| CAL-WATER SERVICE CO.-CHICO | 114,925 | 17 | Detected |
| SOUTH FEATHER W&P - MINERS RANCH | 22,664 | 0 | Clean |
| BUTTE-GLENN COMMUNITY COLLEGE DIST | 18,000 | 4 | Clean |
| THERMALITO WATER & SEWER DIST | 12,136 | 11 | Detected |
| CAL-WATER SERVICE CO.-OROVILLE | 11,106 | 4 | Detected |
| DEL ORO WATER CO.-PARADISE PINES | 10,940 | 16 | — |
| PARADISE IRRIGATION DISTRICT | 9,142 | 21 | Clean |
| GRAY LODGE CHECK STATION | 8,000 | 2 | — |
| CITY OF GRIDLEY | 7,269 | 11 | Detected |
| CITY OF BIGGS | 2,060 | 25 | — |
| DURHAM IRRIGATION DISTRICT | 1,581 | 11 | — |
| PALERMO BIBLE FAMILY CHURCH | 1,000 | 4 | — |
| DEL ORO WATER CO.-LIME SADDLE MARINA | 895 | 2 | — |
| CHICO GRANGE #486 | 800 | 8 | — |
| CASA DE ALMA EL CAMERON PELAO | 750 | 2 | — |
| PLEASANT VALLEY BAPTIST CHURCH | 600 | 53 | — |
| DWR-MONUMENT HILL RESTROOMS | 593 | 2 | — |
| DEL ORO WATER CO.-STIRLING BLUFFS | 521 | 14 | — |
| CHICO EASTSIDE LITTLE LEAGUE | 500 | 12 | — |
| GRIDLEY FARM LABOR HOUSING | 460 | 15 | — |
| BUTTE CREEK ESTATES MUTUAL WATER CO | 399 | 26 | — |
| SIERRA NEVADA BREWING CO. | 350 | 2 | — |
| DEL ORO WATER CO.-MAGALIA | 340 | 8 | — |
| PLEASANT GROVE MHP | 327 | 45 | — |
| BIDWELL PARK GOLF COURSE | 325 | 15 | — |
| LAKE MADRONE WATER DISTRICT | 297 | 37 | — |
| MANZANITA ELEMENTARY SCHOOL | 295 | 10 | — |
| GRAN MUTUAL WATER CO | 290 | 7 | — |
| GOLDEN FEATHER MHP | 275 | 34 | — |
| ALMOND GROVE MOBILE PARK | 253 | 20 | — |
| LUNDBERG FAMILY FARM | 240 | 19 | — |
| NORD COUNTRY SCHOOL | 230 | 15 | — |
| DINGERVILLE USA PARK | 220 | 13 | — |
| SILVER DOLLAR FAIRGROUNDS | 195 | 14 | — |
| FOOTHILLS MANUFACTURED HOME COMMUNUTY | 180 | 92 | — |
| FEDEX GROUND | 180 | 4 | — |
| KEEFER CREEK ESTATES | 160 | 10 | — |
| LIBERTY 1ST WARD MEETING HOUSE | 151 | 2 | — |
| YOUTH WITH A MISSION-SPRINGS OF LIVING W | 150 | 5 | — |
| PARADISE ADVENTIST CHURCH | 150 | 6 | — |
| G & J PROPERTIES | 130 | 14 | — |
| FOREST RANCH CHARTER SCHOOL | 125 | 12 | — |
| RIVER REFLECTIONS RV & CAMPGROUND | 125 | 19 | — |
| SIERRA MOON MUTUAL WATER COMPANY | 120 | 42 | — |
| FOREST RANCH MUTUAL WATER SYSTEM | 119 | 32 | — |
| DEL ORO WATER COMPANY - BUZZTAIL DIST. | 106 | 16 | — |
| DURHAM DAYTON INDUSTRIAL PARTNERS-PRO PA | 102 | 16 | — |
| PSEA CAMP - DESABLA | 100 | 8 | — |
| DOWN RANGE INDOOR TRAINING CENTER | 100 | 2 | — |
| MERRY MOUNTAIN MUTUAL | 90 | 33 | — |