A boil-water order remains in effect for the Portland Peninsula after a break in a 20-inch water main that flooded a downtown street. About 4,000 homes and businesses are affected by the order. The Portland Water District says it collected a dozen water samples from around the peninsula and found no immediate indication of contamination. But officials said the samples were still being analyzed for the presence of bacteria and the test results will not be known until mid-morning Thursday at the earliest. The water main break Wednesday on Somerset Street, near Whole Foods, flooded the road with water that reached a depth that topped headlights of parked cars. Two elementary schools had to close for the day.