CASPER, Wyo. (AP) — Water in the southeastern Wyoming town of Wheatland has tested higher than federal safety standards for uranium levels, but town officials say the water is still safe to drink.

Residents received letters Monday notifying them that uranium levels in the basin holding the town's drinking water had tested above safety standards. Officials say residents shouldn't be alarmed, but noted that infants, the elderly and pregnant women could be susceptible to increased risks.

Mayor Joe Fabian says the water from the basin is treated before it enters the town's water supply. He says tests conducted after the water had been treated found no dangerous levels of uranium.

Wheatland is working with the federal Environmental Protection Agency to identify the source of contamination.