Official Government Website

Administrative Basins

IDWR has divided the state into over 50 administrative basins in order to coordinate water management activities. Each basin is assigned to one of the four IDWR regions.

Northern Region: 03, 81, 82, 83, 84, 85, 86, 87, 91, 92, 93, 94, 95, 96, 97, 98

Western Region: 02, 03, 51, 55, 57, 61, 63, 65, 67, 69, 77, 78, 79

Southern Region: 01, 36, 37, 41, 43, 45, 47, 71, 72

Eastern Region: 01, 11, 13, 15, 17, 21, 22, 23, 24, 25, 27, 29, 31, 32, 33, 34, 35, 73, 74, 75

Administrative Basins, Regions, and Office Locations

Use the map below to find your administrative basin, region, and IDWR office.

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