| MEADVILLE AREA WATER AUTHORITY | 17,339 | 97 | Clean |
| TITUSVILLE MUNICIPAL WATER | 6,146 | 138 | Detected |
| CAMBRIDGE SPRINGS BOROUGH | 2,363 | 265 | — |
| AQUA PA CRAWFORD DIV | 2,300 | 163 | — |
| LINESVILLE MUNICIPAL AUTHORITY | 1,600 | 74 | — |
| SAEGERTOWN BOROUGH | 1,500 | 631 | — |
| VERNON TWP WATER AUTHORITY | 1,500 | 31 | — |
| SAEGERTOWN ELEM AND HIGH SCH | 1,375 | 223 | — |
| SPRINGBORO AREA WATER AUTH | 1,175 | 223 | — |
| COCHRANTON BORO WATER DEPT | 1,136 | 150 | — |
| CONNEAUT LAKE BOROUGH WTP | 870 | 264 | Detected |
| CONNEAUTVILLE BORO WATER DEPT | 850 | 650 | — |
| NEW BEGINNINGS CHURCH OF GOD | 850 | 46 | — |
| MEADVILLE CAMPGROUND | 700 | 149 | — |
| MAPLEWOOD JR/SR HIGH SCHOOL | 600 | 106 | — |
| MAPLEWOOD ELEMENTARY SCHOOL | 500 | 129 | — |
| TUTTLE BEACH CAMPGROUND | 500 | 70 | — |
| WEST END ELEMENTARY SCHOOL | 500 | 99 | — |
| CONNEAUT LAKE MIDDLE SCHOOL | 450 | 231 | — |
| AUTUMN HILLS WATER COMPANY | 338 | 115 | — |
| PA DOT REST AREA 19 | 300 | 36 | — |
| PA DOT REST AREA 20 | 300 | 30 | — |
| WHITE HAVEN CAMPGROUND | 300 | 74 | — |
| PYMATUNING SPILLWAY CONCESSION | 273 | 50 | — |
| MEADVILLE HOUSING NORTHGATE | 256 | 55 | — |
| CONNEAUT LAKE PARK WATER | 250 | 348 | — |
| HYDETOWN ELEMENTARY SCHOOL | 250 | 309 | — |
| MILLERS FOOD FACTORY | 250 | 30 | — |
| GENEVA FAST STOP | 250 | 25 | — |
| CAMBRIDGE AREA JOINT AUTH | 225 | 93 | — |
| FOREST GREEN ESTATES | 225 | 418 | — |
| CANADOHTA WATER CO-OP ASSN | 220 | 13 | — |
| SAEGERTOWN MHP | 200 | 280 | — |
| RIVERSIDE GOLF CLUB | 200 | 52 | — |
| ST HIPPOLYTE CATHOLIC CHURCH | 200 | 50 | — |
| PYMATUNING SP JAMESTOWN CG | 200 | 19 | — |
| FAIRGROUNDS BASEBALL FIELDS | 200 | 67 | — |
| FAITH BUILDERS | 200 | 58 | — |
| WOODLANDS MOBILE HOME PARK | 175 | 70 | — |
| VITRO MEADVILLE FLAT GLASS | 175 | 59 | — |
| MEADVILLE FORGING CO MAIN BLDG | 170 | 582 | — |
| LAKEVIEW MANOR MHP | 150 | 326 | — |
| PLAYLAND LEISURE PARK & FAMILY | 150 | 109 | — |
| JAMES D BOWERS VFW POST 169 | 150 | 37 | — |
| COUNTRY CORNER INN | 150 | 74 | — |
| FATBOYS SALOON | 150 | 69 | — |
| WHISPERING PINES GOLF COURSE | 150 | 83 | — |
| STATION 4 FIREHOUSE GRILLE | 150 | 50 | — |
| CRAWFORD CHRISTIAN ACADEMY | 150 | 15 | — |
| FOUNTAIN HOUSE TRAILER COURT | 125 | 356 | — |