In Luzerne County, the percentage is far lower. That's because the Hazleton City Authority, which provided water to roughly 38,000 households in 1997, is the only public water supplier providing fluoridated water in the county. The company has 10 treatment facilities and 138,000 customers in the area, none of whom get fluoridated water. It will add fluoride to a given area only if all the municipalities served by that supply district request it, Corrado said. That's not likely to happen, because it would take a coordinated effort by several municipalities, Tigue said.
Most water districts cross town lines.