| SOUTH BEND WATER WORKS Groundwater | IN5271014 | 8 | 2 | |
| BROWN COUNTY WATER UTILITY Groundwater | IN5207001 | 6 | 2 | |
| HANOVER WATER DEPARTMENT Groundwater | IN5239003 | 3 | 2 | |
| JACKSON COUNTY WATER UTILITY Groundwater | IN5236003 | 2 | 2 | |
| ELKHART PUBLIC WORKS AND UTILITIES Groundwater | IN5220008 | 6 | 1 | |
| PIKE-GIBSON WATER, INC. Surface Water | IN5263003 | 5 | 1 | |
| MISHAWAKA UTILITIES Groundwater | IN5271009 | 5 | 1 | |
| INDIANA AMERICAN WATER - TERRE HAUTE Groundwater | IN5284012 | 3 | 1 | |
| WEST TERRE HAUTE WATER Groundwater | IN5284015 | 3 | 1 | |
| GREENVILLE WATER UTILITY Groundwater | IN5222004 | 2 | 1 | |
| GIBSON WATER, INC. Surface Water | IN5226009 | 2 | 1 | |
| MADISON WATER DEPARTMENT, IN Groundwater | IN5239006 | 2 | 1 | |
| UNIVERSITY OF NOTRE DAME Groundwater | IN5271020 | 2 | 1 | |
| INDIANA AMERICAN WATER - CHARLESTOWN Groundwater | IN5210003 | 1 | 1 | |
| MARYSVILLE OTISCO NABB WATER CORP. Groundwater | IN5210006 | 1 | 1 | |
| PALMYRA WATER WORKS Groundwater | IN5231004 | 1 | 1 | |
| RAMSEY WATER COMPANY, INC. Groundwater | IN5231005 | 1 | 1 | |
| ANDERSON WATER DEPARTMENT GU | IN5248002 | 1 | 1 | |
| TELL CITY WATER DEPARTMENT Groundwater | IN5262004 | 1 | 1 | |
| PURDUE UNIV. WATER WORKS Groundwater | IN5279015 | 6 | 0 | |
| COLUMBUS MUNICIPAL UTILITY Groundwater | IN5203002 | 4 | 0 | |
| SOUTHWESTERN BARTHOLOMEW WATER CORP. Groundwater | IN5203008 | 4 | 0 | |
| CITIZENS WATER - INDIANAPOLIS Groundwater | IN5249004 | 4 | 0 | |
| MOUNT VERNON WATER WORKS Surface Water | IN5265006 | 4 | 0 | |
| SOUTH PARK BUSINESS CENTER Groundwater | IN2410017 | 3 | 0 | |
| WHITESTOWN SOUTH Surface Water | IN5206014 | 3 | 0 | |
| PLAINFIELD WATER WORKS Groundwater | IN5232020 | 3 | 0 | |
| BARGERSVILLE WATER DEPARTMENT Groundwater | IN5241001 | 3 | 0 | |
| INDIANA AMERICAN WATER - JOHNSON COUNTY Groundwater | IN5241005 | 3 | 0 | |
| SPEEDWAY WATER WORKS Surface Water | IN5249008 | 3 | 0 | |
| NEW HAVEN WATER DEPARTMENT MX | IN5202009 | 2 | 0 | |
| FORT WAYNE - 3 RIVERS FILTRATION PLANT MX | IN5202020 | 2 | 0 | |
| GOSHEN WATER UTILITY Groundwater | IN5220009 | 2 | 0 | |
| INDIANA AMERICAN WATER - NOBLESVILLE Groundwater | IN5229015 | 2 | 0 | |
| BROWNSBURG WATER WORKS Surface Water | IN5232002 | 2 | 0 | |
| DANVILLE WATER WORKS MX | IN5232004 | 2 | 0 | |
| PITTSBORO WATER COMPANY MX | IN5232019 | 2 | 0 | |
| WHITELAND WATER WORKS Groundwater | IN5241009 | 2 | 0 | |
| INDIANA AMERICAN WATER - WARSAW Groundwater | IN5243030 | 2 | 0 | |
| INDIANA AMERICAN WATER - CRAWFORDSVILLE Groundwater | IN5254005 | 2 | 0 | |
| ANGOLA WATER DEPARTMENT Groundwater | IN5276001 | 2 | 0 | |
| CLINTON WATER UTILITY Groundwater | IN5283004 | 2 | 0 | |
| LIPPERT COMPONENTS (PLANT #30) Groundwater | IN2201093 | 1 | 0 | |
| TRAIL TREE/MIDCONTINENT INN INC. Groundwater | IN2370087 | 1 | 0 | |
| BERNE WATER DEPARTMENT Groundwater | IN5201001 | 1 | 0 | |
| DECATUR WATER DEPARTMENT Groundwater | IN5201002 | 1 | 0 | |
| HUNTERTOWN WATER WORKS Groundwater | IN5202007 | 1 | 0 | |
| HARTFORD CITY WATER WORKS Groundwater | IN5205002 | 1 | 0 | |
| LEBANON UTILITIES Groundwater | IN5206003 | 1 | 0 | |
| ROYAL CENTER WATER UTILITY Groundwater | IN5209008 | 1 | 0 | |
| SELLERSBURG WATER DEPARTMENT Groundwater | IN5210010 | 1 | 0 | |
| AUBURN WATER DEPARTMENT Groundwater | IN5217001 | 1 | 0 | |
| GARRETT WATER UTILITY Groundwater | IN5217004 | 1 | 0 | |
| INDIANA AMERICAN WATER - MUNCIE Surface Water | IN5218012 | 1 | 0 | |
| IRELAND UTILITIES, INC. Surface Water | IN5219008 | 1 | 0 | |
| JASPER MUNICIPAL WATER UTILITY Surface Water | IN5219009 | 1 | 0 | |
| GAS CITY WATER DEPARTMENT Groundwater | IN5227006 | 1 | 0 | |
| MARION CITY WATER WORKS Groundwater | IN5227014 | 1 | 0 | |
| UPLAND WATER DEPARTMENT Groundwater | IN5227022 | 1 | 0 | |
| CARMEL WATER DEPARTMENT Groundwater | IN5229004 | 1 | 0 | |
| PLAINFIELD RE-ENTRY EDUCATIONAL FACILITY Groundwater | IN5232007 | 1 | 0 | |
| INDIANA AMERICAN WATER - KOKOMO Groundwater | IN5234007 | 1 | 0 | |
| HUNTINGTON WATER DEPARTMENT Groundwater | IN5235005 | 1 | 0 | |
| WARREN MUNICIPAL WATER WORKS Groundwater | IN5235012 | 1 | 0 | |
| RENSSELAER WATER DEPARTMENT Groundwater | IN5237005 | 1 | 0 | |
| NORTHWEST JASPER REGIONAL WATER DISTRICT Groundwater | IN5237015 | 1 | 0 | |
| PORTLAND MUNICIPAL WATER PLANT Groundwater | IN5238007 | 1 | 0 | |
| CANAAN UTILITIES Groundwater | IN5239001 | 1 | 0 | |
| DUPONT WATER COMPANY Groundwater | IN5240004 | 1 | 0 | |
| NORTH VERNON WATER DEPARTMENT Surface Water | IN5240008 | 1 | 0 | |
| APPLE VALLEY UTILITIES, INC. Groundwater | IN5245001 | 1 | 0 | |
| IN American Water - Lowell GU | IN5245029 | 1 | 0 | |
| ST. JOHN MUNICIPAL WATER UTILITY Groundwater | IN5245043 | 1 | 0 | |
| TWIN LAKES UTILITIES, INC. Groundwater | IN5245046 | 1 | 0 | |
| CEDAR LAKE WATER WORKS Groundwater | IN5245047 | 1 | 0 | |
| LAPORTE WATER WORKS Groundwater | IN5246017 | 1 | 0 | |
| ELWOOD WATER & SEWAGE Groundwater | IN5248007 | 1 | 0 | |
| KENDALLVILLE WATER DEPARTMENT Groundwater | IN5257008 | 1 | 0 | |
| HEBRON WATER DEPARTMENT Groundwater | IN5264009 | 1 | 0 | |
| UNION CITY WATER WORKS Groundwater | IN5268010 | 1 | 0 | |
| BATESVILLE WATER UTILITY Surface Water | IN5269001 | 1 | 0 | |
| NAPOLEON COMMUNITY RURAL WATER CORP. Surface Water | IN5269007 | 1 | 0 | |
| SCOTTSBURG WATER DEPARTMENT Groundwater | IN5272001 | 1 | 0 | |
| INDIANA AMERICAN WATER - SHELBYVILLE Groundwater | IN5273002 | 1 | 0 | |
| LAFAYETTE WATER WORKS, IN Groundwater | IN5279013 | 1 | 0 | |
| INDIANA AMERICAN WATER - WEST LAFAYETTE Groundwater | IN5279020 | 1 | 0 | |
| EVANSVILLE WATER UTILITY Surface Water | IN5282002 | 1 | 0 | |
| GERMAN TOWNSHIP WATER DISTRICT INC. Surface Water | IN5282003 | 1 | 0 | |
| INDIANA AMERICAN WATER - WABASH Groundwater | IN5285003 | 1 | 0 | |
| NEW PEKIN WATER UTILITY Surface Water | IN5288004 | 1 | 0 | |
| POSEY TOWNSHIP WATER CORP. Groundwater | IN5288006 | 1 | 0 | |
| BLUFFTON UTILITIES WATER DEPT Groundwater | IN5290001 | 1 | 0 | |
| COLUMBIA CITY WATER DEPARTMENT Groundwater | IN5292004 | 1 | 0 | |