Prince George's County Executive Parris Glendening, who has made improvements to the county's buildings and transportation system the priorities of his second term, announced plans yesterday for a $2.04 billion, six-year construction program.

The 1989-94 program would touch every area of the county and calls for $222 million in water and sewer improvements, $25 million for a courthouse and jail in Hyattsville -- a project that is expected to bolster revitalization efforts there -- and $155 million for new and renovated school buildings and libraries.

Among $51 million in new projects in the plan, which is to be updated each year, are a $3 million fire station in Seat Pleasant, $5 million to replace the Croom Vocational Center, $785,000 in new park and recreation facilities and $7 million for new road projects, including $4 million to improve Pennsylvania Avenue.

The bulk of the spending plan -- about $1.3 billion in federal, state and county dollars -- would go toward road and mass transit construction, including $522 million from Congress for completion of the Metro Green Line to Greenbelt by 1993.

Improvements to the 1,775-mile county and state road network are considered crucial in the fast-growing county as congestion begins to be felt in the booming areas around Laurel, Greenbelt and Bowie in the north and Fort Washington and Oxon Hill in the south.

"Prince George's County is rapidly becoming the county in which people want to live and work," Glendening said. "We have learned elsewhere the cost of delay. We will not allow delay {in improvements} to provide hardships for our citizens."

The proposal will go to the County Council by the end of March.

Council member Richard J. Castaldi, who has been critical of many of Glendening's progrowth policies, praised the "broad-based" program for giving equal attention to road construction and mass transit.

"I hope we've learned from the mistakes in other areas of the region," Castaldi said.

"I have to give Parris high marks for trying to put the adequate public facilities there at the same time the growth is occurring."

The 1989-94 building plan, which includes a 7 percent increase, to $740 million, in the county's contributions, is an ambitious program. It is in marked contrast to the limited building programs from 1979 to 1984, when the county operated under a voter-imposed tax freeze known as TRIM.

It also reflects the rapid population and building boom that has taken place in the county in the last five years.

Even as the building program has grown, the ratio of the county's debt to the total amount of assessed property has dropped consistently since 1983, to 2.4 percent of total assessed value in the county in 1987.

"We've looked beyond the years of deterioration that occurred under TRIM," Glendening said. "Our county can afford to invest in a {building program} that will allow us to meet our citizens' needs."

Money for the building program will come from a combination of federal, state and local dollars, including a $120 million bond package approved by voters in 1986.

Budget officials said the county will likely ask voters to approve an additional $80 million in bonds in 1990.

Developer contribution now is estimated to make up 5.5 percent of the $740 million county-financed program, but could increase significantly in the 1990 fiscal year if the council approves Glendening's proposal to impose impact fees in the fastest growing areas of the county.