| SPOKANE CITY OF | 343,167 | 1 | Detected |
| WHITWORTH WATER DISTRICT 2 | 26,883 | 434 | Detected |
| VERA WATER & POWER | 24,692 | 66 | Clean |
| CONSOLIDATED IRRIG DIST 19 SYSTEM 2 | 21,220 | 44 | Clean |
| SPO CO WATER DIST 3 SYS 1 | 18,983 | 124 | Detected |
| MODERN ELECTRIC WATER CO | 18,487 | 262 | Clean |
| EASTERN WASHINGTON UNIVERSITY | 17,108 | 39 | Detected |
| CHENEY CITY OF | 14,621 | 17 | Detected |
| LIBERTY LAKE SEWER & WATER DISTRICT | 14,212 | 27 | Detected |
| AIRWAY HEIGHTS CITY OF | 9,489 | 194 | Detected |
| CONSOLIDATED IRRIG DIST 19 SYSTEM 1 | 9,434 | 22 | Clean |
| MODEL IRRIGATION DIST #18 | 7,903 | 204 | Detected |
| PASADENA PARK IRR DIST 17 | 6,269 | 298 | Clean |
| SPO CO WATER DIST 3 SYS 4 | 6,155 | 332 | Clean |
| FAIRCHILD AIR FORCE BASE | 5,553 | 10 | Detected |
| DEER PARK CITY OF | 5,045 | 69 | Detected |
| SPOKANE BUSINESS & INDUSTRIAL PARK | 5,000 | 25 | Clean |
| MEDICAL LAKE CITY OF | 4,982 | 11 | Detected |
| ORCHARD AVENUE IRRIGATION DIST 6 | 4,330 | 24 | Clean |
| EAST SPOKANE WATER DIST 1 | 4,285 | 53 | Detected |
| TRENTWOOD IRRIGATION DISTRICT 3 | 4,228 | 45 | Detected |
| IRVIN WATER DISTRICT #6 | 4,150 | 11 | Detected |
| SPO CO WATER DIST 3 SYS 3 | 3,765 | 271 | Clean |
| Providence SHMC | 2,838 | 0 | — |
| HUTCHINSON IRRIGATION DIST #16 | 2,826 | 25 | — |
| North Spokane Irrigation District 8 | 2,214 | 73 | — |
| CARNHOPE IRRIGATION DISTRICT 7 | 2,104 | 7 | — |
| MILLWOOD CITY OF | 1,925 | 18 | — |
| MOAB IRRIGATION DIST #20 | 1,790 | 30 | — |
| RIVERSIDE SD CENTRAL SITE SCHOOLS | 1,320 | 225 | — |
| MOUNT SPOKANE SKI #2 | 1,301 | 9 | — |
| WHITWORTH UNIVERSITY | 1,200 | 151 | — |
| KAISER ALUM - TRENTWOOD WORKS | 954 | 12 | — |
| FREEMAN SCHOOL DIST #358 | 900 | 163 | — |
| HANGMAN HILLS WATER DIST 15 | 827 | 24 | — |
| WSDP Mt Spokane St Park #3 | 679 | 18 | — |
| WSDP Riverside SP ORV Area | 651 | 5 | — |
| FAIRFIELD TOWN OF | 643 | 166 | — |
| CLEAR LAKE REC AREA | 637 | 7 | — |
| RIDGE WATER ASSOCIATION | 615 | 11 | — |
| ROCKFORD TOWN OF | 570 | 79 | — |
| CONSOLIDATED SUPPORT SERVICES | 569 | 64 | Detected |
| STEVENS CO PUD - SPOKANE LAKE PARK | 532 | 9 | — |
| STEVENS CO PUD - WEST SHORE | 505 | 20 | — |
| LIBERTY SCHOOL DISTRICT #362 | 486 | 27 | — |
| SPO CO WATER DIST 3 SYS 5 | 485 | 2 | — |
| PIONEER WATER COMPANY | 443 | 46 | — |
| FOUR LAKES WATER DISTRICT 10 | 433 | 22 | — |
| WSDP MT SPOKANE STATE PARK #6 | 403 | 29 | — |
| UPPER COLUMBIA ACADEMY | 380 | 54 | — |