EPA Water Quality Data

The Water Quality Portal is the nation's largest source for water quality monitoring data. The Water Quality Portal (WQP) uses the Water Quality Exchange (WQX) data format to share over 340 million water quality data records data from 400 federal, state, tribal and other partners.

Data and Resources

Additional Info

Field Value
Last Updated May 26, 2020, 15:17 (MDT)
Created April 16, 2020, 10:25 (MDT)
Update Interval
Data Owner Organization EPA
Data Owner Contact Name EPA
Data Owner Contact Email wqx@epa.gov