Estimating that a nuclear war "could eliminate the population . . . of the metropolitan area," and dismissing the nation's civil defense program as a "pipe dream," Brentwood's mayor and Town Council last week called for an immediate nuclear arms freeze by the United States and the Soviet Union.

In a resolution that passed with little discussion, the council urged Congress to support the halt of nuclear arms deployment "by a verifiable, bilateral agreement" between American and Soviet officials.

The council also called for President Reagan and Soviet leaders to start arms reduction negotiations "at the earliest practical date," and to follow those with on-site inspections of each other's weapons systems, according to Town Clerk Mary Reed.

Brentwood officials added their town to a growing list of municipalities in the area and nationwide that are supporting a nuclear arms freeze. Similar resolutions recently have been approved in the towns of College Park, Garrett Park and Takoma Park and by the councils of Montgomery County and Loudoun County, Va.

The Brentwood resolution went beyond the others by denouncing survival tactics often associated with policies supporting nuclear strategy.

"The prospect of survival by the masses in civil defense shelters or evacuation is a pipe dream, to say the least," Brentwood's resolution stated.

In other business, the council introduced the 1982-83 budget of $305,089, which includes money for street and sidewalk maintenance, vehicle maintenance, trash collection and mosquito control.

Mayor George Denny proclaimed May 10-15 Municipal Clerk Week, and Reed was given a certificate for her service to the town since 1970.