The Gwinnett County Board of Commissioners has urged Congress to explicitly designate Lake Lanier a public water supply and to authorize raising the lake level by 2 feet.

The Army Corps of Engineers has allowed Gwinnett to use the lake as a public water supply since 1973. But a 2009 U.S. District Court ruling found that use is not authorized under federal law.

Commissioners on Tuesday passed a resolution asking Congress to authorize the lake’s use for public water and recreation. It passed another resolution seeking to raise lake levels by 2 feet, which would increase the available water supply by 25 billion gallons.