| LCA ALLENTOWN DIVISION | 118,000 | 43 | Detected |
| LCA WLSA CENTRAL DIVISION | 47,693 | 283 | Detected |
| SWT MAIN SYSTEM | 14,500 | 536 | Detected |
| EMMAUS BOROUGH PUBLIC WATER | 14,000 | 319 | Detected |
| WHITEHALL TWP AUTHORITY | 13,063 | 369 | Detected |
| SALISBURY TWP WATER SYSTEM | 8,522 | 13 | Detected |
| LV HOSPITAL CEDAR CREST | 8,425 | 5 | — |
| UPPER SAUCON TWP WATER SUPPLY | 7,300 | 620 | Detected |
| CATASAUQUA MUN WATER WORKS | 6,598 | 121 | Detected |
| SLATINGTON BOROUGH WATER SYS | 4,450 | 112 | Detected |
| MACUNGIE BOROUGH AUTHORITY | 3,039 | 17 | — |
| LCA NORTH WHITEHALL DIVISION | 2,910 | 31 | Detected |
| COOPERSBURG MUN WATER AUTH | 2,570 | 203 | — |
| LEHIGH CARBON COMMUNITY COLLEG | 2,500 | 255 | — |
| LEHIGH CAREER & TECHNICAL INST | 2,400 | 129 | — |
| ALBURTIS BOROUGH AUTHORITY | 2,117 | 50 | — |
| DESALES UNIVERSITY | 2,000 | 54 | — |
| GREEN ACRES MHC | 1,475 | 88 | — |
| LCA ARCADIA WEST DIVISION | 1,392 | 56 | — |
| SWT ALLENTOWN CONS SYSTEM | 1,300 | 49 | — |
| LCA EMMAUS CONSECUTIVE DIV | 1,046 | 0 | — |
| LCA WASHINGTON TOWNSHIP DIV | 965 | 120 | — |
| NWLSD HIGH SCHOOL | 821 | 130 | — |
| KERNSVILLE ELEMENTARY SCHOOL | 750 | 31 | — |
| NWLSD MIDDLE SCHOOL | 681 | 113 | — |
| AQUA PA SPRINGHOUSE FARMS | 645 | 129 | — |
| NESTLE PURINA PETCARE CO | 640 | 69 | — |
| KIDSPEACE - ORCHARD HILLS CAMP | 640 | 16 | — |
| LIL WOLF MHP | 600 | 63 | — |
| NWLSD ELEMENTARY SCHOOL | 582 | 48 | — |
| GLENCREST MOBILE HOME PARK | 570 | 134 | — |
| HANOVER TOWNSHIP LEHIGH COUNTY | 520 | 59 | — |
| LCA HEIDELBERG HEIGHTS DIV | 509 | 414 | — |
| LEHIGH CC CLUB HOUSE SYSTEM | 500 | 23 | — |
| KEN-MAN WATER CO | 475 | 1,377 | — |
| HOMETOWN BREAKFAST BAR & GRILL | 450 | 10 | — |
| PETERS ELEMENTARY SCHOOL | 426 | 238 | — |
| BIG WOODYS | 400 | 21 | — |
| SHANKWEILERS DRIVE IN THEATER | 400 | 62 | — |
| YOCCOS SOUTH | 400 | 13 | — |
| RIVERVIEW ESTATES | 375 | 169 | — |
| JORDAN UNITED CHURCH OF CHRIST | 350 | 20 | — |
| ALLENTOWN LEHIGH VALLEY KOA | 340 | 56 | — |
| MILFORD BIBLE CAMP | 300 | 22 | — |
| ST PAULS UCC OF TREXLERTOWN | 300 | 76 | — |
| LCA MADISON NORTH DIVISION | 290 | 5 | — |
| AQUA PA COUNTRY CLUB GARDENS | 268 | 48 | — |
| LCA UPPER MILFORD CENTRAL DIV | 256 | 29 | — |
| TRIVET FAMILY RESTAURANT I | 250 | 26 | — |
| LEHIGH VALLEY ZOO | 250 | 23 | — |