Madras High Court to Hear Challenge to NGT’s 1-km Construction Ban Around Pallikaranai Marshland on August 3
The Madras High Court is set to hear on August 3 a batch of petitions challenging the National Green Tribunal’s (NGT) order that prohibits new construction approvals within a one-kilometre radius of the ecologically sensitive Pallikaranai Marshland, a Ramsar-recognised wetland in Chennai. The outcome is expected to have major implications for urban development, environmental conservation and thousands of landowners and developers in the city’s rapidly expanding southern suburbs.
The dispute stems from a September 2025 order of the NGT’s Southern Zone Bench directing authorities not to grant planning permissions within the marshland’s “zone of influence.” Acting on the Tribunal’s directions, the Chennai Metropolitan Development Authority (CMDA) suspended approvals for construction in the affected area, bringing several residential and commercial projects to a standstill.
The Confederation of Real Estate Developers’ Associations of India (CREDAI) has challenged the NGT’s order, arguing that the one-kilometre restriction was imposed without any statutory notification, scientific study or consultation with stakeholders. According to the developers, the blanket ban has frozen development across more than 8,000 acres spanning several villages, including major IT and residential corridors such as Sholinganallur, Perumbakkam and Karapakkam.
In a significant development ahead of the hearing, the Tamil Nadu State Wetland Authority (TNSWA) informed the High Court that there is no fixed one-kilometre buffer around the Pallikaranai Ramsar site. In an affidavit, the Authority clarified that the “zone of influence” cannot be uniformly applied and must instead be determined through a scientific assessment based on hydrology, topography, drainage patterns and surrounding land use, as contemplated under the Wetlands (Conservation and Management) Rules, 2017. It further stated that the one-kilometre zone shown in a draft Integrated Management Plan was merely indicative and not intended to operate as a statutory boundary.
Environmentalists, however, continue to support stringent protection of the marshland, warning that unchecked urbanisation has drastically reduced the wetland’s size over the past decades. They argue that the Pallikaranai Marsh plays a crucial role in flood mitigation, groundwater recharge and biodiversity conservation, and that unrestricted construction in its vicinity could aggravate flooding in Chennai while permanently damaging one of South India’s most important wetlands.
The August 3 hearing is expected to focus on whether the NGT was justified in imposing an interim one-kilometre restriction pending scientific delineation of the wetland’s zone of influence, or whether such a blanket prohibition exceeds the Tribunal’s powers. The High Court’s decision could shape the future of environmental regulation and urban planning around protected wetlands, while also providing clarity to developers, homebuyers and public authorities awaiting a definitive legal framework for the Pallikaranai region.
