Prince George's County housing officials are threatening to evict more than 100 families from three low-in-come apartment complexes, saying that tenants are endangered by soil erosion and the fact that some of the buildings are largely vacant.

The actions by the county Department of Licenses and Permits continue a campaign against substandard housing projects in Prince George's ordered by County Executive Lawrence J. Hogan. All three of the developments subject to the eviction orders are low-income projects subsidized or owned by the federal government.

County housing inspectors have ordered that the 94-unit Central Gardens complex in Seat Pleasant be vacated on Sept. 1 unless deep ruts and holes around buildings, caused by erosion, are repaired.

In addition, officials have told the managers of the 592-unit Glenarden Apartments in Glenarden and the 174-unit Gregory Estates apartments in Seat Pleasant that they must clear buildings that are less than 50 percent occupied on Sept. 1.

"We have been trying to get repairs made at these projects for a long time," said Charles C. Deegan, the deputy director of the Licenses and Permits department. "The problem is that the federal government isn't doing much of anything at any of these projects."

County officials halted new rentals at all three projects several months ago in an effort to force repairs, Deegan said.

Department of Housing and Urban Development officials supervising the projects could not be reached for comment yesterday.. But Deegan said that HUD had awarded a contract for repairs at Central Gardens, making the threatened evictions on Sept. 1 unlikely.

Deegan said that evacuation of buildings less than half occupied at the other projects would be carried out, however. "If a building is more than half empty, it's a health and safety hazard to the people who live there," he said.