Potomac Basin Water Quality Data Inventory

Interstate Commission on the Potomac River Basin

Five people standing in a stream looking at a net used for stream monitoring.Water quality managers, researchers, and decision-makers depend on available water quality data, but it can be a challenge just to find the data collected for a specific waterway. To this end, ICPRB staff members produced an inventory of available water quality data sources in the Potomac River basin that includes information on watershed characteristics such as land use, zoning, elevation, and precipitation to help explain water quality patterns seen in the data.

Data Inventory

The following products have been developed as part of the data inventory effort:

  • Project Report—provides a summary of the inventory, a description of data sources and how to obtain data, an identification of gaps in the inventory, and a discussion of next steps.
  • Mapping Interface—available to assist users in identifying monitoring locations of interest. The map displays water quality data monitoring locations that are currently included in the inventory. A pop-up window appears for each location by clicking on the monitoring point. The pop-up window includes key information about the monitoring effort including either contact information or a web link to access the data.
  • Water Quality Inventory Datasheet—users can download the datasheet to obtain more information about the data sources without downloading the data. Monitoring locations on the map are linked to the spreadsheet inventory via the Source_No field.*


Efforts are made by ICPRB to keep this information up-to-date. As water quality data inventory collection efforts in the basin are extensive, however, the information provided here is for informational purposes only and is not guaranteed to be complete or appropriate for any particular use.

Contact us with questions or to submit additional water quality data sources for inclusion in the inventory.

*The data used to create the Mapping Interface page is also provided in the Water Quality Inventory Datasheet workbook to allow users to perform spatial searches on the monitoring point data in their local GIS application. This data can be found in the “Map_Points_info” sheet of the workbook. The “lat” and “long” fields of this table should be used to plot the points in the GIS and the “ICPRB_No” field can be used to reference the data collection contained in the “Source_No” field of the Water Quality Inventory database contained in the “ICPRB_Metadata” sheet.