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EWG's Tap Water Database — 2021 UPDATE

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Largest utilities by state:

Utility name City People served
Altoona Water Supply Altoona Population served: 14,541
Ames Water Treatment Plant Ames Population served: 50,029
Boone Water Works Boone Population served: 12,909
Burlington Municipal Waterworks Burlington Population served: 25,619
Carroll Municipal Water Supply Carroll Population served: 10,103
Cedar Falls Municipal Water Utilities Cedar Falls Population served: 39,260
Cedar Rapids Water Department Cedar Rapids Population served: 128,201
Central IA Water Assn (Waverly) Newton Population served: 34,245
City of Ankeny Ankeny Population served: 54,598
Clive Water Department Clive Population served: 15,447
Coralville Muni Water System Coralville Population served: 18,907
Council Bluffs Water Works Council Bluffs Population served: 63,795
Des Moines Water Works Des Moines Population served: 233,020
Dubuque Water Works Dubuque Population served: 57,637
Fort Dodge Water Supply Fort Dodge Population served: 25,206
Ft Madison Muni Water Works Fort Madison Population served: 11,378
Indianola Water Supply Indianola Population served: 14,782
Iowa City Water Department Iowa City Population served: 63,265
Iowa-American Water Co-Clinton District Clinton Population served: 26,885
Iowa-American Water Company - Davenport Davenport Population served: 137,201
ISU Ames Population served: 31,453
Johnston Municipal Water Supply Johnston Population served: 17,306
Keokuk Municipal Water Works Keokuk Population served: 10,780
Marion Municipal Water Department Marion Population served: 34,610
Marshalltown Water Works Marshalltown Population served: 27,612
Mason City Water Department Mason City Population served: 28,079
Muscatine Power & Water Muscatine Population served: 24,386
Newton Water Supply Newton Population served: 16,262
North Liberty Water Supply North Liberty Population served: 13,386
Oskaloosa Municipal Water Department Oskaloosa Population served: 12,173
Ottumwa Water Works Ottumwa Population served: 25,023
Pella Water Works Department Pella Population served: 10,352
Poweshiek Water Association Tama Population served: 18,836
Rathbun Regional Water Assn Centerville Population served: 28,215
Sioux City Water Supply Sioux City Population served: 82,759
SIRWA #2 (Creston) Creston Population served: 18,510
Spencer Municipal Water Utility Spencer Population served: 11,235
Storm Lake Water Treatment Plant Storm Lake Population served: 10,892
University Water System Iowa City Population served: 26,684
Urbandale Water Utility Urbandale Population served: 39,463
Wapello Rural Water Assoc. Ottumwa Population served: 15,601
Warren Water District Indianola Population served: 18,045
Waterloo Water Works Waterloo Population served: 70,070
Waukee Water Supply Waukee Population served: 13,790
West Des Moines Water Works West Des Moines Population served: 56,609
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