Project Final Report-DE-FC26-09NT0005680-The goal of this project is to help oil and gas operators increase production, decrease costs, and enhance environmental protection in the shale gas producing states of New York, Pennsylvania, West Virginia, Arkansas, Louisiana, Oklahoma, and Texas that encompass regions containing the Marcellus, Haynesville, Fayetteville, or Woodford shale formations. The objective is to create an internet-based water treatment technology catalog and decision tool that will pair an operator’s water treatment costs and capacity needs to optimal water treatment technologies. The catalog will identify produced water treatment options by region and water quality and quantity limits. The decision tool will help an operator choose from the best treatment options based on site specifics such as contaminants, desired resultant water quality, final use options, efficiency, and cost.