Precautionary Principle, Polluter Pays, and the Bar on Ex Post Facto Environmental Clearance in India

This article is for educational and legal awareness purposes only. It does not constitute legal advice or solicitation. Please consult a qualified advocate for advice on specific legal matters.

Overview

Indian environmental law is not built on a single statute. It rests on a constitutional foundation — Article 21’s guarantee of life extended by the courts to include a pollution-free environment, and the Directive Principles and Fundamental Duties in Articles 48A and 51A(g) — combined with a cluster of central statutes: the Environment (Protection) Act, 1986; the Water (Prevention and Control of Pollution) Act, 1974; the Air (Prevention and Control of Pollution) Act, 1981; and the National Green Tribunal Act, 2010. Over three decades, the Supreme Court has read into this framework a set of doctrines that now function as binding law rather than aspiration: the precautionary principle, the polluter pays principle, and the overarching idea of sustainable development. More recently, the Court has used these doctrines to close a specific loophole — the practice of granting environmental clearance after a project has already been built or has started operating.

This article traces that doctrinal history through cases the courts have actually decided, and looks at how one of India’s longest-running environmental matters — a suo motu Public Interest Litigation on Ganga pollution before the Allahabad High Court — has applied the same principles to the sewage and tannery discharge problem in Uttar Pradesh.

The Statutory and Constitutional Framework

The Environment (Protection) Act, 1986 (EP Act) was enacted in the aftermath of the Bhopal gas tragedy as an umbrella law. Section 3 of the Act empowers the Central Government to “take all such measures as it deems necessary or expedient for the purpose of protecting and improving the quality of the environment,” and this is the statutory hook under which the Ministry of Environment, Forest and Climate Change (MoEF, earlier MoEF&CC) issues Environmental Impact Assessment (EIA) notifications — including the requirement of prior environmental clearance for specified categories of industrial and infrastructure projects.

Alongside the EP Act sit sector-specific statutes: the Water Act, 1974 for discharge into water bodies, the Air Act, 1981 for emissions, and the Forest (Conservation) Act, 1980 for diversion of forest land. The National Green Tribunal Act, 2010 created a specialised tribunal — the National Green Tribunal (NGT) — with jurisdiction, under Section 14, over “substantial questions relating to environment” arising out of the implementation of a specified list of these enactments, and with the power under Section 16 to hear appeals against orders and clearances granted under them.

None of these statutes, by their bare text, use the phrases “precautionary principle” or “polluter pays.” Those doctrines were developed by the Supreme Court and then read into the statutory scheme as binding legal principles.

The Precautionary Principle and Polluter Pays — Vellore Citizens Welfare Forum

The foundational case is Vellore Citizens Welfare Forum v. Union of India, decided by the Supreme Court on 28 August 1996 (1996 (5) SCC 647), arising from unregulated discharge of untreated effluent by tanneries in Tamil Nadu into agricultural land and the Palar river — a fact pattern with an obvious parallel to the Kanpur tanneries discussed later in this article.

Justice Kuldip Singh, writing for the Court, examined the international development of “sustainable development” as a concept — drawing on the Brundtland Report and subsequent international instruments — and identified the precautionary principle and the polluter pays principle as its two essential operative features. The Court held:

“The precautionary principle and the polluter pays principle have been accepted as part of the law of the land … we have no hesitation in holding that the precautionary principle and the polluter pays principle are part of the environmental law of the country.”

The Court went on to explain what the precautionary principle means in municipal law: environmental measures by the State and statutory authorities must anticipate, prevent, and attack the causes of environmental degradation; where there is a threat of serious and irreversible damage, the lack of full scientific certainty is not a reason to postpone preventive measures; and the burden of proving that a proposed action is environmentally benign lies on the developer or industry, not on the person objecting to it. On the polluter pays principle, the Court held that remediation of damaged environment is part of the process of sustainable development, and that the polluter must bear not only the cost of compensating individual victims but also the cost of reversing the ecological damage caused.

Significantly, the Vellore Citizens judgment itself relies on an earlier decision for the polluter pays principle — Indian Council for Enviro-Legal Action v. Union of India, decided by the Supreme Court on 13 February 1996 ((1996) 3 SCC 212). That case arose from the “Bichhri village” episode in Udaipur district, Rajasthan, where chemical industries manufacturing “H” acid discharged highly toxic untreated effluent that contaminated groundwater and agricultural land over a wide surrounding area. The Court held the polluting industries absolutely liable to compensate for the harm caused to the villagers and the environment, and to bear the cost of remedial measures, regardless of whether the harm was caused through a permitted process — squarely applying the “polluter pays” and “absolute liability” principles that Indian courts had begun developing in the wake of the Bhopal disaster.

Together, these two 1996 decisions established that in India, unlike in some jurisdictions, the precautionary principle and polluter pays are not merely policy guidance — they are principles a court will apply and enforce as part of the environmental law of the country.

Prior Clearance, Not After-the-Fact Regularisation — Alembic Pharmaceuticals

If Vellore Citizens and Indian Council for Enviro-Legal Action establish the doctrine, Alembic Pharmaceuticals Ltd. v. Rohit Prajapati, decided by the Supreme Court on 1 April 2020, shows the doctrine being used to strike down a specific administrative practice — the grant of environmental clearance after a project has already commenced operations, commonly called an “ex post facto” clearance.

The appeal arose out of industrial units at Ankleshwar, Gujarat, that had gone into production without obtaining environmental clearance under the EIA notification of 27 January 1994. A circular issued by the MoEF on 14 May 2002 had purported to allow such defaulting units a “last and final opportunity” to obtain clearance retrospectively, on payment of a graded contribution to an earmarked fund. The National Green Tribunal held this circular contrary to law and ordered revocation of the clearances and closure of units operating without valid consent; the industries appealed to the Supreme Court.

Writing for the Bench of Justices Ajay Rastogi and D.Y. Chandrachud, the Court upheld the NGT’s view and held:

“The concept of ex post facto clearance is fundamentally at odds with the EIA notification dated 27 January 1994 … environment law cannot countenance the notion of an ex post facto clearance. This would be contrary to both the precautionary principle as well as the need for sustainable development.”

The judgment is notable for two further reasons relevant to this article. First, it expressly ties the ex post facto clearance question back to the precautionary principle and sustainable development recognised in Vellore Citizens — confirming that these are not free-standing academic doctrines but operative tests the Court applies to specific administrative decisions. Second, the Court addressed the limits of the NGT’s own jurisdiction: while the NGT has wide power under the NGT Act, 2010 to adjudicate substantial questions relating to environment arising under the specified enactments, the Court’s reasoning in Alembic records that this does not amount to a general power of judicial review of subordinate legislation of the kind the High Courts exercise under Article 226 of the Constitution — a reminder that the NGT and the High Courts occupy distinct, not overlapping, constitutional space in environmental adjudication.

The Uttar Pradesh Angle — Ganga Pollution Before the Allahabad High Court

The same principles have been applied for nearly two decades in Uttar Pradesh through Re: Ganga Pollution v. State of U.P. and Others, a suo motu Public Interest Litigation (PIL No. 4003 of 2006) before the Allahabad High Court concerning the discharge of untreated sewage and industrial effluent into the river Ganga.

In its order dated 13 July 2010, a Division Bench of Justices Ashok Bhushan and Arun Tandon recorded that the total discharge of dirty water at Kanpur stood at 409 MLD (million litres per day), against a treatment capacity at the city’s Sewage Treatment Plants (STPs) of only 106 MLD — meaning roughly 303 MLD of untreated sewage was entering the river. The Bench rejected a State proposal that would have earmarked a newly built 36 MLD STP exclusively for tannery discharge while continuing to permit tanneries to reopen, holding that this was contrary to the State’s own earlier affidavits and directed immediate shifting of the tanneries, with the existing STP capacity continued to be used for sewage treatment as before. The order also directed the Chief Secretary of Uttar Pradesh to personally oversee the laying of sewer lines connecting to the new STP and to file an affidavit addressing the extent to which the State could lawfully draw water from the main stream of the Ganga for canal irrigation without rendering the river’s flow at Allahabad unfit even for bathing — framing the underlying legal issue as: can a natural resource like the Ganga be permitted to be destroyed for want of adequate flow, or degraded in quality by uncontrolled discharge?

The order traces its own lineage to an earlier direction of 23 January 2006 by a Division Bench of the same Court, underscoring that this is a long-running, continuously monitored PIL rather than a one-off judgment — a High Court exercising its Article 226 writ jurisdiction to hold the State and its pollution-control machinery to the precautionary and polluter-pays standards articulated by the Supreme Court, in the specific context of a river that runs through the length of Uttar Pradesh.

Reading the Doctrine Together

Three points follow from placing these decisions side by side.

First, the precautionary principle and polluter pays are not confined to Supreme Court PILs against distant industries — they operate wherever a court finds a threat of environmental harm and an identifiable polluter, from tanneries in Vellore and Ankleshwar to tanneries and municipal sewage at Kanpur.

Second, the ban on ex post facto environmental clearance recognised in Alembic Pharmaceuticals means that an industrial unit which commences construction or operation without first obtaining environmental clearance cannot cure that default merely by applying for, and later obtaining, clearance after the fact. Prior clearance is treated as a condition precedent, not a formality that can be completed retrospectively.

Third, the NGT and the High Courts perform different, complementary roles. The NGT’s jurisdiction under the NGT Act, 2010 is specialised and statute-bound, confined to substantial questions relating to environment arising under the enactments listed in the Act. The High Courts, exercising writ jurisdiction under Article 226, retain a broader supervisory role — illustrated by the Allahabad High Court’s continuing oversight, over many years, of the State’s compliance with its own pollution-control obligations in the Ganga PIL.

Practical Points

A project proponent should treat environmental clearance as a prior requirement, to be obtained before construction or operation begins — not a step that can be regularised later, given the Supreme Court’s rejection of “ex post facto” clearance in Alembic Pharmaceuticals.
The polluter pays principle means liability for environmental harm is not limited to compensating identifiable individual victims; it can extend to the cost of restoring the damaged environment itself, as in the Bichhri village case.
Complaints about industrial or municipal discharge into a water body in Uttar Pradesh may be relevant to the ongoing Ganga Pollution PIL before the Allahabad High Court, in addition to any complaint to the Uttar Pradesh Pollution Control Board.
The NGT is the specialised forum for substantial questions relating to environment arising under the specified environmental statutes; it is not a substitute for a High Court’s general writ jurisdiction under Article 226.

Takeaway

Indian courts have moved the precautionary principle, the polluter pays principle, and sustainable development from being aspirational international-law concepts to being, in the Supreme Court’s own words, “part of the environmental law of the country.” The most recent significant application of that doctrine — the rejection of ex post facto environmental clearance in Alembic Pharmaceuticals — closes a route that industries had historically used to regularise non-compliance after the fact. In Uttar Pradesh, the same doctrinal thread runs through the Allahabad High Court’s long-running Ganga Pollution PIL, which continues to hold State authorities accountable for sewage and industrial discharge into the river using the same underlying tests of precaution and accountability.

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