 Folks who live in Kennebunkport are still being urged to avoid swimming in the Kennebunk River. That's because the Maine Department of Environmental Protection says wastewater from a treatment plant in the community is not meeting quality limits. Initial results from environmental testing of water quality returned clean yesterday, removing any doubt regarding the safety of Laconia's drinking water after an oil spill into Paugus Bay. Testing was prompted after a corroded 330-gallon oil tank apparently leaked into a catch basin overnight at Meineke Car Care Center.