in India?

2013·Environment & Ecology
Solve

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