There are few studies of full-scale, outdoor, replicated, functioning pervious pavement systems. More studies of pervious pavement operating in its intended use (parking lot, roadway, etc.) during a range of climatic events, daily usage conditions, and maintenance regimes are necessary in order to properly evaluate these systems. In accordance with this research need, the EPA's Urban Watershed Management Branch has installed an instrumented, working full-scale 110-space pervious pavement parking lot in Edison, NJ. EPA plans to monitor several environmental stressors in effluent and runoff. This parking lot demonstration site investigates differences among side-by-side pervious asphalt, pervious concrete, and permeable interlocking concrete paver systems. The parking lot consists of three sets of parking rows, each one surfaced with a different pervious pavement type, and driving lanes surfaced with conventional asphalt. The pervious pavement parking areas contain replicated subsections to collect the infiltrating water as well as sections that allow the filtered effluent to infiltrate into the underlying soil. The replication allows for statistical analyses of collected data. Investigated parameters include: volume, temperature, solids, indicator organisms, nutrients, metals, and semi-volatile organic compounds.