Hurricane Katrina affected 1,223 water systems-EPA

WASHINGTON, Sept 5 (Reuters) - Some 1,223 drinking water systems in three states have been affected by Hurricane Katrina, and some systems need more fuel to run generators to stay operating, the Environmental Protection Agency said on Monday.

The agency has issued boil-water notices to many of the systems. Louisiana has 683 drinking water systems affected, with 468 in Mississippi and 72 in Alabama, according to the EPA.

Separately, the agency on Monday conducted more sampling of flood waters in New Orleans.

The agency also said it granted the U.S. Army Corps of Engineers a waiver from water discharge permits to help pump the hurricane flood waters from the city.