Data Sources for Hydrology

The main national sources of hydrologic observation data are:

(1) USGS National Water Information System http://waterdata.usgs.gov/nwis

Streamflow, water quality, groundwater levels

(2) National Climate Data Center Climate Data Online http://cdo.ncdc.noaa.gov/CDO/cdo

Tutorial on how to use NCDC Site NCDCdata.doc

Precipitation, temperature

(3) EPA Storet http://www.epa.gov/STORET/

Water quality