Explore wastewater and solid waste generated by oil and gas development in Pennsylvania by county, by well type, and by waste type. Hover over visualizations to see annual volumes or quantities and the number of wells responsible for generating waste. Wastewater is reported in barrels (bbl) and solid waste is reported in tons. Briefly, unconventional wells tap into unconventional source rock formations (e.g., the Marcellus shale) and employ extraction techniques such as high-volume hydraulic fracturing (e.g., fracking). Conventional wells produce from conventional formations, and may or may not use hydraulic fracturing to extract oil and gas.