| ARTESIA IRRIGATION DISTRICT NO. 8 |
| ATTALIA IRRIGATION DISTRICT NO. 1 |
| BLALOCK IRRIGATION DISTRICT NO. 3 |
| BLALOCK ORCHARDS IRRIGATION DISTRICT NO. 12 |
| BRADEN IRRIGATION DISTRICT NO. 20 |
| BURBANK IRRIGATION DISTRICT NO. 4 |
| CONSOLIDATED IRRIGATION DISTRICT NO. 14 |
| EAST SIDE IRRIGATION DISTRICT NO. 6 |
| GARDENA FARMS DISTRICT NO. 13 |
| GREEN TANK IRRIGATION DISTRICT NO. 11 |
| HUDSON BAY IRRIGATION DISTRICT NO. |
| HYDRO-IRRIGATION DISTRICT NO. 9 |
| ICE HARBOR IRRIGATION DISTRICT NO. 17 |
| IRRIGATION DISTRICT NO. 2 |
| MUD CREEK IRRIGATION DISTRICT NO. 7 |
| ORCHARD IRRIGATION DISTRICT NO. 10 |
| SOUTH COLUMBIA BASIN IRRIGATION DISTRICT |
| TOUCHET IRRIGATION DISTRICT NO. 16 |
| TWO RIVERS IRRIGATION DISTRICT NO. 19 |
| WALLA WALLA WATER & POWER DISTRICT NO. 18 |
| WATER DISTRIBUTION DISTRICT NO. 1 |
| WEST SIDE IRRIGATION DISTRICT NO. 5 |
| Carnhope Irrigation District #7 |
| Consolidated Irrigation District #19 |
| Hutchinson Irrigation District #16 |
| Moab Irrigation District #20 |
| Model Irrigation District #18 |
| North Spokane Irrigation #8 |
| Orchard Avenue Irrigation District #6 |
| Pasadena Park Irrigation District #17 |
| Trentwood Irrigation District #3 |
| Vera Irrigation District #15 |