These data are published in the peer-reviewed scientific journal Water Resources Research, with title "Contextualizing Inflow and Infiltration Within the Streamflow Regime of Urban Watersheds". A complete description of the data, its manipulation, and interpretation, are documented within that publication. The data include measurements of volumetric streamflow measured at 15-minute intervals on streams draining four watersheds in DeKalb County, GA. The original data were obtained by downloading from the United States Geologic Survey (USGS) online data base. The stream guage numeric identifiers assigned by the USGS are 02203873 (Cobbs Creek), 02203831 (Doolittle Creek), 02203960 (Lower Snapfinger Creek), and 02203863 (Shoal Creek). The data provided here are edited to remove redundant time increments and to add missing time increments. In the latter case, there was no addition of interpolated or otherwise estimated streamflow. We only added a row with date and time, where increments were missing, while leaving blank the associated column containing streamflow estimates. The data span from January 1, 2019 through December 31, 2019. The streamflow measurements were originally reported in cubic feet per second. Those units are retained in the files containing streamflow data that are made available here. The data also include measurements of wastewater flow within four sections of the sanitary sewer pipes draining from the same four watersheds. These data are derived from devices installed within the interior of the sanitary sewer pipes. These instruments and data are collected and administered by the DeKalb County (of Georgia) Department of Watershed Management, and were obtained by the authors of the publication noted above via an open-records request. The measurements are recorded at 15-minute intervals and span from January 1, 2019 through December 31, 2019. The original data were reported in gallons per minute. Those units are retained in the files provided here. The data also include measurements of precipitation recorded by two tipping bucket rain gauges. These data are also collected and administered by the DeKalb County Department of Watershed Management, and where obtained via open-records request. The measurements are recorded at 15-minute intervals. The original measurements were reported in inches of precipitation depth. Given the 15-minute recording interval, this can also be interpreted as a rate in units of inches per 15 minutes. Those units are retained in the files provided here.