List of water-resource regions:
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01  New England Region
02  Mid Atlantic Region
03  South Atlantic-Gulf Region
04  Great Lakes Region
05  Ohio Region
06  Tennessee Region
07  Upper Mississippi Region
08  Lower Mississippi Region
09  Souris-Red-Rainy Region
10  Missouri Region
11  Arkansas-White-Red Region
12  Texas-Gulf Region
13  Rio Grande Region
14  Upper Colorado Region
15  Lower Colorado Region
16  Great Basin Region
17  Pacific Northwest Region
18  California Region
19  Alaska Region
20  Hawaii Region
21  Caribbean Region