| WALDORF - CHARLES COUNTY DPW | 84,296 | 19 | Detected |
| TOWN OF LA PLATA | 11,535 | 33 | Clean |
| BRYANS ROAD | 6,260 | 11 | Clean |
| TOWN OF INDIAN HEAD | 4,100 | 22 | Clean |
| NAVAL SUPPORT FACILITY, INDIAN HEAD | 3,321 | 58 | Detected |
| POTOMAC HEIGHTS | 1,800 | 93 | — |
| COLLEGE OF SOUTHERN MD - MAIN CAMPUS | 1,220 | 56 | — |
| HENRY E. LACKEY HIGH SCHOOL | 1,187 | 2 | — |
| MAURICE J. MCDONOUGH HIGH SCHOOL | 1,050 | 1 | — |
| STETHEM ED CNTR & JAMES CRAIK ELEMENTARY | 1,028 | 1 | — |
| WELCOME CENTER (NEWBURG) | 1,004 | 10 | — |
| SWAN POINT | 945 | 11 | — |
| BEANTOWN TEXACO FOOD -DASH IN | 900 | 13 | — |
| ST. MARYS BRYANTOWN CATHOLIC SCHOOL | 791 | 20 | — |
| CLIFFTON ON THE POTOMAC | 744 | 22 | — |
| PICCOWAXEN MIDDLE SCHOOL | 722 | 1 | — |
| HUNTERS BROOKE/FALCON RIDGE SUBD | 614 | 7 | — |
| T.C. MARTIN ELEMENTARY SCHOOL | 609 | 0 | — |
| CHARLES COUNTY GARDENS WATER | 551 | 17 | — |
| DASH IN FOOD STORE | 550 | 22 | — |
| NEW LIFE WESLEYAN CHURCH- LA PLATA | 520 | 6 | — |
| BRYANTOWN MALL | 512 | 64 | — |
| GALE-BAILEY ELEMENTARY | 497 | 1 | — |
| NAVAL SUPPORT FACILITY, STUMP NECK ANNEX | 495 | 5 | — |
| ST. PETERS SCHOOL | 493 | 4 | — |
| DR. THOMAS HIGDON ELEMENTARY | 488 | 5 | — |
| MALCOLM ELEMENTARY SCHOOL | 446 | 2 | — |
| SOUTHERN MARYLAND CHRISTIAN ACADEMY | 445 | 32 | — |
| GRACE CHRISTIAN ACADEMY | 410 | 38 | — |
| COLL. OF SO. MD TRADES & ENERGY TRAINING | 402 | 9 | — |
| MT. HOPE/ NANJEMOY ELEMENTARY SCHOOL | 385 | 1 | — |
| BENEDICT | 376 | 4 | — |
| KINGS MANOR - WHITE PLAINS WATER CO, INC | 372 | 11 | — |
| ST IGNATIUS CHURCH AND ST THOMAS MANOR | 353 | 7 | — |
| POMUNK WATER COMPANY DISTRIBUTION SYSTEM | 340 | 1 | — |
| IDLEWOOD PARK | 320 | 15 | — |
| BEL ALTON | 311 | 12 | — |
| DASH IN GLYMONT | 300 | 11 | — |
| ROBERT STETHEM MEMORIAL PARK | 300 | 0 | — |
| DOLLAR GENERAL - COBB ISLAND | 294 | 2 | — |
| CHURCH OF LATTER DAY SAINTS | 285 | 8 | — |
| CHAPEL POINT WDS/ JUDE HOUSE/ COMM CTR | 280 | 35 | — |
| MELWOOD RECREATION CENTER/ CAMP | 250 | 31 | — |
| AQUALAND CAMPGROUND | 240 | 3 | — |
| ELLENWOOD | 229 | 12 | — |
| HOTEL CHARLES | 218 | 20 | — |
| GOOD SAMARITAN PRESBYTERIAN | 202 | 2 | — |
| RED HILL WATER COMPANY, INC. | 200 | 32 | — |
| CAMP ST CHARLES- KITCHEN (WELL #1) | 200 | 15 | — |
| CAPTAIN JOHNS CRABHOUSE | 200 | 16 | — |