Consent to Establish and Consent to Operate

Consent to Establish (CTE) and Consent to Operate (CTO) are statutory permissions that an industrial unit in India must obtain from the relevant State Pollution Control Board (SPCB) — or, in Union Territories, the Pollution Control Committee — before it may lawfully set up and subsequently run its operations. Their legal foundation rests on two enactments: Section 25 of the Water (Prevention and Control of Pollution) Act, 1974, which forbids any person from establishing or taking steps to establish any industry, operation or process likely to discharge sewage or trade effluent without prior board consent; and Section 21 of the Air (Prevention and Control of Pollution) Act, 1981, which imposes an identical bar within designated air pollution control areas. The Water Act was passed under Article 252 of the Constitution after several states consented, while the Air Act draws on India's commitment at the 1972 Stockholm Conference. Together these two consents are colloquially termed the "consent mechanism," and they are administered by the SPCBs created under Section 4 of the Water Act, with the Central Pollution Control Board (CPCB) supplying coordinating directions under Section 16.

The mechanics proceed in two temporally distinct stages. An entrepreneur first applies for the CTE — sometimes called Consent for Establishment or NOC — before any civil construction begins. The application, now filed largely through online single-window portals, specifies the proposed location, the products and capacity, the manufacturing process, the quantum and quality of likely effluent and emissions, and the pollution control equipment proposed, such as effluent treatment plants, scrubbers or electrostatic precipitators. The board evaluates the site against the prescribed siting criteria, the assimilative capacity of the receiving environment, and the applicable industry category. On satisfaction it issues the CTE with stipulated conditions; this consent authorises construction and installation but not production.

The second stage is the CTO, applied for after the plant is built and pollution control systems are installed but before commercial production commences. Here the board verifies, frequently through a site inspection, that the abatement equipment has actually been erected as promised and that the unit can meet the discharge and emission standards notified under the Environment (Protection) Rules, 1986. The CTO is granted for a fixed validity period — typically tied to the industry's Red, Orange, Green or White categorisation under the CPCB's 2016 re-categorisation framework, with Red-category units granted shorter validity and White-category units largely exempted from CTO. Renewal must be sought before expiry, and consent fees are levied as a function of capital investment. Both consents carry binding conditions whose breach can trigger directions under Section 33A of the Water Act and Section 31A of the Air Act, including closure and disconnection of utilities.

Contemporary practice has shifted decisively toward automation. The Telangana State Pollution Control Board and several others operate combined consent applications that bundle CTE, CTO and Hazardous Waste authorisation, while the Maharashtra Pollution Control Board in Mumbai processes consents through its online MPCB portal. Following the 2020–2021 ease-of-doing-business reforms, many states adopted self-certification and deemed-approval timelines for White and Green units. The CPCB's 2016 directions standardised the colour categorisation across all SPCBs, assigning a Pollution Index score to each of the 60-plus industry sectors, which in turn fixes consent validity — up to fifteen years for Green industries in some states.

The consent mechanism must be distinguished from Environmental Clearance (EC), with which it is frequently conflated. EC is granted by the Union Ministry of Environment, Forest and Climate Change or by State Environment Impact Assessment Authorities under the EIA Notification of 2006, issued pursuant to the Environment (Protection) Act, 1986, and applies only to the project categories listed in that notification's schedule. CTE/CTO, by contrast, are state-board instruments under the Water and Air Acts and apply to a far broader universe of industries regardless of EIA listing. An EIA-listed project needs both an EC and the consents; a small foundry may need only the consents. The consents also differ from the Consolidated Consent and Authorisation issued by some boards merely as a procedural bundling, not a separate legal category.

Edge cases and controversies persist. The National Green Tribunal, established in 2010, has repeatedly penalised units operating without valid CTO and faulted SPCBs for mechanical renewals without inspection. Questions of whether a CTE lapses if construction is not commenced, whether expansion requires a fresh CTE, and how mining leases interact with the consent regime have generated litigation. The 2014–2017 push to ease compliance drew criticism that exemptions for White-category and certain Green units weakened oversight, while the persistent shortage of technical staff in many SPCBs undermines the inspection that the CTO stage presupposes.

For the working practitioner — whether advising investors, assessing a desk officer's compliance brief, or reporting on an industrial dispute — the CTE/CTO distinction is the practical hinge of Indian environmental regulation at the operational level. It is the point at which national pollution standards become enforceable against a specific factory, and its conditions, validity and renewal status are the first documents to examine when a unit faces closure, a community files a complaint, or a transaction's environmental due diligence is conducted.