Eight Northern Virginia towns learned last week that Gov. Charles S. Robb has decided not to award Community Development Block Grants to any of them.

Officials of the state Department of Housing and Community Development said the only block grant money coming to northern Virginia next year will be funds for housing rehabilitation programs in Prince William County and Leesburg--grants awarded three years ago when the program was handled by the federal Department of Housing and Urban Development.

"The program is designed to benefit low- and moderate-income people," said Richard Burton, deputy director for Housing and Community Development in Virginia. "Many of the communities in Northern Virginia just aren't poor enough to qualify."

Round Hill, Lovettsville, Purcellville, and Middleburg sought money to upgrade water systems. Quantico and Loudoun County applied for money for housing rehabilitation programs. Manassas Park wanted funds to establish community parks and the City of Manassas asked for money to build a work facility for a group of handicapped residents.

Round Hill Mayor Jeffrey Wolford said "we have other plans up our sleeve," but wouldn't detail options the town may have for solving its water problems.

Middleburg's town administrator, Gerard Rogers, said his town would have to fund the necessary water system improvements itself.