Leesburg resident Kristen C. Umstattd, a Republican, has announced her intention to run next year for the 33rd District state Senate seat held for nearly two decades by Charles L. Waddell (D-Loudoun).

A lawyer who was an administrative assistant to Del. Linda M. Rollins (R-Loudoun) during the 1989 General Assembly session, Umstattd, 36, describes herself as a moderate Republican and a fiscal conservative.

Umstattd is not as well known as Waddell, who chairs the Senate Transportation Committee, and she said she is uncertain how much money she will raise for the contest. No other Republican has stepped forward to run for the four-year Senate seat, though the party's nominee will not be selected until next spring or summer.

Three years ago, Waddell had no opponent in the 33rd District, which includes all of Loudoun County plus a portion of Fairfax County around Dulles International Airport. The district, which includes many areas that have grown significantly in the past decade, will be redrawn early next year and may lose about 30 percent of its approximately 250,000 residents.

"We need to see greater responsiveness in government" to voters, said Umstattd, who stressed the need to preserve open space, ground water and other elements of the environment.

She opposes construction of the proposed Western Bypass, favoring additional public transportation. Umstattd said she may support state legislation limiting annual increases in real estate tax bills to 5 percent.