| CONCORD CARE CENTER OF HARTFORD | | 99 | 0.0558 mg/L |
| RANCH OF OPPORTUNITY PWS | | 55 | 0.0513 mg/L |
| WILLIAMS CO/HILLSIDE COUNTRY LIVING | | 225 | 0.0490 mg/L |
| DEFIANCE CITY | | 16,494 | 0.0487 mg/L |
| WAYNE COUNTY CARE CENTER | | 225 | 0.0447 mg/L |
| INDIAN LAKE REHABILATION CENTER | | 53 | 0.0440 mg/L |
| SMITHVILLE WESTERN LIMITED | | 480 | 0.0430 mg/L |
| ATTICA VILLAGE | | 1,148 | 0.0422 mg/L |
| LEXVIEW ALLOTMENT | | 225 | 0.0393 mg/L |
| NEWARK CITY PWS | | 49,934 | 0.0370 mg/L |
| PEBBLE CREEK CONVALESCENT CENTER | | 240 | 0.0338 mg/L |
| WARSAW PWS | | 782 | 0.0322 mg/L |
| MCARTHUR, VILLAGE OF | | 1,920 | 0.0320 mg/L |
| TIMBERBROOK MOBILE HOME PARK | BRISTOL | 1,418 | 0.0320 mg/L |
| MILFORD CITY PWS | | 6,700 | 0.0310 mg/L |
| CHARDON ESTATES | | 217 | 0.0295 mg/L |
| LOUISVILLE GARDENS HEALTH CENTER | | 81 | 0.0291 mg/L |
| LINCOLN SQUARE APARTMENTS | | 125 | 0.0290 mg/L |
| CHRISTI WATER SYSTEM INC | | 483 | 0.0280 mg/L |
| FLUSHING VILLAGE PWS | | 803 | 0.0266 mg/L |
| LEESBURG VILLAGE | | 1,315 | 0.0260 mg/L |
| COUNTRY ACRES MOBILE HOME PARK | MUNCIE | 150 | 0.0255 mg/L |
| COUNTRY MEADOWS CONDO. | | 65 | 0.0250 mg/L |
| AQUA OHIO - SHEPARD HILLS PWS | | 725 | 0.0242 mg/L |
| CEDARVILLE UNIVERSITY | | 4,000 | 0.0238 mg/L |
| SYLVANIA CITY | | 21,618 | 0.0230 mg/L |
| CARROLL WATER AND SEWER | | 2,288 | 0.0230 mg/L |
| GRAFTON VILLAGE PWS | | 2,769 | 0.0220 mg/L |
| MEADOWOOD WATER ASSOCIATION | | 140 | 0.0220 mg/L |
| PIKETON VILLAGE PWS | | 2,181 | 0.0214 mg/L |
| ARCADIA VILLAGE PWS | | 564 | 0.0210 mg/L |
| FAIR HAVEN SHELBY COUNTY HOME | | 290 | 0.0210 mg/L |
| AVON MOBILE HOME PARK | | 138 | 0.0200 mg/L |
| PUTNAM COMMUNITY WATER ASSOCIATION PWS | | 2,744 | 0.0198 mg/L |
| RAINBOW WATER | CARMEL (T) | 432 | 0.0190 mg/L |
| GAHANNA CITY PWS | | 33,258 | 0.0186 mg/L |
| ORANGEWOOD MOBILE HOME PARK | DELAND | 67 | 0.0185 mg/L |
| REYNOLDSBURG CITY PWS | | 37,847 | 0.0185 mg/L |
| EAST LIVERPOOL CITY | | 12,586 | 0.0180 mg/L |
| COUNTRY POINTE WOOSTER SUB-ACUTE PWS | | 84 | 0.0180 mg/L |
| MOHICAN YOUNG STAR ACADEMY | | 150 | 0.0178 mg/L |
| COLUMBUS PUBLIC WATER SYSTEM | | 1,305,946 | 0.0177 mg/L |
| FOWLER MOBILE HOME PARK | | 69 | 0.0175 mg/L |
| ROCKFORD VILLAGE | | 1,120 | 0.0171 mg/L |
| WESTVIEW MHP | | 450 | 0.0170 mg/L |
| COLUMBUS GROVE VILLAGE | | 2,137 | 0.0168 mg/L |
| PM ESTATES PWS | | 197 | 0.0163 mg/L |
| MID-OHIO WSD - JACKSON STREET WTP | | 4,467 | 0.0160 mg/L |
| GRANGER LAKE CONDO 1 PWS | | 131 | 0.0159 mg/L |
| LOCKBOURNE VILLAGE PWS | | 275 | 0.0157 mg/L |
| WRIGHT STATE UNIVERSITY | | 8,948 | 0.0154 mg/L |
| APPLE CREEK VILLAGE PWS | | 1,190 | 0.0154 mg/L |
| STRYKER VILLAGE | | 1,259 | 0.0150 mg/L |
| NORTHWESTERN W AND SD - OREGON WTLN 200 | | 9,629 | 0.0150 mg/L |
| CHESTERHILL VILLAGE PWS | | 823 | 0.0150 mg/L |
| SOUTH CHARLESTON VILLAGE PWS | | 1,660 | 0.0149 mg/L |
| COUNTRY MEADOW CARE CENTER | | 80 | 0.0149 mg/L |
| PAINESVILLE CITY PWS | | 31,728 | 0.0149 mg/L |
| MAUMEE CITY | | 14,286 | 0.0148 mg/L |
| BELLBROOK WATER WORKS | | 9,475 | 0.0147 mg/L |
| AQUA OHIO - FIRESTONE TRACE | | 336 | 0.0147 mg/L |
| EATON PUBLIC WATER SYSTEM | | 8,400 | 0.0147 mg/L |
| BUTLER CO. WATER DISTRICT 2 PWS | | 116,572 | 0.0146 mg/L |
| GUILFORD HIGHLANDS MOBILE HOME PARK PWS | | 103 | 0.0145 mg/L |
| NORTH RIDGEVILLE CITY PWS | | 29,465 | 0.0144 mg/L |
| BAINBROOK WATER COMPANY PWS | | 339 | 0.0144 mg/L |
| BEAVER PWS | | 480 | 0.0143 mg/L |
| HAMLER VILLAGE | | 580 | 0.0143 mg/L |
| WILMINGTON CITY PWS | | 12,401 | 0.0143 mg/L |
| NEW LEBANON VILLAGE PWS | | 3,770 | 0.0142 mg/L |
| LEBANON CORRECTIONAL INSTITUTION | | 3,410 | 0.0142 mg/L |
| VILLA VISTA MOBILE HOME | | 236 | 0.0142 mg/L |
| PRESERVE PLACE | | 95 | 0.0142 mg/L |
| AVON CITY PWS | | 23,800 | 0.0140 mg/L |
| LOVELAND CITY PWS | | 12,800 | 0.0140 mg/L |
| ROAMING SHORES VILLAGE PWS | | 1,764 | 0.0140 mg/L |
| DUNKIRK VILLAGE PWS | | 875 | 0.0140 mg/L |
| REPUBLIC VILLAGE | | 550 | 0.0140 mg/L |
| NORTHERN OHIO RURAL WATER | | 18,224 | 0.0140 mg/L |
| WOOSTER ROLLING WHEELS ESTATES MHP | | 169 | 0.0140 mg/L |
| LAKE VIEW VILLAGE MHP | | 56 | 0.0139 mg/L |
| ERIE CO PERKINS DISTRICT | | 17,241 | 0.0139 mg/L |
| RIO GRANDE | | 830 | 0.0138 mg/L |
| BRYAN CITY PWS | | 8,729 | 0.0138 mg/L |
| KNOX COUNTY WATER AND WASTEWATER PWS | | 7,710 | 0.0138 mg/L |
| COLONIAL HILLS MHP | | 185 | 0.0138 mg/L |
| ECHO LAKE COMMUNITY ASSOCIATION | | 58 | 0.0137 mg/L |
| WASHINGTONVILLE VILLAGE PWS | | 801 | 0.0137 mg/L |
| JOHNSON MOBILE HOME PARK | | 72 | 0.0136 mg/L |
| WILLIAMSBURG VILLAGE PWS | | 2,490 | 0.0136 mg/L |
| GRATIS VILLAGE PWS | | 990 | 0.0136 mg/L |
| OAKWOOD VILLAGE PWS | | 727 | 0.0135 mg/L |
| SCENIC CREEK APARTMENTS PWS | | 80 | 0.0135 mg/L |
| TWIN PINES MHP | | 69 | 0.0135 mg/L |
| DELPHOS CITY | | 7,101 | 0.0134 mg/L |
| WELLINGTON VILLAGE PWS | | 4,802 | 0.0134 mg/L |
| NORTHWESTERN W AND SD - MCCOMB | | 1,527 | 0.0134 mg/L |
| AUTUMN HILLS HEALTHCARE COMMUNITY | | 87 | 0.0134 mg/L |
| BLUE RIVER ESTATES MOBILE HOME PARK | EDINBURG | 99 | 0.0132 mg/L |
| WILMOT VILLAGE PWS | | 325 | 0.0132 mg/L |