PITTSBURGH -- A study by the Associated Press found a variety of pharmaceuticals including antibiotics, anti-convulsants, mood stabilizers and sex hormones in the drinking water supplies of at least 41 million Americans.

Pittsburgh wasn't one of the cities tested, but local researchers have known for more than a year that estrogen is in some area rivers.

Dr. Dan Volz from the University of Pittsburgh is doing research on the effect of drugs like estrogen on fish.

Last year he showed Channel 11 fish he had caught near Kittaning.

Eighty-five percent of the fish Volz found were genderless.

Volz said it was the result of too much estrogen in the rivers.

He said the hormone gets into the water from cosmetics and cleaning products dumped down drains.

The chemicals are not completely filtered out in waste water treatment plants.

Myron Arnowitt, state director of Clean Water Action, said, "We know that there is a problem in Pittsburgh, we don't have direct water evidence, but the fish are showing us something is wrong." Dr. Stanley States is the water quality manager of the Pittsburgh Water and Sewer Authority, which serves 250,000 customers a day. States said, "Before people become alarmed at this, these are extremely low doses, much lower than in a prescription."

States said the treatment process at the water plant removes particles, microorganisms (delete comma) and bacteria.

Other local health officials said in the short term the tap water is safe. Guillermo Cole of the Allegheny County Health Department said, "The big question is do decades and decades of exposure to low levels pharmaceuticals in water supplies have any effect on human health?"

Water officials say they're taking their lead from the U.S. EPA, which hasn't required testing or set any guidelines.

States said, "The federal government is pursuing it. We're watching what they come up with, any guidance they come up, we'll abide by immediately."