USGS Water-Quality Information
USGS personnel collect a water-quality sample on the Missouri River. USGS/Photo by Kelly Brady.
Water Quality Data
Today's Water Conditions
Get continuous real-time water-quality measurements from Water-Quality Watch maps.
Water Quality Portal (WQP)
Get current and historical USGS and EPA water-quality data at the WQP.
Get stream ecosystem aquatic bioassessment data from BioData.
For More Data
USGS in Your Area
USGS Water Science Centers are located in each state.
Water-Quality Information -- Field Procedures