In older cities like Milwaukee, lead pipes are a potential threat. But there are different problems in rural areas. Ulao Creek is a tiny stream tucked into a quiet neighborhood in Mequon. On a recent afternoon, the water was high due to heavy rains the night before. And members of environmental group Milwaukee Riverkeeper are testing the water. » See More Project Milwaukee: Great Lakes, Troubled Waters Reports Using a plastic bottle mounted to a pole, Paul Lindquist stands on a bridge and scoops