| SIOUX CITY WATER SUPPLY GU | IA9778054 | 10 | 3 | |
| MUSCATINE POWER & WATER Groundwater | IA7048001 | 7 | 2 | |
| WAVERLY WATER DEPARTMENT Groundwater | IA0990085 | 6 | 2 | |
| WATERLOO WATER WORKS Groundwater | IA0790074 | 5 | 1 | |
| WEST BURLINGTON MUNI. WATER SUPPLY Surface Water | IA2985002 | 5 | 1 | |
| DUBUQUE WATER WORKS Groundwater | IA3126052 | 2 | 1 | |
| OSAGE MUNICIPAL WATER SUPPLY Groundwater | IA6663001 | 2 | 1 | |
| IOWA-AMERICAN WTR CO-DAVENPORT Surface Water | IA8222001 | 2 | 1 | |
| IOWA-AMERICAN WTR CO-CLINTON DISTRICT Groundwater | IA2326048 | 6 | 0 | |
| BURLINGTON MUNICIPAL WATERWORKS MX | IA2909053 | 4 | 0 | |
| URBAN BLUFFS - NORTH Surface Water | IA7820701 | 4 | 0 | |
| RATHBUN REG WTR ASSN (BURLINGTON) Surface Water | IA0400902 | 3 | 0 | |
| KEOKUK MUNICIPAL WATER WORKS Surface Water | IA5640019 | 3 | 0 | |
| HIAWATHA WATER DEPT Groundwater | IA5735045 | 3 | 0 | |
| RATHBUN REG WATER ASSN (FT MADISON) Surface Water | IA0400901 | 2 | 0 | |
| IOWA LAKES REGIONAL WATER - LAKES AREA Surface Water | IA3060001 | 2 | 0 | |
| OKOBOJI WATER SUPPLY Surface Water | IA3060091 | 2 | 0 | |
| SPIRIT LAKE WATERWORKS Surface Water | IA3070078 | 2 | 0 | |
| BONDURANT MUNI WATER SUPPLY Surface Water | IA7717032 | 2 | 0 | |
| CARTER LAKE WATER DISTRICT MX | IA7812079 | 2 | 0 | |
| CAMBRIDGE WATER SUPPLY Groundwater | IA8509069 | 2 | 0 | |
| WAPELLO RURAL WATER ASSOC. Surface Water | IA9000742 | 2 | 0 | |
| CENTERVILLE MUNICIPAL WATERWORKS Surface Water | IA0407008 | 1 | 0 | |
| CEDAR FALLS MUNICIPAL WATER UTILITIES Groundwater | IA0709084 | 1 | 0 | |
| BOONE WATER WORKS GU | IA0819033 | 1 | 0 | |
| XENIA RWD (BOONE) GU | IA0844006 | 1 | 0 | |
| IA REGIONAL UTILITIES ASSOC (WAVERLY) Groundwater | IA0990701 | 1 | 0 | |
| STORM LAKE WATER TREATMENT PLANT Groundwater | IA1178097 | 1 | 0 | |
| WEST CENTRAL RWA - NISH SYSTEM Groundwater | IA1400902 | 1 | 0 | |
| WEST CENTRAL RWA-BOYER SYSTEM Groundwater | IA1400903 | 1 | 0 | |
| CARROLL MUNICIPAL WATER SUPPLY Groundwater | IA1415072 | 1 | 0 | |
| ANITA MUNICIPAL UTILITIES Groundwater | IA1503053 | 1 | 0 | |
| ATLANTIC MUNICIPAL UTILITIES Groundwater | IA1509074 | 1 | 0 | |
| CLEAR LAKE WATER DEPARTMENT Groundwater | IA1716076 | 1 | 0 | |
| MASON CITY WATER DEPARTMENT Groundwater | IA1750048 | 1 | 0 | |
| CHEROKEE WATER SUPPLY - PLANT 1 Groundwater | IA1811020 | 1 | 0 | |
| NEW HAMPTON WATER SUPPLY Groundwater | IA1970051 | 1 | 0 | |
| OSCEOLA WATER WORKS Surface Water | IA2038038 | 1 | 0 | |
| SIRWA #3 (OSCEOLA) Surface Water | IA2038701 | 1 | 0 | |
| SPENCER MUNICIPAL WATER UTILITY Groundwater | IA2171071 | 1 | 0 | |
| CAMANCHE WATER SUPPLY Groundwater | IA2322066 | 1 | 0 | |
| DE WITT WATER SUPPLY Groundwater | IA2330036 | 1 | 0 | |
| DENISON WATER SUPPLY Groundwater | IA2424027 | 1 | 0 | |
| PERRY MUNICIPAL WATER WORKS Groundwater | IA2561036 | 1 | 0 | |
| WAUKEE WATER SUPPLY MX | IA2573080 | 1 | 0 | |
| XENIA RWD (DES MOINES) Surface Water | IA2573701 | 1 | 0 | |
| XENIA RWD (WOODWARD) Surface Water | IA2576705 | 1 | 0 | |
| GARDEN GROVE WATER SUPPLY Surface Water | IA2725073 | 1 | 0 | |
| ASBURY MUNICIPAL WATER SYSTEM Groundwater | IA3102001 | 1 | 0 | |
| DYERSVILLE MUNICIPAL WATER CO Groundwater | IA3130091 | 1 | 0 | |
| ESTHERVILLE WATER TREATMENT PLANT Groundwater | IA3218024 | 1 | 0 | |
| OELWEIN MUNICIPAL WATER WORKS Groundwater | IA3353088 | 1 | 0 | |
| HAMPTON MUNI WATER WORKS Groundwater | IA3544024 | 1 | 0 | |
| WEBSTER CITY WATER SUPPLY Groundwater | IA4063094 | 1 | 0 | |
| IOWA FALLS WATER DEPARTMENT Groundwater | IA4260097 | 1 | 0 | |
| MOUNT PLEASANT MUNICIPAL UTILITIES Groundwater | IA4453016 | 1 | 0 | |
| HUMBOLDT MUNICIPAL WATER DEPT GU | IA4641064 | 1 | 0 | |
| MAQUOKETA MUNICIPAL WATER Groundwater | IA4950029 | 1 | 0 | |
| NEWTON WATER SUPPLY Groundwater | IA5059064 | 1 | 0 | |
| FAIRFIELD WATER SUPPLY Groundwater | IA5131033 | 1 | 0 | |
| IOWA CITY MHP LLC Groundwater | IA5200601 | 1 | 0 | |
| CORALVILLE MUNI WATER SYSTEM Groundwater | IA5208071 | 1 | 0 | |
| IOWA CITY WATER DEPARTMENT Surface Water | IA5225079 | 1 | 0 | |
| UNIVERSITY WATER SYSTEM Surface Water | IA5225101 | 1 | 0 | |
| NORTH LIBERTY WATER SUPPLY Groundwater | IA5252072 | 1 | 0 | |
| ANAMOSA MUNICIPAL WATER SUPPLY Groundwater | IA5307048 | 1 | 0 | |
| ALGONA MUNICIPAL UTILITIES Groundwater | IA5502015 | 1 | 0 | |
| BANCROFT WATER SUPPLY Groundwater | IA5507085 | 1 | 0 | |
| MARION MUNICIPAL WATER DEPT Groundwater | IA5751035 | 1 | 0 | |
| MOUNT VERNON WATER SUPPLY Groundwater | IA5758021 | 1 | 0 | |
| CHARITON MUNICIPAL WATER WORKS Surface Water | IA5903011 | 1 | 0 | |
| LYON-SIOUX RWS-BIG SIOUX Groundwater | IA6000755 | 1 | 0 | |
| OSKALOOSA MUNICIPAL WATER DEPT GU | IA6273005 | 1 | 0 | |
| MELCHER-DALLAS WATER SUPPLY Groundwater | IA6300099 | 1 | 0 | |
| KNOXVILLE WATER WORKS Groundwater | IA6342036 | 1 | 0 | |
| MARION CO. RURAL WATER DISTRICT Groundwater | IA6342711 | 1 | 0 | |
| PELLA WATER WORKS DEPARTMENT Groundwater | IA6368033 | 1 | 0 | |
| MARSHALLTOWN WATER WORKS Groundwater | IA6469042 | 1 | 0 | |
| GLENWOOD MUNICIPAL UTILITIES Groundwater | IA6525090 | 1 | 0 | |
| ONAWA MUNICIPAL WATER PLANT Groundwater | IA6739095 | 1 | 0 | |
| ALBIA MUNICIPAL WATER WORKS Surface Water | IA6803010 | 1 | 0 | |
| RED OAK WATER SUPPLY Groundwater | IA6950075 | 1 | 0 | |
| RIVERVIEW SUBDIVISION Groundwater | IA7038301 | 1 | 0 | |
| WEST LIBERTY WATER UTILITY Groundwater | IA7073010 | 1 | 0 | |
| SHELDON WATER DEPARTMENT Groundwater | IA7170040 | 1 | 0 | |
| OSCEOLA RURAL WATER SYSTEM-NORTH Groundwater | IA7227701 | 1 | 0 | |
| CLARINDA WATER PLANT Surface Water | IA7329029 | 1 | 0 | |
| SHENANDOAH WATER DEPT Groundwater | IA7383045 | 1 | 0 | |
| EMMETSBURG MUNICIPAL WATER DEPARTMENT Groundwater | IA7428021 | 1 | 0 | |
| LEMARS WATER DEPARTMENT Groundwater | IA7540174 | 1 | 0 | |
| ALTOONA WATER SUPPLY Groundwater | IA7707030 | 1 | 0 | |
| ANKENY, CITY OF Surface Water | IA7709053 | 1 | 0 | |
| CLIVE WATER DEPARTMENT Surface Water | IA7720051 | 1 | 0 | |
| DES MOINES WATER WORKS Surface Water | IA7727031 | 1 | 0 | |
| GRIMES WATER SUPPLY Groundwater | IA7736011 | 1 | 0 | |
| JOHNSTON MUNICIPAL WATER SUPPLY Surface Water | IA7740011 | 1 | 0 | |
| POLK CITY WATER SUPPLY Surface Water | IA7770050 | 1 | 0 | |
| SOUTHEAST POLK RWD Surface Water | IA7774701 | 1 | 0 | |
| URBANDALE WATER UTILITY Surface Water | IA7780042 | 1 | 0 | |
| WEST DES MOINES WATER WORKS Surface Water | IA7785007 | 1 | 0 | |
| COUNCIL BLUFFS WATER WORKS Groundwater | IA7820080 | 1 | 0 | |
| GRINNELL WATER DEPARTMENT Groundwater | IA7930008 | 1 | 0 | |
| REGIONAL WATER Groundwater | IA8300184 | 1 | 0 | |
| PORTSMOUTH WATER SUPPLY Groundwater | IA8365052 | 1 | 0 | |
| RURAL WATER SYSTEM #1 Groundwater | IA8400722 | 1 | 0 | |
| SOUTHERN SIOUX COUNTY RURAL WATER Groundwater | IA8400733 | 1 | 0 | |
| ORANGE CITY MUNICIPAL WATER DEPARTMENT Groundwater | IA8474097 | 1 | 0 | |
| ROCK VALLEY WATER SUPPLY Groundwater | IA8482096 | 1 | 0 | |
| SIOUX CENTER MUNICIPAL WATER DEPARTMENT Groundwater | IA8486053 | 1 | 0 | |
| AMES WATER TREATMENT PLANT Groundwater | IA8503039 | 1 | 0 | |
| ISU Groundwater | IA8503528 | 1 | 0 | |
| NEVADA WATER SUPPLY Groundwater | IA8562044 | 1 | 0 | |
| IOWA PREMIUM LLC Groundwater | IA8670101 | 1 | 0 | |
| CRESTON WATER SUPPLY Surface Water | IA8816089 | 1 | 0 | |
| OTTUMWA WATER WORKS Surface Water | IA9083012 | 1 | 0 | |
| CARLISLE WATER SUPPLY Groundwater | IA9113071 | 1 | 0 | |
| INDIANOLA WATER SUPPLY Groundwater | IA9133075 | 1 | 0 | |
| WARREN WATER DISTRICT Surface Water | IA9133701 | 1 | 0 | |
| NORWALK WATER SUPPLY Surface Water | IA9164078 | 1 | 0 | |
| WASHINGTON WATER DEPARTMENT Groundwater | IA9271068 | 1 | 0 | |
| XENIA RWD (NORTH) Groundwater | IA9425701 | 1 | 0 | |
| FORT DODGE WATER SUPPLY Groundwater | IA9433050 | 1 | 0 | |
| FOREST CITY WATER SUPPLY Groundwater | IA9525047 | 1 | 0 | |
| DECORAH WATER DEPARTMENT Groundwater | IA9630012 | 1 | 0 | |
| SERGEANT BLUFF WATER SUPPLY Groundwater | IA9774033 | 1 | 0 | |
| WORTH CO INTERCHANGE 214 WATER SUPPLY Groundwater | IA9855202 | 1 | 0 | |
| EAGLE GROVE WATER SUPPLY Groundwater | IA9926096 | 1 | 0 | |