The rule in Rylands v. Fletcher was evolved in the year 1866 and it provides that a person who for his own purposes being on to his land and collects and keeps there anything likely to do mischief if it escapes must keep it at his peril and, if he falls to do so, is prima facie liable for the damage which is the natural consequence of its escape.
The liability under this rule is strict and it is no defence that the thing escaped without that person’s wilful act, default or neglect or even that he had no knowledge of its existence. This rule laid down a principle of liability that if a person who brings on to his land and collects and keeps there anything likely to do harm and such thing escapes and does damage to another, he is liable to compensate for the damage caused. Of course, this rule applies only to non-natural user of the land and it does not apply to things naturally on the land or where the escape is due to an act of God and an act of a stranger or the default of the person injured or where the thing which escapes is present by the consent of the person injured or in certain cases where there is statutory authority.
Considerable case law has developed in England as to what is natural and what is non-natural use of land and what are precisely the circumstances in which this rule may be displaced.
The application of the rule in India
The Indian Supreme court in M.C.Mehta v. Union of India denied to accept this rule absolutely. The court said that,
“it is not necessary for us to consider these decisions laying down the parameters of this rule because in a modern industrial society with highly developed scientific knowledge and technology where hazardous or inherently dangerous industries are necessary to carry out part of the developmental programme.
This rule evolved in the 19th Century at a time when all these developments of science and technology had not taken place cannot afford any guidance in evolving any standard of liability consistent with the constitutional norms and the needs of the present day economy and social structure.
We need not feel inhibited by this rule which was evolved in this context of a totally different kind of economy. Law has to grow in order to satisfy the needs of the fast changing society and keep abreast with the economic developments taking place in the country. As new situations arise the law has to be evolved in order to meet the challenge of such new situations. Law cannot afford to remain static. We have to evolve new principles and lay down new norms Which would adequately deal with the new problems which arise in a highly industrialised economy.
We cannot allow our judicial thinking to be constricted by reference to the law as it prevails in England or for the matter of that in any other foreign country. We no longer need the crutches of a foreign legal order. We are certainly prepared to receive light from whatever source it comes but we have to build up our own jurisprudence and we cannot countenance an argument that merely because the new law does not recognise the rule of strict and absolute liability in cases of hazardous or dangerous liability or the rule as laid down in Rylands v. Fletcher as is developed in England recognises certain limitations and responsibilities. We in India cannot hold our hands back and I venture to evolve a new. principle of liability which English courts have not done.
We have to develop our own law and if we find that it is necessary to construct a new principle of liability to deal with an unusual situation which has arisen and which is likely to arise in future on account of hazardous or inherently dangerous industries which are concomitant to an industrial economy, there is no reason why we should hesitate to evolve such principle of liability merely because it has not been so done in England.”
The Indian court hold on Ryland v. Fletcher rule
The court held that an enterprise which is engaged in a hazardous or inherently dangerous industry which poses a potential threat to the health and safety of the persons working in the factory and residing in the surrounding areas owes an absolute and non-delegable duty to the community to ensure that no harm results to anyone on account of hazardous or inherently dangerous nature of the activity which it has undertaken.
The enterprise must be held to be under an obligation to provide that the hazardous or inherently dangerous activity in which it is engaged must be conducted with the highest standards of safety and if any harm results on account of such activity, the enterprise must be absolutely liable to compensate for such harm and it should be no answer to the enterprise to say that it had taken all reasonable care and that the harm occurred without any negligence on its part.
Since the persons harmed on account of the hazardous or inherently dangerous activity carried on by the enterprise would not be in a position to isolate the process of operation from the hazardous preparation of substance or any other related element that caused the harm must be held strictly liable for causing such harm as a part of the social cost for carrying on the hazardous or inherently dangerous activity.
If the enterprise is permitted to carry on a hazardous or inherently dangerous activity for its profit, the law must presume that such permission is conditional on the enterprise absorbing the cost of any accident arising on account of such hazardous or inherently dangerous activity as an appropriate item of its over-heads. Such hazardous or inherently dangerous activity for private profit can be tolerated only on condition that the enter- prise engaged in such hazardous or inherently dangerous activity indemnifies all those who suffer on account of the carrying on of such hazardous or inherently dangerous activity regardless of whether it is carried on carefully or not.
This principle is also sustainable on the ground that the enterprise alone has the resource to discover and guard against hazards or dangers and to provide warning against potential hazards.
The court therefore held that where an enterprise is engaged in a hazardous or inherently dangerous activity and harm results to anyone on account of an accident in the operation of such hazardous or inherently dangerous activity resulting, for example, in escape of toxic gas the enterprise is strictly and absolutely liable to compensate all those who are affected by the accident and such liability is not subject to any of the exceptions which operate vis-a-vis the tortious principle of strict liability under the rule in Rylands v. Fletcher (supra).
M.C. Mehta and Anr vs Union Of India; 1987 AIR 1086, 1987 SCR (1) 819
 Vide Halsbury Laws of England, Vol. 45 para 1305
 M.C. Mehta And Anr vs Union Of India; 1987 AIR 1086, 1987 SCR (1) 819