Eco-Sensitive Zone

The Eco-Sensitive Zone (ESZ) is a regulatory construct of Indian environmental law that creates a graded protective buffer around protected areas to act as a "shock absorber" against developmental pressure. Its statutory foundation lies in the Environment (Protection) Act, 1986, specifically Sections 3(2)(v) and 5, read with Rule 5(1) of the Environment (Protection) Rules, 1986, which empower the Union government to restrict the location of industries, operations, and processes in areas of ecological fragility. The conceptual genesis is the National Wildlife Action Plan (2002–2016), which urged that land within 10 kilometres of protected-area boundaries be notified as ecologically fragile. The Supreme Court reinforced this in Goa Foundation v. Union of India and, more consequentially, in its order of 4 December 2006 directing states to demarcate such zones, a directive periodically renewed in the T.N. Godavarman Thirumulpad forest-conservation proceedings.

The procedural mechanics follow a sequence administered by the Ministry of Environment, Forest and Climate Change (MoEFCC). A state government, through its forest department, prepares a proposal delineating the proposed ESZ boundary around a national park or wildlife sanctuary, accompanied by a Zonal Master Plan that maps land use, settlements, water bodies, and corridors. The proposal goes to the MoEFCC, which examines it and issues a draft notification inviting objections from the public within sixty days. After considering representations, the Ministry issues a final notification under Section 5 of the 1986 Act. Each notification establishes a Monitoring Committee, usually chaired by the District Collector or a senior forest officer, to oversee compliance and clear permissible activities.

Activities within an ESZ are sorted into three categories under the standard notification template: prohibited, regulated, and permitted. Commercial mining, stone quarrying, major polluting industries, commercial use of firewood, and establishment of new saw mills fall under prohibited. Regulated activities — felling of trees, establishment of hotels and resorts, erection of electric cables, widening of roads, and commercial water extraction — require prior permission and conformity with the Zonal Master Plan. Ongoing agriculture, horticulture, rainwater harvesting, and use of renewable energy are permitted. The notified width varies: while ten kilometres was the early reference, the operative default settled around one kilometre, with the actual extent calibrated to each protected area's ecology, ranging from a few hundred metres in urban-fringe sanctuaries to several kilometres where corridors demand it.

Named contemporary instances illustrate the friction the regime generates. The MoEFCC notified ESZs around the Sanjay Gandhi National Park in Mumbai and the Asola Bhatti Wildlife Sanctuary near Delhi. The Supreme Court's order of 3 June 2022 in In Re: T.N. Godavarman mandated a uniform minimum one-kilometre ESZ around every protected area nationwide and barred permanent structures within it — a ruling that provoked protests in Kerala, where dense human habitation abuts the Western Ghats sanctuaries, prompting the state to seek modification. On 26 April 2023 the Court partially relaxed that blanket directive, exempting existing residences and allowing flexibility where notifications were already in force, acknowledging the petitions filed by Kerala, Sikkim, and other states.

The ESZ must be distinguished from adjacent designations. It is not a Critical Wildlife Habitat, which is identified within a protected area's core under the Forest Rights Act, 2006, for inviolate conservation. Nor is it a Critically Polluted Area or an Ecologically Sensitive Area such as the Western Ghats, the latter recommended by the Gadgil and Kasturirangan committees as a region-scale designation independent of any single park boundary. The ESZ is also separate from a tiger reserve's buffer zone constituted under Section 38V of the Wildlife (Protection) Act, 1972, though the two may spatially overlap. The defining feature of an ESZ is that it is a peripheral buffer governed by the 1986 Act rather than core habitat governed by wildlife or forest statutes.

Several controversies persist. Many states delayed submitting ESZ proposals, leaving large swathes of protected-area peripheries unregulated for years, which the courts repeatedly censured. The 2022 blanket order exposed the tension between scientific buffering and the reality of pre-existing settlements, since a rigid one-kilometre rule would have rendered entire towns non-conforming. Critics argue the regulated-activity category invites discretionary clearance and rent-seeking by Monitoring Committees, while conservationists counter that lax enforcement, not the rules, is the failure. The 2023 relaxation, and subsequent state-specific notifications carving lesser widths, reflect an evolving balance between livelihood claims and ecological integrity. Linear infrastructure — highways and transmission lines crossing ESZs — remains a recurring flashpoint before the National Green Tribunal.

For the working practitioner — the environment desk officer, the policy researcher, the UPSC General Studies III aspirant — the ESZ is a case study in how India operationalises the precautionary principle through delegated legislation rather than fresh statute. It demonstrates the interplay of executive notification, judicial supervision, and federal negotiation that characterises Indian environmental governance. Understanding the ESZ requires holding three threads together: the 1986 Act's enabling power, the Supreme Court's continuing mandamus in the Godavarman case, and the state-level Zonal Master Plans that translate principle into parcel-by-parcel land use. It remains one of the most litigated and politically sensitive instruments in the conservation toolkit.