| LOWER BUCKS CO JOINT MUN AUTH | 63,007 | 327 | Clean |
| AQUA PA BENSALEM | 59,001 | 49 | Detected |
| BCWSA MAIN LOWER SOUTH | 52,621 | 204 | Detected |
| WARMINSTER MUNICIPAL AUTHORITY | 40,000 | 2,250 | Detected |
| NEWTOWN ARTESIAN WATER CO | 38,500 | 495 | Detected |
| NORTHAMPTON BUCKS CO MUN AUTH | 36,750 | 2,055 | Detected |
| PA AMERICAN WATER CO YARDLEY | 33,171 | 126 | Detected |
| AQUA PA BRISTOL | 28,727 | 92 | Detected |
| FALLS TWP WATER & SEWER DEPT | 24,400 | 144 | Detected |
| NWWA WARRINGTON TOWNSHIP | 21,588 | 1,675 | Detected |
| UPPER SOUTHAMPTON MUN AUTH | 16,000 | 856 | Detected |
| PERKASIE REGIONAL AUTHORITY | 15,000 | 735 | Detected |
| WARWICK TWP WATER & SEWER AUTH | 14,699 | 245 | Detected |
| MORRISVILLE MUNIC AUTHORITY | 13,342 | 1,069 | Detected |
| QUAKERTOWN BORO | 12,800 | 687 | Detected |
| DOYLESTOWN BORO WATER DEPT | 8,700 | 210 | Detected |
| DTMA MAIN SYSTEM | 8,655 | 203 | Detected |
| RICHLAND TWP WATER AUTHORITY | 6,800 | 555 | Detected |
| AQUA PA CHALFONT | 5,900 | 116 | Detected |
| HILLTOWN TWP WATER&SEWER AUTH | 5,770 | 1,138 | Detected |
| BUCKINGHAM TWP COLD SPRING | 4,760 | 54 | Detected |
| MILFORD TWP WATER AUTHORITY | 4,497 | 161 | Detected |
| BUCKINGHAM TWP FURLONG | 4,150 | 151 | — |
| BEDMINSTER MUN AUTH | 3,042 | 235 | — |
| BCWSA NEW HOPE | 3,017 | 995 | — |
| PLUMSTEAD NORTHERN SYSTEM | 2,605 | 635 | Detected |
| BOROUGH OF DUBLIN | 2,200 | 458 | — |
| NESHAMINY MANOR CENTER | 2,100 | 3,037 | — |
| BCWSA SOLEBURY | 2,100 | 204 | — |
| QUAKERTOWN FARMERS MARKET | 2,000 | 560 | — |
| GRAND VIEW HOSPITAL | 1,880 | 947 | — |
| TWP OF UPPER MAKEFIELD | 1,800 | 330 | — |
| CBSD CENTRAL BUCKS EAST HS | 1,725 | 83 | — |
| PLUMSTEAD TWP PATRIOTS RIDGE | 1,704 | 21 | — |
| KEYSTONE TRADE CENTER | 1,454 | 755 | — |
| RICHLANDTOWN WATER DEPARTMENT | 1,450 | 1,203 | — |
| CBSD HOLICONG MS | 1,300 | 89 | — |
| VILLAGE OF BUCKINGHAM SPRINGS | 1,295 | 211 | — |
| PLUMSTEAD TWP SUMMER HILL MEAD | 1,284 | 272 | — |
| CBSD TOHICKON MIDDLE SCHOOL | 1,100 | 43 | — |
| NWWA LOGAN SQUARE | 1,000 | 695 | — |
| RIEGELSVILLE WATER AUTHORITY | 980 | 399 | — |
| TRUMBAUERSVILLE MUN WATERWORKS | 974 | 989 | — |
| CBSD GROVELAND ES | 961 | 25 | — |
| PEDDLERS VILLAGE | 960 | 184 | — |
| UMH ARBOR ESTATES | 920 | 171 | — |
| NWWA OLDE COLONIAL GREENE | 900 | 251 | — |
| DUNKIN DONUTS NEWTOWN | 900 | 12 | — |
| SOL FEINSTONE ELEM SCHOOL | 900 | 525 | — |
| RICHLAND MEADOWS MHP | 750 | 238 | — |