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Pennsylvania's Long-Term Surface-Water Quality Network

January 23, 2025

USGS and PaDEP (Pennsylvania Department of Environmental Protection) have worked together for more than 20 years to sample and analyze water quality samples collected from streams around Pennsylvania. This geonarrative product contains a history of the project and shows where samples are collected from, what is analyzed in the samples, and where data collected by the project can be found. 

Map of Pennsylvania with triangle symbols colored blue, yellow, and orange at WQN locations

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