• Click on map to identify visible hydrologic units.
  • Zoom in to see smaller units (e.g. 12 digit).
  • Zoom in to see more detail (e.g. jurisdiction boundaries).
  • Use choices below to search by address, XY (longitude and latitude) or by hydrologic unit name, code or number.

(search for Virginia addresses only)



Find Coordinate (WGS84):

Degrees Minutes Seconds
Latitude  
Longitude



hint: you can enter decimals in any of the fields (e.g. decimal degrees or decimal minutes)
12 digit Hydrologic Unit Search:

  • search by 12 digit code or partial code
  • search by VA Code (VAHU6)
  • search by part of Unit Name (e.g. York)
12 digit Code VA Code Unit Name