| SPRINGFIELD CITY PWS | 60,680 | 12 | Clean |
| CLARK COUNTY NORTHRIDGE PWS | 8,874 | 14 | Clean |
| NEW CARLISLE CITY PWS | 5,800 | 31 | Detected |
| CLARK COUNTY PARK LAYNE PWS | 4,221 | 25 | Clean |
| CLARK COUNTY GREEN MEADOWS 2 PWS | 3,008 | 5 | Clean |
| ENON VILLAGE PWS | 2,415 | 135 | — |
| TECUMSEH SCHOOLS MAIN CAMPUS | 2,100 | 90 | — |
| SOUTH CHARLESTON VILLAGE PWS | 1,660 | 113 | — |
| YOUNGS JERSEY DAIRY PWS | 1,340 | 36 | — |
| CLARK-SHAWNEE LOCAL PK-6 SCHOOL PWS | 1,120 | 8 | — |
| SHAWNEE HIGH SCHOOL | 950 | 28 | — |
| FAIRWAY TERRACE MHP PWS | 800 | 118 | — |
| HEART OF OHIO ANTIQUE PWS | 750 | 13 | — |
| SIMS AND MURRY MARATHON PWS | 750 | 9 | — |
| NORTH HAMPTON VILLAGE PWS | 538 | 125 | — |
| HARMONY ESTATES MOBILE HOME PARK | 507 | 32 | — |
| TOMORROWS STARS - BACK | 499 | 77 | — |
| BROOKSIDE VILLAGE MHP PWS | 475 | 213 | — |
| DONNELSVILLE ELEMENTARY CAMPUS | 450 | 250 | — |
| CHATEAU ESTATES MHP PWS | 430 | 110 | — |
| NORTHEASTERN ATHLETIC COMPLEX | 423 | 134 | — |
| LOCUST HILLS GOLF CLUB-CLUBHOUSE | 400 | 4 | — |
| SOUTH VIENNA VILLAGE PWS | 393 | 232 | — |
| CLARK COUNTY ROCKWAY PWS | 383 | 9 | — |
| CLARK COUNTY LAWRENCEVILLE PWS | 302 | 206 | — |
| PORTS PETROLEUM | 280 | 23 | — |
| GARDEN ACRES WATER COMPANY PWS | 260 | 14 | — |
| CATAWBA VILLAGE PWS | 241 | 34 | — |
| MAYBERRY MINI-MART PWS | 237 | 90 | — |
| COUNTRY HAVEN MHP PWS | 234 | 234 | — |
| HONEY CREEK VILLAGE MHP PWS | 225 | 361 | — |
| HUSTEAD MARATHON PWS | 225 | 33 | — |
| DOLLAR GENERAL SPRINGFIELD MADRIVER | 224 | 0 | — |
| DOLLAR GENERAL #24617 - NEW CARLISLE | 224 | 4 | — |
| KONE KORNER | 222 | 67 | — |
| CLARK COUNTY LIMECREST PWS | 215 | 1 | — |
| 571 GRILL AND DRAFT HOUSE | 212 | 30 | — |
| GREENLAWN CONDOS | 203 | 348 | — |
| ENON BEACH CAMPGROUND | 194 | 26 | — |
| SPRINGFIELD HOUSE MIMIS HOUSE OF LITTLES | 185 | 375 | — |
| IPL DAYTON INC | 181 | 268 | — |
| LAWRENCEVILLE CHURCH OF GOD PWS | 175 | 9 | — |
| HERITAGE FELLOWSHIP CHURCH | 170 | 70 | — |
| SUGAR ISLE GOLF COURSE | 162 | 47 | — |
| RISEN CHRIST LUTHERAN CHURCH PWS | 160 | 116 | — |
| BROOKWOOD MHP PWS | 145 | 80 | — |
| BETHEL COMMUNITY CHURCH OF THE NAZARENE | 130 | 33 | — |
| GREENON ATHLETIC BUILDING | 129 | 188 | — |
| FOREST VALLEY FREE WILL BAPT CHURCH PWS | 125 | 33 | — |
| WOODBURY APARTMENTS PWS | 120 | 1,407 | — |