WASHINGTON— Dozens of U.S. troops in Iraq fell sick at bases using "unmonitored and potentially unsafe" water supplied by the military and a contractor once owned by Vice President Dick Cheney's former company, the Pentagon's internal watchdog says.

A report obtained by The Associated Press said soldiers experienced skin abscesses, cellulitis, skin infections, diarrhea and other illnesses after using discolored, smelly water for personal hygiene and laundry at five U.S. military sites in Iraq.

The Pentagon's inspector general found water quality problems between March 2004 and February 2006 at three sites run by contractor KBR Inc., and between January 2004 and December 2006 at two military-operated locations.

It was impossible to link the dirty water definitively to all the illnesses, according to the report. But it said KBR's water quality "was not maintained in accordance with field water sanitary standards" and the military-run sites "were not performing all required quality control tests."

"Therefore, water suppliers exposed U.S. forces to unmonitored and potentially unsafe water," the report said.

The problems did not extend to troops' drinking water, but rather to water used for washing, bathing, shaving and cleaning. Water used for hygiene and laundry must meet minimum safety standards under military regulations because of the potential for harmful exposure through the eyes, nose, mouth, cuts and wounds.

KBR said its water treatment "has met or exceeded all applicable military and contract standards." The company took exception to many of the inspector general's assertions. "KBR's commitment to the safety of all of its employees remains unwavering," the company said in a statement to the AP.

KBR is a former subsidiary of Halliburton Co., the oil services conglomerate that Cheney once led.