On Water

Real time water-quality data are now easily accessible online through the USGS WaterQualityWatch website.

Real-time water quality measurements are available at more than 1,300 sites across the United States in streams with watersheds as small as a few square miles to more than a million square miles in the Mississippi River. Measurements include streamflow, water temperature, specific conductance, pH, dissolved oxygen, and turbidity.

The public also uses the on-line data to decide whether conditions, such as water temperature or turbidity, are favorable for recreational activities such as fishing, boating or swimming. 

You can also visit the Ground-Water Watch site.