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Environmental Impact Assessment in India

Table of Contents​

  1. Introduction
  2. What is Environmental Impact Assessment?
  3. Legal Framework
  4. The EIA Notification, 2006 — Categorisation of Projects
  5. Regulatory Authorities
  6. Stages of the EIA / Environmental Clearance Process
  7. Public Consultation and Public Hearings
  8. Key Principles Underpinning EIA
  9. Case Law
  10. Practical Applications and Illustrations
  11. Contemporary Developments and Criticisms
  12. Learning Aids (Key Terms, Exam Tips, Practice Questions)
  13. Conclusion

Introduction​

Environmental Impact Assessment (EIA) is one of the central tools of preventive environmental regulation in India. It is a process by which the likely environmental effects of a proposed project or activity are studied, predicted and evaluated before the project is approved and construction begins. The core idea is precautionary: it is cheaper, safer and more effective to anticipate and avoid environmental harm than to try to repair it afterwards.

EIA links the goals of development and environmental protection. A large dam, a mine, a highway, a thermal power plant or a chemical factory can bring economic benefits but may also damage forests, pollute air and water, displace communities and destroy biodiversity. EIA requires a project proponent to identify these consequences, propose measures to reduce them, and place the assessment before regulators and the public before a decision is taken.

What is Environmental Impact Assessment?​

EIA can be understood as a systematic examination of the environmental consequences of a project. It typically covers:

  • Physical impacts — on air quality, water bodies, soil, noise levels and land use;
  • Ecological impacts — on forests, wildlife, biodiversity and ecologically sensitive areas;
  • Social impacts — on nearby communities, livelihoods, health and displacement;
  • Cumulative and long-term impacts — effects that build up over time or combine with other projects in the region.

The written output of this study is the Environmental Impact Assessment Report (EIA Report) together with an Environment Management Plan (EMP), which sets out how the identified impacts will be avoided, minimised or mitigated and monitored.

The Environment (Protection) Act, 1986​

The statutory foundation of EIA in India is the Environment (Protection) Act, 1986 (EP Act), an umbrella legislation enacted in the aftermath of the Bhopal gas tragedy. Section 3 of the EP Act empowers the Central Government to take all measures necessary to protect and improve the quality of the environment, including laying down procedures and safeguards for activities that may cause environmental harm. It is under this broad power that the requirement of prior environmental clearance is imposed.

The Environment (Protection) Rules, 1986, framed under the Act, provide the procedural machinery, including the power to issue notifications restricting the location or operation of industries and processes in certain areas.

The EIA Notification​

The prior-clearance requirement is not spelt out in the Act itself but in a notification issued under it. The first EIA Notification was issued in 1994, making environmental clearance mandatory for a listed set of projects. It was comprehensively revised and replaced by the EIA Notification, 2006, which remains the principal regulatory instrument governing the EIA process today. The 2006 Notification restructured the system by decentralising a large share of appraisal to the states and introducing a clearer categorisation of projects.

EIA does not operate in isolation. Depending on the project, other approvals may be required in parallel, notably:

  • The Forest (Conservation) Act, 1980, which requires prior approval of the Central Government before forest land is diverted for non-forest purposes such as mining, roads or dams.
  • The Wildlife (Protection) Act, 1972, where a project affects protected areas or wildlife corridors.
  • Consents under the Water (Prevention and Control of Pollution) Act, 1974 and the Air (Prevention and Control of Pollution) Act, 1981 from the Pollution Control Boards.

Exam tip: A common error is to say that EIA in India was created by a policy document such as the National Environment Policy, 2006. That is inaccurate. EIA is a statutory-backed regulatory requirement imposed through the EIA Notification (1994, replaced by 2006) issued under the Environment (Protection) Act, 1986. Policy documents describe intent; the legal obligation flows from the Act and the Notification.

The EIA Notification, 2006 — Categorisation of Projects​

A defining feature of the 2006 Notification is that it classifies projects requiring prior environmental clearance into two categories based on their potential impact and scale:

CategoryAppraised byDescription
Category ACentral level — MoEFCC, on the recommendation of the Expert Appraisal Committee (EAC)Large projects with potentially significant impacts; require a full EIA process
Category BState level — State Environment Impact Assessment Authority (SEIAA), on the recommendation of the State Expert Appraisal Committee (SEAC)Smaller projects, appraised by the state

Category B is further divided at the scoping stage:

  • Category B1 — projects that require a detailed EIA study and, generally, public consultation;
  • Category B2 — projects considered to have lesser impact, which may be exempted from a full EIA report.

The Schedule to the Notification lists the sectors and threshold sizes that determine whether a project falls in Category A or B — for example, mining, thermal power plants, river valley projects, industrial estates, building and construction, and various manufacturing industries.

Regulatory Authorities​

  • Ministry of Environment, Forest and Climate Change (MoEFCC) — the apex environmental regulator at the Union level; grants clearance for Category A projects.
  • Expert Appraisal Committee (EAC) — a committee of technical experts that appraises Category A projects and advises the MoEFCC.
  • State Environment Impact Assessment Authority (SEIAA) — constituted by the Central Government for each state; grants clearance for Category B projects.
  • State Expert Appraisal Committee (SEAC) — the state-level counterpart of the EAC that appraises Category B projects and advises the SEIAA.

Stages of the EIA / Environmental Clearance Process​

Under the 2006 Notification, obtaining prior Environmental Clearance (EC) for a new project generally moves through four principal stages:

  1. Screening — Applicable only to Category B projects, this determines whether a project requires a detailed EIA (Category B1) or not (Category B2), based on the nature, location and scale of the project. Category A projects always require a full EIA.

  2. Scoping — The EAC (for Category A) or SEAC (for Category B1) determines the detailed Terms of Reference (ToR) for the EIA study, identifying the environmental issues and the studies the proponent must carry out. Baseline data on existing air, water, soil, noise, flora and fauna is collected over this period.

  3. Public Consultation — The concerns of persons who are locally affected are ascertained, usually through a public hearing at the project site and by inviting written responses from stakeholders (discussed below). Certain project types are exempted.

  4. Appraisal — The EAC or SEAC scrutinises the final EIA Report, the Environment Management Plan and the outcome of the public consultation, and makes a recommendation to the regulatory authority (MoEFCC or SEIAA), which then either grants clearance with conditions or rejects the application.

After clearance, the proponent must comply with the conditions imposed and submit periodic compliance / monitoring reports; clearances can be revoked for violation.

Public Consultation and Public Hearings​

Public consultation is one of the most important democratic safeguards in the EIA process. It has two components:

  • A public hearing conducted at or near the site, allowing local residents and affected persons to voice concerns;
  • An invitation for written responses from other interested stakeholders.

The draft EIA Report and a summary in the local language must be made available in advance so that people can participate meaningfully. This reflects the principle that those who bear the environmental and social costs of a project have a right to be heard before it is approved. Some categories of projects — for instance certain expansions, or projects located in notified industrial estates — are exempted from public consultation under the Notification.

Key Principles Underpinning EIA​

Indian environmental jurisprudence, developed largely by the Supreme Court and the National Green Tribunal, has read several principles into the EIA framework:

  • Precautionary Principle — where there are threats of serious or irreversible environmental damage, lack of full scientific certainty should not be used as a reason to postpone preventive measures. EIA is a practical expression of this principle.
  • Polluter Pays Principle — the cost of preventing and remedying environmental harm falls on the person who causes it.
  • Sustainable Development — development must meet present needs without compromising the ability of future generations to meet theirs; EIA is a mechanism to balance the two.
  • Public Trust Doctrine — natural resources are held by the State in trust for the public, reinforcing the need for transparency and participation.

Case Law​

Narmada Bachao Andolan v. Union of India (2000)​

Arising out of the Sardar Sarovar Project on the Narmada river, this well-known case addressed the tension between large development projects and the environmental and rehabilitation concerns of displaced communities. The majority permitted construction of the dam to continue in phases, subject to conditions relating to environmental safeguards and the rehabilitation of oustees being kept pace with the raising of the dam height. The case is frequently cited in discussions of how courts balance development against environmental and human costs.

Lafarge Umiam Mining Pvt. Ltd. v. Union of India (2011)​

The Supreme Court examined environmental and forest clearances granted for a limestone mining project in Meghalaya. The Court laid down important directions to improve the transparency, expertise and accountability of the environmental clearance and appraisal machinery, emphasising that regulatory decisions must be informed, reasoned and subject to expert scrutiny.

Hanuman Laxman Aroskar v. Union of India (2019)​

In this matter concerning the environmental clearance for the greenfield airport at Mopa, Goa, the Supreme Court underscored that EIA must be based on accurate and complete information. It found deficiencies in the disclosure of environmental data and directed corrective steps, reinforcing that clearances rest on the integrity and completeness of the underlying assessment.

Alembic Pharmaceuticals Ltd. v. Rohit Prajapati (2020)​

The Supreme Court held that the concept of ex post facto (retrospective) environmental clearance — that is, granting clearance to a project after it has already been built or begun operating — is fundamentally contrary to the precautionary principle and the scheme of environmental law, which is designed to prevent harm before it occurs. This is a leading authority against regularising illegal projects through belated clearances.

Note on case law: Students should read the full judgments before relying on any single sentence of summary. The holdings of environmental cases are often nuanced and fact-specific, and later decisions can qualify earlier ones.

Practical Applications and Illustrations​

Illustration 1 — A new thermal power plant. A company proposes a large coal-based thermal power plant. Because of its size, it falls in Category A and must undergo a full EIA appraised at the central level by the EAC. The company prepares an EIA Report predicting impacts on air quality, water use and ash disposal, proposes mitigation in its Environment Management Plan, and a public hearing is held for affected villages before the MoEFCC decides on clearance.

Illustration 2 — A mid-sized construction project. A real-estate developer plans a large township. Depending on its built-up area, it may fall in Category B. At the screening stage the SEAC decides whether it needs a detailed EIA (B1) or can be cleared on the basis of limited information (B2). Clearance is granted by the SEIAA of that state.

Illustration 3 — Starting work without clearance. A factory begins construction before obtaining environmental clearance and later applies for a "regularisation" clearance. Following the reasoning in Alembic Pharmaceuticals, such ex post facto clearance is impermissible, and the proponent may face closure directions and penalties.

Contemporary Developments and Criticisms​

The Government published a Draft EIA Notification, 2020, proposing to consolidate and amend the 2006 framework. It attracted significant public debate and criticism from environmental groups, who argued that some proposals — such as expanded exemptions and provisions perceived to enable post-facto clearances — could weaken environmental safeguards and public participation. Students should treat the 2020 draft as a proposal and check its current status, since the EIA Notification, 2006 remains the operative law unless and until it is formally replaced.

Recurring criticisms of the EIA regime in practice include: EIA reports prepared by consultants engaged by the proponent (raising concerns of bias), poorly attended or inadequately publicised public hearings, weak post-clearance monitoring, and the frequent regularisation of violations. The National Green Tribunal (NGT), established under the National Green Tribunal Act, 2010, has become an important forum for challenging environmental clearances and enforcing compliance.

Learning Aids​

Key Terms​

TermMeaning
EIA ReportThe document assessing the likely environmental effects of a project
Environment Management Plan (EMP)The plan to mitigate, manage and monitor identified impacts
Environmental Clearance (EC)The prior approval a project must obtain before commencing
Terms of Reference (ToR)The scope of studies fixed at the scoping stage
EAC / SEACExpert Appraisal Committee (central) / State Expert Appraisal Committee
SEIAAState Environment Impact Assessment Authority — grants Category B clearances
Category A / BCentral-level vs state-level appraisal categories under the 2006 Notification
Ex post facto clearanceRetrospective clearance after work has begun — held impermissible

Exam Tips​

  • Remember the four stages: Screening → Scoping → Public Consultation → Appraisal.
  • Be precise about the legal source: EP Act, 1986 → EIA Notification, 2006 (not a policy document).
  • Distinguish Category A (central/EAC/MoEFCC) from Category B (state/SEAC/SEIAA), and B1 (needs EIA) from B2.
  • Link EIA to the precautionary principle and sustainable development.

Practice Questions​

  1. What is Environmental Impact Assessment, and what is the statutory basis for the requirement of prior environmental clearance in India?
  2. Distinguish between Category A and Category B projects under the EIA Notification, 2006, and identify the authorities that appraise and clear each.
  3. Explain the four stages of the environmental clearance process. Why is public consultation important?
  4. "Ex post facto environmental clearance defeats the purpose of environmental law." Discuss with reference to relevant case law.
  5. Critically examine the criticisms levelled against the EIA regime in India and the role of the National Green Tribunal.

Conclusion​

Environmental Impact Assessment is the principal preventive mechanism through which Indian law seeks to reconcile economic development with environmental protection. Rooted in the Environment (Protection) Act, 1986 and operationalised through the EIA Notification, 2006, it requires that the environmental consequences of a project be studied, disclosed to the public and appraised by experts before approval is granted. For students, the essentials to master are the legal source of the requirement, the categorisation of projects, the four-stage process, the roles of the EAC, SEAC and SEIAA, the safeguard of public consultation, and the guiding principles of precaution and sustainable development. Because the field evolves through amendments, draft notifications and a steady stream of case law, accuracy and up-to-date reading of the primary materials are essential.

Additional Resources​

  • Ministry of Environment, Forest and Climate Change (MoEFCC) — official EIA and environmental clearance portal (PARIVESH)
  • Environment (Protection) Act, 1986 and Environment (Protection) Rules, 1986
  • EIA Notification, 2006 (as amended)
  • National Green Tribunal Act, 2010