Clinton County, PA to Get New Marcellus Wastewater Plant Clinton County | Industrywide Issues | Pennsylvania | Wastewater November 9, 2012November 9, 2012 South Avis, in Clinton County, PA, will get a new Marcellus Shale wastewater treatment facility in about a year if all goes according to plan: Please Login to view this content. (Not a member? Join Today!) Related