Hydrology

Hydrography data from the NHD are offered in Esri File Geodatabase 10.1 or Shapefile formats.
Your water might be affected by iron, a commonly occurring constituent of drinking water. Iron tends to add a rusty, reddish brown (or sometimes yellow) color to water, and leaves particles of the same color.
The USGS is a science bureau within the United States Department of the Interior.
Original hydrographic data were compiled to meet National Map Accuracy standards. These standards have been maintained in the process of creating the NHD.
The USGS Water Science for Schools Web site has a link to 'Water Science Glossary of Terms'.
The USGS Education website is your gateway to classroom resources.
Water leaving our homes generally goes either into a septic tank in the back yard where it evaporates or seeps back into the ground, or is sent to a sewage-treatment plant through a sewer system.
For general inquiries, call 1-888-ASK-USGS (1-888-275-8747) or use the online form.
There are USGS offices in each state. The USGS Headquarters office is located in Reston, Virginia.     
The USGS provides data on many different science topics. Most of it can be downloaded for free from our websites.