| FLAGSTAFF CITY OF | 76,960 | 1,061 | Detected |
| GRAND CANYON NATIONAL PARK | 16,590 | 424 | Clean |
| ARIZONA WATER CO - SEDONA | 12,104 | 259 | Detected |
| DONEY PARK WATER | 8,996 | 604 | Clean |
| ARIZONA WATER CO - PINEWOOD | 8,089 | 48 | Clean |
| PAGE CITY OF | 7,420 | 173 | Detected |
| GLEN CANYON NRA WAHWEAP | 4,439 | 403 | Detected |
| KACHINA VILLAGE DWID | 3,500 | 216 | Clean |
| WILLIAMS CITY OF | 3,145 | 314 | — |
| BLUE RIDGE DWID | 1,920 | 98 | — |
| FOREST LAKES WATER IMPROVEMENT DISTRICT | 1,746 | 111 | — |
| UTILITY SOURCE LLC | 1,710 | 113 | — |
| HYDRO RESOURCES-TUSAYAN | 1,710 | 306 | — |
| FOREST HIGHLANDS WATER COMPANY | 1,668 | 83 | — |
| PONDEROSA UTILITY CORP | 1,585 | 134 | — |
| AZ STATE PARKS SLIDE ROCK | 1,500 | 93 | — |
| BEARIZONA | 1,423 | 45 | — |
| FREDONIA TOWN OF | 1,327 | 415 | — |
| CAMERON TRADING POST | 1,270 | 320 | — |
| ADOT AIRPORT GRAND CANYON | 1,140 | 317 | — |
| ADOT METEOR CRATER REST AREA | 1,006 | 44 | — |
| ADOT OAK CREEK RIM M/S - OVERLOOK VISTA | 1,000 | 36 | — |
| WUPATKI NATIONAL MONUMENT | 1,000 | 46 | — |
| USFS ASNF WOODS CANYON - ASPEN CAMP AREA | 900 | 63 | — |
| GCNRA LEES FERRY | 890 | 138 | — |
| GREENEHAVEN WATER COMPANY | 807 | 121 | — |
| METEOR CRATER VISITOR CENTER | 750 | 56 | — |
| STURGEON CROMER ELEM SCHOOL | 750 | 208 | — |
| HAPPY JACK RV PARK | 750 | 16 | — |
| WALNUT CANYON NATL MONUMENT | 700 | 24 | — |
| NEWTON WATER WELL | 665 | 176 | — |
| USFS CONF PINE FLAT CAMPGROUND | 650 | 54 | — |
| YOUNG LIFE LOST CANYON CAMPGROUND | 600 | 33 | — |
| CLINTS WELL GAS AND GO | 500 | 69 | — |
| THRIFTWAY STORE #281 GRAY MOUNTAIN | 450 | 70 | — |
| GRAND CANYON JUNCTION HYDRO | 430 | 205 | — |
| GRAND CANYON CAVERNS | 400 | 122 | — |
| HIDDEN HOLLOW MHC | 400 | 103 | — |
| CS MORMON LAKE WATER COMPANY | 353 | 90 | — |
| MORMON LAKE LODGE | 350 | 30 | — |
| CAMP NAVAJO | 350 | 90 | — |
| CS FLAGSTAFF RANCH WATER COMPANY | 350 | 179 | — |
| CS MORMON LAKE-UPPER VILLAGE | 324 | 40 | — |
| MARBLE CANYON LODGE | 300 | 194 | — |
| USFS ASNF CANYON POINT CAMPGROUND | 300 | 20 | — |
| USFS CONF CAVE SPRINGS | 280 | 30 | — |
| UNDER CANVAS GRAND CANYON | 275 | 0 | — |
| GRAND CANYON DRINKING WATER | 260 | 73 | — |
| MUSTANG RIVER GRILL | 250 | 36 | — |
| MOUNTAIN DELL WATER INC | 250 | 123 | — |