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Tioga County well TI 470. The well is 73 feet deep, and lies in the Sand and Gravel Aquifers (glaciated regions.) The well is part of the Groundwater Quality Monitoring Network (GWMN) since 2014, and is one of 27 wells distributed over 26 counties in Pennsylvania. Wells are sampled twice a year. In a project other than the GWMN, water-level (depth below land surface) data collection began in September 1984.