On April 23, 1978, five brick buildings in Lowell and their contents were destroyed by fire. The fire started on the sixth floor of one of the buildings. Three of the buildings, including the one in which the fire started, had sprinkler systems. In this action, the owner of the premises sought recovery against the city of Lowell under G. L. c. 258 (1990 ed.), based on the claimed negligence of the city’s firefighters in combating the fire.
*140 The jury in a 1990 trial returned a verdict of $850,000 for the plaintiff. Because of the statutory limitation on the amount for which a municipality may be liable (see G. L. c. 258, § 2), a judgment for $100,000 was entered against the city. The city, which had moved unsuccessfully for a directed verdict, sought and obtained the entry of a judgment in its favor notwithstanding the verdict. The judge concluded that the city was exempt from liability under the discretionary function exception set forth in § 10 (b) of the Massachusetts Tort Claims Act, G. L. c. 258. We reverse the judgment for the city.
We are concerned solely with the question whether the city is entitled to immunity from liability by application of the discretionary function exception to governmental tort liability. The city does not argue that it owed no duty to the plaintiff or that the evidence did not warrant a finding that the city negligently violated that duty. We must, however, discuss the conduct on which liability was based, because it is that conduct that must have involved a discretionary function, within the very special meaning of those words in § 10 (b), if the city is to be immune from liability in this case.
The theory of the plaintiff’s case was that the city negligently failed to use the building’s sprinkler systems to fight the fire. The jury would have been warranted in finding the following facts. The sprinkler systems had been tested two days before the fire, and they worked satisfactorily. Water pressure adequate to allow the sprinkler system to work properly on the sixth floor of the building in which the fire started was not maintained during the fire. During the early stages of the fire, water was coming out of the sixth-floor sprinkler system. A pumper initially attached to the sprinkler system was disconnected shortly thereafter. The fire department hoses and the sprinkler system used the same water source, and use of the hoses reduced the pressure in the sprinkler systems. Accepted practice in fighting a fire high in a building of the type involved here required the use of the sprinkler system in the circumstances. It would be rare if a sprinkler system properly supplied with water pressure did *141 not put out such a fire, or at least contain it until it could be put out by manual means.
The first step in deciding whether a plaintiff’s claim is foreclosed by the discretionary function exception of § 10
(b)
is to determine whether the governmental actor had any discretion at all as to what course of conduct to follow. The United States Supreme Court has referred to this determination as the first of two parts of the discretionary function test under the Federal Tort Claims Act. See
Berkovitz
v.
United States,
The second and far more difficult step is to determine whether the discretion that the actor had is that kind of discretion for which § 10 (b) provides immunity from liability. Almost all conduct involves some discretion, if only concerning minor details. If allegedly tortious conduct were to be immunized from causing liability simply because there was some element of discretion in that conduct, the discretionary function exception would go a long way toward restoring the governmental immunity that G. L. c. 258 was designed to eliminate. As we shall show, however, the discretionary function exception, both under our Act and under the Federal Tort Claims Act (28 U.S.C. § 2680 (a) [1988]), is far narrower, providing immunity only for discretionary conduct that involves policy making or planning. Because of the limitation of the exception to conduct that is policy making or planning, the words “discretionary function” are somewhat misleading as a name of the concept.
This court’s principal analysis of the reason for a discretionary function exception to governmental liability appears in
Whitney
v.
Worcester,
In an anticipatory attempt to assist the process of differentiation between functions that are discretionary and those that are not, the court identified certain considerations as relevant. If the injury-producing conduct was an integral part of governmental policymaking or planning, if the imposition of liability might jeopardize the quality of the governmental process, or if the case could not be decided without usurping the power and responsibility of either the legislative or executive branch of government, governmental immunity would probably attach. Id. The general rule, however, should be one of governmental tort liability. Id.
The Federal Tort Claims Act and cases interpreting it underlie the discussion of the discretionary function exception in the
Whitney
opinion, and,.since 1978, we have treated de
*143
cisions under the Federal Act as providing some guidance in deciding the scope of § 10 (6)’s exception. See
Patrazza
v.
Commonwealth,
This court has declined to apply the discretionary function exception to a variety of governmental acts. A police officer deciding whether to remove from the roadways a motorist, known to be intoxicated, is not making a policy or planning judgment.
Irwin
v.
Ware,
*145
Cases involving alleged governmental negligence in fighting fires provide us with some help in deciding this case under the discretionary function test that we have established. In
Rayonier Inc.
v.
United States,
There are aspects of firefighting that can have an obvious planning or policy basis. The number and location of fire stations, the amount of equipment to purchase, the size of the fire department, the number and location of hydrants, and the quantity of the water supply involve policy considerations, especially the allocation of financial resources. In certain situations, firefighting involves determinations of what property to attempt to save because the resources available to combat a conflagration are or seem to be insufficient to save all threatened property. In such cases, policy determinations might be involved, and application of the discretionary function exception would be required.
The case before us is different. The negligent conduct, that caused the fire to engulf all the plaintiffs buildings was not *146 founded on planning or policy considerations. The question whether to put higher water pressure in the sprinkler systems involved no policy choice or planning decision. There was a dispute on the evidence whether it was negligent to fail to fight the fire through the buildings’ sprinkler systems. The firefighters may have thought that they had a discretionary choice whether to pour water on the buildings through hoses or to put water inside the buildings through their sprinkler systems. They certainly had discretion in the sense that no statute, regulation, or established municipal practice required the firefighters to use the sprinklers (or, for that matter, to use hoses exclusively). But whatever discretion they had was not based on a policy or planning judgment. The jury decided that, in exercising their discretion not to use the buildings’ sprinkler systems, the Lowell firefighters.were negligent because they failed to conform to generally accepted firefighting practices. When the firefighters exercised that discretion, policy and planning considerations were not involved. Therefore, the discretionary function exception does not shield the city from liability.
The judgment notwithstanding the verdict entered in favor of Lowell is vacated. Judgment shall be entered in favor of the plaintiff in the amount of $100,000. 3
So ordered.
Notes
Title 28 U.S.C. § 2680 (a), preserves governmental immunity for discretionary functions or duties in language that is duplicated in § 10 (b) of the Massachusetts Tort Claims Act. Both G. L. c. 258, § 10 (¿>), and 28 U.S.C. § 2680 (a) state an exception to governmental liability for any claim “based upon the exercise or performance or the failure to exercise or perform a discretionary function or duty on the part of’ the governmental employer or government employee.
In
Cady
v.
Plymouth-Carver Regional Sch. Dist.,
The judge ordered that, if the appeal were successful, interest on $100,000 would start running on May 22, 1990, the date of the jury verdiet. We have recently held that a postjudgment interest award is not proper on a judgment under G. L. c. 258. See
Onofrio
v.
Department of Mental
Health,
