Environmental Impact Assessment

Environmental Impact Assessment, or EIA, is a planning tool used to work out the environmental, social and economic effects of a project before a decision is taken to go ahead with it. As explained by the United Nations Environment Programme (UNEP), its purpose is to predict environmental impacts early in the planning and design of a project, to build strategies that reduce harm, to fit projects to the local environment, and to give decision makers a clear set of predictions and options.

In simple terms, an EIA is a study carried out at an early stage to estimate the likely environmental impact of a proposed project or activity, and to design ways to soften any damage. It weighs both the positive and the negative effects of a plan in a balanced way, so that environmental thinking is built into a project from the very start. The basic idea is to balance development with environmental sustainability.

Where EIA came from

Today EIA is one of the most successful policy interventions for environmental management, and more than 100 countries use it. Its beginnings can be traced to the early 1970s, after the National Environmental Policy Act (NEPA) of 1969 was passed in the United States. EIA spread to high income countries such as Canada, Australia and New Zealand during the 1970s and 1980s, and later to developing countries such as China and Brazil. The World Bank made EIA a requirement for funding major development projects in 1989, and environmental impact assessment was one of the principles written into the Rio Declaration of 1992.

EIA in India

EIA was made compulsory for certain kinds of development project in India in 1994, when an EIA notification was issued under the Environment (Protection) Act, 1986. It was later replaced by the 2006 EIA notification, which is still in use today. The Ministry of Environment, Forest and Climate Change (MoEFCC) is the nodal ministry for these notifications.

Governments carry out a cost benefit analysis for each project. This calls for a careful study of every technical and scientific question, as well as attention to the concerns of the local community. Since 1997, development projects have had to go through the environment clearance (EC) process, a four stage approval that includes appraisal and public input. Under the Environment (Protection) Act, 1986, the government decides which projects need clearance and can amend the rules by executive order.

The 2006 notification lists 59 categories of project and activity that require EIA. These fall into two groups, Category A and Category B. Category A, with 31 types of project, is appraised at the national level by the MoEFCC, while Category B, with 28 types of project, is appraised at the state level.

• To evaluate Category A projects, the Centre has seven Expert Appraisal Committees (EACs), while each state has one State Expert Appraisal Committee (SEAC).
• Category B projects are further separated into B1, which needs an environmental impact assessment, and B2, which does not. The SEAC decides whether a project is B1 or B2 based on its size, location, impact and ecological importance, using guidelines recommended by the MoEFCC.

The four steps of the EIA process

According to the EIA notification of 2006, the process in India has four main steps:

1. Screening
2. Scoping
3. Public consultation
4. Appraisal

Screening decides whether a project needs an EIA before it can be given environmental clearance. Every Category A project must complete an EIA before EC. For Category B, this screening step is carried out by the SEAC, which sorts projects into B1 and B2. These appraisal committees are multi disciplinary, sector specific groups made up of subject experts.

Scoping sets out the range of work the EIA must cover. It is done by the consultant together with the project proponent, and where needed with help from the Impact Assessment Agency. The MoEFCC has issued sector guidelines that explain the main issues an EIA study must address. Impacts that can be measured are judged by their size, spread, frequency and duration, while impacts that cannot be measured, such as aesthetic or recreational value, are studied using social and economic criteria. Once the areas that could be strongly affected are identified, their baseline condition is recorded, followed by the changes expected from the construction and running of the project.

Public consultation matters because local people are important stakeholders in any project. Their livelihoods may depend on the natural resources a project uses, or they may be harmed by the pollution it creates. The State Pollution Control Board (SPCB) or the Union Territory Pollution Control Committee (UTPCC) holds a public hearing, overseen by the district magistrate, to gather these concerns. The concerns are formally recorded, and the project proponent must respond to them. Environmental Management Plans (EMPs), which set out how different kinds of pollution will be reduced, are prepared as part of this stage and must be approved by a competent body such as the Quality Council of India or the National Accreditation Board for Education and Training (NABET).

Appraisal comes after the first three steps are complete. The EAC and SEAC study the reports and make a clear recommendation, to either grant or reject environmental clearance for Category A and B1 projects, with reasons. Appraisal is done within 60 days of the final EIA, after which the file moves to the decision making bodies.

At the national level the MoEFCC, for Category A, and at the state level the State Environmental Impact Assessment Authority, or SEIAA, for Category B1, are the nodal bodies that consider the reports from the EAC and SEAC and take the final decision. They can ask the committees to reconsider and resubmit a report, and it is finally up to these authorities to grant or deny approval.

After clearance, the next phase is monitoring compliance, which checks whether the project proponent is following the general and specific conditions of the EMP. The proponent must file six monthly compliance reports. State Pollution Control Boards, UT Pollution Control Committees and the regional offices of the MoEFCC are responsible for this monitoring.

At the district level, a District Expert Appraisal Committee (DEAC) evaluates EC applications for minor mineral licences, with the District EIA Authority acting as the nodal agency. This followed the 2006 notification as revised in 2016. However, a 2016 National Green Tribunal (NGT) order noted that district authorities lacked experience in granting leases for small scale and cluster mining, and that the MoEFCC had not put the necessary safeguards in place. In 2019 the NGT again directed that post implementation monitoring be strengthened, and the MoEFCC was asked to draw up an action plan for a proper monitoring mechanism.

Quarterly monitoring for post-EC compliance

Under later directions, the Central Pollution Control Board (CPCB) and the MoEFCC are to monitor 100 per cent of Category A projects, with data validation not to be outsourced to a third party, while for Category B projects data validation is done through the SEIAA.

To make the process faster and more proactive, the government has digitalised the grant and rejection of environmental clearances through PARIVESH (Pro Active and Responsive Facilitation by Interactive and Virtuous Environmental Single window Hub). PARIVESH was launched at the central level in August 2018 and at the state level in 2019 as a single window portal for environment, forest, wildlife and coastal clearances. It has made the process easier to track and has given the Digital India programme a boost.

How well has EIA worked in India?

EIA has both strengths and weaknesses. Turning the process into law puts India ahead of many developing countries that have struggled to build proper policy through legislation.

However, it has struggled on several other fronts. The early phases of an EIA often lack public involvement, and government agencies have only a limited role at the start. Early stages matter because they can speed up the process, support a strong review and help solve problems before they grow, as a Comptroller and Auditor General (CAG) audit pointed out in 2017.

According to that CAG study, environmental clearance was given within the fixed time limit of 105 days only 11 per cent of the time. In many industrialised countries, outside stakeholders such as NGOs are involved before the EIA begins, whereas in India screening is done from a pre defined list of activities.

The CAG audit also found that in some cases EIA reports were prepared by consultants who were not accredited, even when the rest of the process was followed. Both of these gaps weaken trust in the quality of EIA reports.

Public consultation is a key part of the EIA, but it has flaws too. There is no quorum requirement for public hearings, and most reports are written in English rather than in the local language, which makes it hard for local residents to take an informed view. Sometimes only the executive summary is translated. As a result, doubts hang over the whole process of public meetings and consultations.

A further problem is weak compliance after approval, for example around tree felling and extraction. SPCBs are widely seen as weak monitoring agencies, and there are calls to strengthen them. The central nodal agency has also been seen as lenient towards reported violations, with few fines and no proper database. In 2017 the MoEFCC granted a one time amnesty for all cases of violation, which ran until September 2018, and this led to controversy and, in some cases, long legal delays.

How the process could improve

Several ideas have been suggested to make EIA work better:

• Bring together permissions from different areas, such as coastal, environmental and forest, into a single streamlined process, so that long delays do not push people into cutting corners.
• Insist on high quality EIA reports, with the criteria properly followed.
• Move towards Strategic Environmental Assessment (SEA), which developed countries and bodies such as the OECD and the World Bank increasingly recommend. SEA builds environmental thinking into plans and programmes at an even earlier stage and tries to balance economic growth with sustainability.
• Make Expert Appraisal Committees accountable for their decisions, since at present they are not held responsible for making sure approved projects do not damage the environment.
• Give real weight to the recommendations of public hearings, so that people's views are treated as a priority.
• Strengthen the reach of the MoEFCC on the ground and empower SPCBs to investigate violations more thoroughly after clearance.

The Draft EIA 2020 debate

In 2020 the government proposed a new draft EIA notification, and many scientists, lawyers and citizens' groups criticised it strongly. A 2012 study by The Economics of Ecosystems and Biodiversity (TEEB) and UNEP estimated that natural ecosystems provide about 44 trillion dollars of services worldwide each year, yet these ecosystems can be extremely hard and costly to restore once badly damaged. The NGT has described the precautionary principle, preventing harm before it happens, as one of the core ideas of environmental justice.

Critics argued that the draft's provisions for post facto clearance would let companies break EIA rules first and seek approval later, which goes against the rule of law. This echoed a one time amnesty designed in 2017 for projects that had broken the 2006 rules.

They also warned that cutting compliance reports from twice a year to once a year looked like a step backwards, at a time when accidents such as the 2020 gas leak in Visakhapatnam and the oil field blowout in Baghjan, Assam, were in the news. Basing an EIA on a single season of data could make the study partial and misleading, hiding a project's full impact.

The draft also narrowed public participation, shortening the window for public comment from 30 days to 20 days and removing several projects from public hearings altogether. A broad new category of strategic considerations would not need hearings and could be used to bypass the public process. Complaints about a project's compliance could be filed only by the developer or the pollution control boards, leaving ordinary citizens out. Overall, critics said, the changes tilted power in environmental governance heavily towards the Union government and weakened the federal balance, including greater central control over appointments to the State Environmental Impact Assessment Authority.

Why it still matters

EIA is not just a topic in a textbook. It shapes real decisions about dams, highways, mines and factories that affect millions of people. The Draft EIA 2020 notification is a good example. After a huge volume of public feedback it was never finalised, and as of 2025 it remains only a draft, while the government keeps changing the 2006 rules through separate office memorandums.

The sharpest recent debate has been about post facto or retrospective clearance, the same idea criticised in the 2020 draft. On 16 May 2025, in Vanashakti versus Union of India, the Supreme Court struck down government orders that had allowed projects to get environmental clearance after they had already started, calling the idea of after the event clearance alien to Indian environmental law. Then, on 18 November 2025, a different bench recalled that ruling in a 2 to 1 decision, holding that retrospective clearances may be allowed in exceptional cases so that large public investments are not lost. One judge dissented, warning that this rewards those who break the rules. This back and forth shows how hard it is to balance development with environmental protection, which is exactly the job EIA is meant to do.

To see how this fits into the wider story of India's environment, economy and institutions, explore the essential background in the Learnacy Hub, browse more geography study notes, or return to the full library of study resources to revise related topics.

Sources

1. Supreme Court Observer, Vanashakti review: demoting the law to a suggestion
2. Drishti IAS, SC recalls verdict blocking retrospective environmental clearances
3. The Wire Science, the 2020 EIA notification remains a draft while the 2006 version is edited
4. Press Information Bureau, Government of India, clearance through the PARIVESH portal

Key takeaways

• EIA is a planning tool that predicts environmental, social and economic effects of a project before a decision is made, with the goal of building strategies to reduce harm and integrating environmental thinking from the start.
• EIA originated in the United States in the early 1970s after the National Environmental Policy Act (NEPA) of 1969 and spread to over 100 countries worldwide.
• In India, EIA became compulsory for certain development projects in 1994 under the Environment (Protection) Act, 1986, with the 2006 notification still in use today.
• Projects requiring EIA are divided into Category A (31 types, appraised at national level by MoEFCC) and Category B (28 types, appraised at state level), with Category B further split into B1 and B2.
• The four-step EIA process in India consists of Screening, Scoping, Public consultation, and Appraisal, with appraisal required within 60 days.

Test yourself

What are the four main steps of the EIA process in India according to the 2006 notification?

The four main steps are Screening, Scoping, Public consultation, and Appraisal.

How are Category A and Category B projects differentiated for EIA in India?

Category A projects (31 types) are appraised at the national level by the Ministry of Environment, Forest and Climate Change (MoEFCC), while Category B projects (28 types) are appraised at the state level.

What organization made EIA a requirement for funding major development projects in 1989?

The World Bank made EIA a requirement for funding major development projects in 1989.

Frequently asked questions

What is the primary purpose of an Environmental Impact Assessment (EIA)?

An EIA is a planning tool used to predict the environmental, social, and economic effects of a project before it is approved, aiming to reduce harm, fit projects to local environments, and integrate environmental thinking from the start.

How did the Environmental Impact Assessment originate?

EIA traces its origins to the early 1970s, following the U.S. National Environmental Policy Act (NEPA) of 1969, and later spread globally, including to developing countries like China and Brazil.

Which ministry in India oversees the EIA process, and what legal framework supports it?

The Ministry of Environment, Forest and Climate Change (MoEFCC) oversees EIA in India under the Environment (Protection) Act, 1986, which also allows the government to amend rules via executive orders.

What are the four main steps of the EIA process in India according to the 2006 notification?

The four steps are Screening, Scoping, Public consultation, and Appraisal. Screening determines if an EIA is needed, Scoping defines the assessment scope, Public consultation involves local input, and Appraisal evaluates the project for environmental clearance.