| CITY OF SACRAMENTO MAIN | 520,407 | 4 | Detected |
| SACRAMENTO SUBURBAN WATER DISTRICT | 194,444 | 23 | Detected |
| SCWA - LAGUNA/VINEYARD | 184,896 | 2 | Detected |
| FOLSOM, CITY OF - MAIN | 80,969 | 8 | Clean |
| CITRUS HEIGHTS WATER DISTRICT | 67,818 | 8 | Detected |
| CAL AM - SUBURBAN ROSEMONT | 54,793 | 4 | Detected |
| CAL AM - PARKWAY | 50,573 | 3 | Detected |
| CAL AM - LINCOLN OAKS | 48,094 | 2 | Detected |
| GOLDEN STATE WATER CO. - CORDOVA | 47,161 | 12 | Clean |
| ELK GROVE WATER DISTRICT | 43,813 | 6 | Detected |
| SACRAMENTO INTERNATIONAL AIRPORT [SWS] | 41,717 | 2 | Clean |
| CARMICHAEL WATER DISTRICT | 41,193 | 4 | Detected |
| FAIR OAKS WATER DISTRICT | 36,226 | 0 | Clean |
| CAL AM - ANTELOPE | 35,534 | 1 | Detected |
| SCWA MATHER-SUNRISE | 30,825 | 5 | Clean |
| SAN JUAN WATER DISTRICT | 29,598 | 2 | Clean |
| GALT, CITY OF | 26,536 | 47 | — |
| ORANGE VALE WATER COMPANY | 16,861 | 6 | Clean |
| CAL AM - FRUITRIDGE VISTA | 15,652 | 8 | Clean |
| RIO LINDA/ELVERTA COMMUNITY WATER DIST | 15,460 | 19 | Detected |
| SCWA - ARDEN PARK VISTA | 10,101 | 4 | Detected |
| CALIFORNIA STATE FAIR | 9,280 | 8 | Detected |
| FLORIN COUNTY WATER DISTRICT | 7,831 | 45 | Detected |
| FOLSOM STATE PRISON | 7,502 | 4 | Detected |
| RANCHO MURIETA COMMUNITY SERVI | 5,728 | 13 | Clean |
| GOLDEN STATE WATER CO - ARDEN WATER SERV | 5,658 | 6 | Clean |
| DEL PASO MANOR COUNTY WATER DI | 4,854 | 5 | Clean |
| CAL AM - ARDEN | 4,191 | 2 | Detected |
| FOLSOM, CITY OF - ASHLAND | 3,317 | 0 | Clean |
| GIBSON RANCH COUNTY PARK | 3,300 | 6 | — |
| NORTHGATE 880 [SWS] | 2,926 | 2 | — |
| RIO COSUMNES CORRECTIONAL CENTER [SWS] | 2,800 | 10 | — |
| METRO AIR PARK WATER SYSTEM | 2,500 | 3 | — |
| AMERICAN RIVER COLLEGE | 2,000 | 18 | — |
| SLAVIC MISSIONARY CHURCH INC | 1,800 | 33 | — |
| BRANCH CENTER [SWS] | 1,700 | 2 | — |
| CAL AM - ISLETON | 1,693 | 1 | — |
| BRANNAN ISLAND STATE REC. AREA | 1,622 | 5 | — |
| ELKHORN I-5 REST AREA | 1,000 | 0 | — |
| RICHARD A. MCGEE TRAINING CENTER | 975 | 9 | — |
| CHURCH OF JESUS CHRIST OF LDS (SWS) | 800 | 6 | — |
| MC CLELLAN MHP | 700 | 11 | — |
| CAL AM - WALNUT GROVE | 667 | 2 | — |
| TOKAY PARK WATER CO | 653 | 18 | — |
| FRANKLIN ELEMENTARY SCHOOL | 650 | 49 | — |
| GRAND ISLAND MANSION | 600 | 4 | — |
| ST MARIA GORETTI PARISH (SWS) | 600 | 1 | — |
| COSUMNES RIVER ELEMENTARY SCHOOL | 560 | 3 | — |
| RANCHO SECO PARK | 558 | 5 | — |
| ARCOHE ELEM SCHOOL - MAIN CAMPUS | 465 | 7 | — |