New England
(01)
Missouri
(10)
California
Mid-Atlantic
(02)
South Atlantic-Gulf
(03)
Caribbean
(includes
V
irgin Islands)
(21)
Great Lakes
(04)
Ohio
(05)
T
ennessee
(06)
Upper
Mississippi
(07)
Souris-Red-Rainy
(09)
Lower Mississippi
(08)
T
exas-Gulf
(12)
Arkansas-White-Red
(11)
Pacific Northwest
(17)
Rio Grande
(13)
Upper
Colorado
(14)
Lower
Colorado
(15)
(18)
Great Basin
(16)
Alaska
(19)
Hawaii
(20)
Water-resources region and
region number (in parentheses)
EXPLANATION
Hawaii
(20)