A plan for voluntary water conservation is being considered by Round Hill officials because of a declining water level in the town reservoir.

The reservoir, designed to hold 10 million gallons of water, is 2 million gallons below capacity, said Mayor Jeffrey Wolford.

"Every day we are monitoring the town's water supply and it doesn't look like we are very far away from water conservation," Wolford said. "If we don't get a lot of rain soon, I intend to ask the council to take some action at our next meeting Oct. 7 ."

Wolford said Monday that he still is concerned about the low-water mark, despite recent rainy weather throughout the Washington area.

The 50-year-old Round Hill water system, plagued by leaks and deteriorating pipes, has troubled town leaders for the past decade. Six years ago the state health department ordered the town to improve the quality of the water, and town officials have searched for ways to finance a water treatment facility. Earlier this month, the Town Council voted to ask the state for aid to improve the water lines.

"Under voluntary conservation, we would ask folks not to unnecessarily use water for such things as washing cars and watering grass," Wolford said. "Last year we had voluntary conservation and it's getting to be a regular thing this time of year. If we don't have rain in late summer or early fall the reservoir level drops."

When the Round Hill Council meets next month, there will be a new council member, H. Rogers Thomas. Council member Michael Konopa has resigned for personal reasons and the council selected Thomas, a former member, to replace him. Thomas will serve the remainder of Konopa's term, which expires in June 1984.