| CITY OF RED BLUFF | 14,710 | 20 | Detected |
| CITY OF CORNING | 8,244 | 31 | Detected |
| RIO ALTO WATER DISTRICT | 3,329 | 8 | — |
| CALTRANS-RED BLUFF REST-NB | 2,600 | 4 | — |
| CALTRANS-RED BLUFF REST-SB | 2,500 | 5 | — |
| LOS MOLINOS COMM. SERVICES DIST. | 1,450 | 121 | — |
| GERBER LAS FLORES CSD | 1,200 | 6 | — |
| EVERGREEN UNION SCHOOL DISTRICT | 1,100 | 4 | — |
| R-WILD HORSE RANCH | 1,055 | 5 | — |
| WAL*MART DIST. CTR/ECO RES | 1,023 | 2 | — |
| BLACK BUTTE LAKE, BUCKHORN RA, USCOE | 700 | 6 | — |
| MINERAL COUNTY WATER DISTRICT | 634 | 22 | — |
| GERBER UNION ELEMENTARY SCHOOL DISTRICT | 625 | 8 | — |
| LASSEN VNP - MANZANITA LAKE | 606 | 0 | — |
| RIO VISTA MOBILE HOME PARK | 543 | 14 | — |
| CITY OF TEHAMA | 483 | 21 | — |
| VISTA GRANDE WATER SYSTEM | 468 | 15 | — |
| SIERRA PACIFIC INDUSTRIES - RED BLUFF MI | 450 | 1 | — |
| SKY VIEW COUNTY WATER | 412 | 15 | — |
| LASSEN VIEW UNION ELEMENTARY SCHOOL DIST | 350 | 7 | — |
| SIERRA PACIFIC INDUSTRIES - RICHFIELD | 350 | 1 | — |
| SIERRA PACIFIC INDUSTRIES - WINDOWS | 350 | 0 | — |
| BERRENDOS SCHOOL | 325 | 11 | — |
| RIVER RANCH MOBILE HOME PARK | 305 | 16 | — |
| BLACK BUTTE LAKE, HEADQUARTERS, USCOE | 300 | 5 | — |
| RICHFIELD ELEMENTARY SCHOOL | 280 | 1 | — |
| LASSEN VNP - SUMMIT LAKE | 251 | 2 | — |
| BLACK BUTTE LAKE, BUCKHORN GROUP, USCOE | 250 | 3 | — |
| DOLLAR GENERAL PROBERTA | 250 | 0 | — |
| LASSEN VNP - BUTTE LAKE | 240 | 0 | — |
| PASKENTA COMM. SERVICES DIST. | 237 | 85 | — |
| E HEADSTART | 220 | 7 | — |
| LAKE CALIFORNIA POA R.V. PARK | 200 | 4 | — |
| REEDS CREEK SCHOOL | 196 | 3 | — |
| LAS FLORES WATER WORKS | 191 | 25 | — |
| ANTELOPE CREEK MHP | 175 | 5 | — |
| CRAIN WALNUT SHELLING, INC. | 167 | 2 | — |
| SURREY VILLAGE WATER CO. INC. | 163 | 8 | — |
| WOODSON BRIDGE MHP | 158 | 17 | — |
| REYNOLDS CONSUMER PRODUCTS (RED BLUFF) | 150 | 6 | — |
| LASSEN VNP - LOST CREEK | 150 | 0 | — |
| MIRA MONTE WATER CO. | 145 | 20 | — |
| LASSEN VNP - SOUTHWEST/CHALET | 145 | 0 | — |
| MAYWOOD MOBILE HOME PARK | 140 | 19 | — |
| CAL FIRE - ISHI CONSERVATION CAMP | 135 | 8 | — |
| MOUNTAIN VALLEY APTS & RVP | 131 | 10 | — |
| CAL FIRE - SALT CREEK CONSERVATION CAMP | 130 | 6 | — |
| DEL ORO WC - LARKSPUR MEADOWS | 116 | 11 | — |
| CORNING RV PARK | 112 | 2 | — |
| KIRKWOOD ELEMENTARY SCHOOL | 111 | 5 | — |