Water Quality in Iowa
1,076 water systems • 593 cities • EPA SDWIS Data
1,076
Water Systems
9,389
Total Violations
934
Health-Based Violations
3,000,306
Population Served
Overview
Iowa ranks 39th among all U.S. states for total drinking water violations, out of 51 states tracked. The state has 9,389 EPA Safe Drinking Water Act violations on record across 1,076 water systems serving 593 cities. Of those, 934 are health-based violations, meaning a regulated contaminant was measured above the EPA-established safe level. Iowa's total violation count is 74% below the national average. Water systems in Iowa serve approximately 3,000,306 people. The most frequently cited contaminants in Iowa violations include E. coli, Fecal Coliform, Contaminant 1009, Nitrate, Total Organic Carbon.
Cities with Most Violations in Iowa
| # | City | Violations | Health-Based | Water Systems | Population |
|---|---|---|---|---|---|
| 1 | Muscatine | 431 | 4 | 24 | 29,914 |
| 2 | Cedar Rapids | 426 | 7 | 15 | 143,238 |
| 3 | Oxford | 295 | 61 | 27 | 4,176 |
| 4 | Dubuque | 222 | 1 | 12 | 60,492 |
| 5 | Centerville | 196 | 0 | 5 | 60,024 |
| 6 | Walford | 164 | 8 | 4 | 591 |
| 7 | Fort Dodge | 154 | 73 | 19 | 29,432 |
| 8 | Plymouth | 136 | 0 | 1 | 378 |
| 9 | Marshalltown | 132 | 22 | 15 | 34,613 |
| 10 | Jesup | 131 | 0 | 3 | 3,389 |
Largest Cities in Iowa
| # | City | Population | Violations | Water Systems |
|---|---|---|---|---|
| 1 | Des Moines | 254,814 | 36 | 6 |
| 2 | Davenport | 149,541 | 37 | 13 |
| 3 | Cedar Rapids | 143,238 | 426 | 15 |
| 4 | Ames | 97,467 | 14 | 4 |
| 5 | Iowa City | 97,293 | 79 | 16 |
| 6 | Sioux City | 85,824 | 21 | 2 |
| 7 | Ankeny | 80,663 | 26 | 10 |
| 8 | Waterloo | 69,892 | 5 | 2 |
| 9 | West Des Moines | 68,748 | 0 | 2 |
| 10 | Newton | 66,010 | 70 | 24 |
All Cities in Iowa
| City | Population | Violations | Health Violations | Contaminants |
|---|---|---|---|---|
| Des Moines | 254,814 | 36 | 2 | Fecal Coliform |
| Davenport | 149,541 | 37 | 0 | |
| Cedar Rapids | 143,238 | 426 | 7 | Chlorine, Chlorine Dioxide, Contaminant 1041 +1 more |
| Ames | 97,467 | 14 | 0 | |
| Iowa City | 97,293 | 79 | 13 | Chlorine Dioxide, E. coli, TTHM +1 more |
| Sioux City | 85,824 | 21 | 10 | Contaminant 2257, TTHM |
| Ankeny | 80,663 | 26 | 0 | |
| Waterloo | 69,892 | 5 | 2 | Selenium |
| West Des Moines | 68,748 | 0 | 0 | |
| Newton | 66,010 | 70 | 0 | |
| Council Bluffs | 64,447 | 1 | 0 | |
| Dubuque | 60,492 | 222 | 1 | Chlorine Dioxide |
| Centerville | 60,024 | 196 | 0 | |
| Urbandale | 45,605 | 1 | 0 | |
| Ottumwa | 42,942 | 16 | 0 | |
| Marion | 42,861 | 1 | 1 | Total Organic Carbon |
| Cedar Falls | 40,951 | 9 | 0 | |
| Creston | 38,079 | 13 | 2 | Contaminant 2257 |
| Indianola | 35,928 | 4 | 0 | |
| Marshalltown | 34,613 | 132 | 22 | Selenium |
| Waukee | 31,823 | 1 | 0 | |
| Muscatine | 29,914 | 431 | 4 | Chlorine Dioxide, Selenium |
| Fort Dodge | 29,432 | 154 | 73 | Barium, Contaminant 1041, E. coli +1 more |
| Bouton | 29,382 | 39 | 5 | TTHM |
| Mason City | 27,338 | 8 | 0 | |
| Spencer | 27,098 | 2 | 0 | |
| Burlington | 26,205 | 3 | 2 | Fecal Coliform |
| Johnston | 25,233 | 36 | 0 | |
| Clinton | 25,019 | 1 | 0 | |
| Oskaloosa | 24,586 | 20 | 2 | E. coli |
| Coralville | 22,378 | 7 | 0 | |
| Tama | 21,540 | 8 | 0 | |
| North Liberty | 20,546 | 2 | 0 | |
| Altoona | 19,565 | 15 | 3 | HAA5 |
| Clive | 19,010 | 0 | 0 | |
| Grimes | 15,580 | 5 | 0 | |
| Knoxville | 15,173 | 7 | 0 | |
| Norwalk | 14,334 | 0 | 0 | |
| Grinnell | 13,192 | 102 | 36 | Disinfection Byproducts, E. coli, HAA5 +1 more |
| Storm Lake | 13,166 | 9 | 0 | |
| Boone | 12,704 | 8 | 7 | E. coli, Fecal Coliform |
| Clarinda | 12,253 | 9 | 1 | Selenium |
| Pella | 11,289 | 4 | 0 | |
| Fort Madison | 11,087 | 1 | 0 | |
| Lemars | 10,571 | 0 | 0 | |
| Waverly | 10,519 | 5 | 0 | |
| Fairfield | 10,289 | 9 | 0 | |
| Carroll | 10,184 | 1 | 0 | |
| Cherokee | 9,965 | 0 | 0 | |
| Keokuk | 9,900 | 0 | 0 | |
| Bondurant | 9,393 | 0 | 0 | |
| Denison | 9,381 | 0 | 0 | |
| Eldridge | 9,288 | 30 | 1 | Barium |
| Mount Pleasant | 9,274 | 3 | 0 | |
| May City | 9,114 | 2 | 0 | |
| Manning | 9,108 | 6 | 0 | |
| Decorah | 8,390 | 0 | 0 | |
| Sioux Center | 8,231 | 4 | 0 | |
| Washington | 8,187 | 20 | 0 | |
| Perry | 7,836 | 0 | 0 | |
| Webster City | 7,825 | 2 | 0 | |
| Clear Lake | 7,737 | 2 | 0 | |
| Rock Rapids | 7,698 | 7 | 0 | |
| Charles City | 7,446 | 10 | 0 | |
| Adel | 7,421 | 22 | 1 | Lead |
| Avoca | 7,387 | 11 | 3 | Chlorine Dioxide |
| Hiawatha | 7,255 | 12 | 0 | |
| Atlantic | 7,252 | 1 | 0 | |
| Maquoketa | 7,071 | 4 | 1 | Chlorine Dioxide |
| Nevada | 6,925 | 1 | 0 | |
| Polk City | 6,558 | 0 | 0 | |
| Glenwood | 6,307 | 5 | 0 | |
| Rock Valley | 6,289 | 10 | 3 | Chlorine Dioxide |
| Orange City | 6,267 | 1 | 0 | |
| Independence | 6,220 | 0 | 0 | |
| Spirit Lake | 6,167 | 3 | 3 | Fecal Coliform |
| Oelwein | 6,062 | 2 | 0 | |
| Ireton | 6,010 | 0 | 0 | |
| Asbury | 5,943 | 0 | 0 | |
| Estherville | 5,904 | 0 | 0 | |
| Dewitt | 5,792 | 14 | 0 | |
| Anamosa | 5,785 | 12 | 2 | |
| Red Oak | 5,596 | 13 | 0 | |
| Sheldon | 5,512 | 0 | 0 | |
| Osceola | 5,503 | 18 | 13 | Bromate, Contaminant 2257, Fecal Coliform |
| Algona | 5,487 | 1 | 0 | |
| Winterset | 5,428 | 2 | 2 | Bromate |
| Iowa Falls | 5,231 | 22 | 0 | |
| Shenandoah | 5,101 | 5 | 1 | TTHM |
| Vinton | 5,100 | 1 | 0 | |
| Manchester | 5,077 | 0 | 0 | |
| Harlan | 5,067 | 0 | 0 | |
| Sergeant Bluff | 5,015 | 1 | 0 | |
| Hampton | 4,921 | 4 | 0 | |
| Humboldt | 4,897 | 21 | 0 | |
| Camanche | 4,570 | 37 | 0 | |
| Evansdale | 4,561 | 5 | 0 | |
| Madrid | 4,530 | 27 | 9 | Chlorine, Contaminant 2257, Fecal Coliform |
| Mount Vernon | 4,527 | 1 | 0 | |
| Tiffin | 4,512 | 1 | 0 | |
| Dyersville | 4,477 | 21 | 16 | Total Organic Carbon |
| West Burlington | 4,440 | 3 | 0 | |
| Solon | 4,398 | 93 | 1 | Disinfection Byproducts |
| Chariton | 4,381 | 110 | 82 | Chlorine, E. coli, Fecal Coliform +1 more |
| Tipton | 4,294 | 86 | 23 | Barium |
| Forest City | 4,285 | 1 | 0 | |
| Huxley | 4,244 | 0 | 0 | |
| Jefferson | 4,182 | 3 | 0 | |
| Oxford | 4,176 | 295 | 61 | Barium, Chlorine Dioxide, E. coli +1 more |
| Carlisle | 4,170 | 10 | 0 | |
| Hospers | 4,146 | 12 | 2 | Chlorine Dioxide |
| Monticello | 4,121 | 2 | 0 | |
| Milford | 4,037 | 64 | 0 | |
| Panora | 3,991 | 11 | 0 | |
| Waukon | 3,982 | 9 | 0 | |
| Cresco | 3,913 | 0 | 0 | |
| West Liberty | 3,858 | 0 | 0 | |
| Carter Lake | 3,791 | 29 | 0 | |
| Emmetsburg | 3,733 | 5 | 0 | |
| Albia | 3,721 | 0 | 0 | |
| Osage | 3,637 | 1 | 0 | |
| Eagle Grove | 3,601 | 3 | 0 | |
| New Hampton | 3,494 | 4 | 0 | |
| Belle Plaine | 3,484 | 48 | 0 | |
| Jesup | 3,389 | 131 | 0 | |
| Sibley | 3,359 | 3 | 0 | |
| Story City | 3,357 | 8 | 0 | |
| Williamsburg | 3,345 | 5 | 0 | |
| Montezuma | 3,295 | 1 | 0 | |
| Epworth | 3,255 | 3 | 0 | |
| Manly | 3,213 | 53 | 0 | |
| Garner | 3,065 | 0 | 0 | |
| Missouri Valley | 2,939 | 82 | 1 | Chlorine Dioxide |
| Wilton | 2,924 | 0 | 0 | |
| Onawa | 2,906 | 0 | 0 | |
| Sigourney | 2,875 | 5 | 0 | |
| Belmond | 2,863 | 2 | 0 | |
| Kalona | 2,857 | 10 | 1 | Barium |
| Fairfax | 2,853 | 19 | 0 | |
| Clarion | 2,810 | 2 | 0 | |
| Grundy Center | 2,796 | 0 | 0 | |
| Peosta | 2,793 | 15 | 0 | |
| Hawarden | 2,700 | 4 | 0 | |
| Bloomfield | 2,682 | 2 | 0 | |
| Eldora | 2,664 | 0 | 0 | |
| Ogden | 2,659 | 2 | 0 | |
| Center Point | 2,579 | 0 | 0 | |
| Rockwell City | 2,550 | 10 | 2 | |
| Hudson | 2,546 | 0 | 0 | |
| West Union | 2,540 | 0 | 0 | |
| Mitchellville | 2,515 | 12 | 2 | Chlorine |
| Postville | 2,513 | 7 | 0 | |
| West Branch | 2,509 | 7 | 0 | |
| Marengo | 2,481 | 39 | 35 | Selenium |
| Denver | 2,467 | 24 | 0 | |
| Gladbrook | 2,461 | 8 | 0 | |
| Toledo | 2,399 | 17 | 6 | Total Organic Carbon |
| Cascade | 2,386 | 1 | 0 | |
| Whittemore | 2,386 | 61 | 7 | Barium |
| Hull | 2,384 | 0 | 0 | |
| Lake Mills | 2,366 | 1 | 0 | |
| Bellevue | 2,363 | 5 | 5 | Total Organic Carbon |
| Ely | 2,328 | 1 | 0 | |
| Colfax | 2,305 | 1 | 0 | |
| Lisbon | 2,293 | 8 | 0 | |
| Laporte City | 2,284 | 8 | 0 | |
| Greenfield | 2,227 | 6 | 2 | E. coli |
| Adair | 2,120 | 55 | 0 | |
| Lamoni | 2,104 | 30 | 6 | Fecal Coliform, TTHM |
| Wapello | 2,096 | 4 | 0 | |
| Alta | 2,087 | 0 | 0 | |
| Northwood | 2,072 | 1 | 0 | |
| Britt | 2,064 | 5 | 0 | |
| Sac City | 2,063 | 0 | 0 | |
| Mechanicsville | 2,059 | 18 | 0 | |
| Atkins | 2,056 | 8 | 3 | TTHM |
| Audubon | 2,053 | 0 | 0 | |
| Ida Grove | 2,051 | 0 | 0 | |
| Woodward | 2,046 | 21 | 5 | Barium, TTHM |
| Sumner | 2,030 | 0 | 0 | |
| Parkersburg | 2,019 | 0 | 0 | |
| Monroe | 2,007 | 0 | 0 | |
| Mount Ayr | 1,930 | 30 | 0 | |
| Traer | 1,927 | 6 | 0 | |
| Newell | 1,923 | 32 | 0 | |
| Van Horne | 1,919 | 23 | 2 | Contaminant 1041 |
| New London | 1,910 | 3 | 0 | |
| Pocahontas | 1,905 | 3 | 0 | |
| Dallas Center | 1,901 | 4 | 0 | |
| Durant | 1,871 | 0 | 0 | |
| Monona | 1,853 | 3 | 0 | |
| Leon | 1,830 | 33 | 22 | Fecal Coliform, TTHM, Total Haloacetic Acids (HAA5) |
| Columbus Junction | 1,830 | 6 | 0 | |
| Guttenberg | 1,817 | 0 | 0 | |
| Stuart | 1,814 | 0 | 0 | |
| Remsen | 1,770 | 6 | 0 | |
| Farley | 1,766 | 4 | 1 | Total Organic Carbon |
| Moville | 1,757 | 2 | 0 | |
| Leclaire | 1,742 | 59 | 0 | |
| Corning | 1,735 | 8 | 4 | Contaminant 1009, Fecal Coliform |
| Lake City | 1,731 | 8 | 0 | |
| Manson | 1,709 | 4 | 0 | |
| Prairie City | 1,703 | 0 | 0 | |
| Mediapolis | 1,688 | 0 | 0 | |
| Logan | 1,677 | 6 | 0 | |
| Pleasantville | 1,676 | 1 | 1 | HAA5 |
| Riceville | 1,654 | 25 | 0 | |
| Granger | 1,654 | 12 | 0 | |
| Batavia | 1,631 | 20 | 0 | |
| Woodbine | 1,622 | 6 | 0 | |
| Urbana | 1,619 | 45 | 0 | |
| Corydon | 1,610 | 8 | 0 | |
| Hartley | 1,605 | 0 | 0 | |
| State Center | 1,598 | 17 | 0 | |
| Guthrie Center | 1,593 | 0 | 0 | |
| Wyoming | 1,574 | 29 | 0 | |
| Akron | 1,558 | 2 | 0 | |
| Nashua | 1,551 | 18 | 0 | |
| Walcott | 1,551 | 5 | 0 | |
| Amana | 1,548 | 8 | 1 | Selenium |
| Slater | 1,548 | 10 | 3 | Contaminant 1041 |
| Oakland | 1,524 | 2 | 0 | |
| Wellman | 1,524 | 8 | 0 | |
| Bedford | 1,508 | 5 | 0 | |
| Brooklyn | 1,505 | 0 | 0 | |
| Holstein | 1,501 | 0 | 0 | |
| Earlham | 1,446 | 1 | 0 | |
| Palo | 1,407 | 8 | 0 | |
| Kingsley | 1,396 | 0 | 0 | |
| Roland | 1,394 | 0 | 0 | |
| Sanborn | 1,392 | 31 | 0 | |
| Lenox | 1,339 | 2 | 0 | |
| Dike | 1,306 | 2 | 0 | |
| Lowden | 1,304 | 11 | 0 | |
| Laurens | 1,301 | 4 | 0 | |
| Coon Rapids | 1,300 | 0 | 0 | |
| Dysart | 1,281 | 2 | 0 | |
| Shell Rock | 1,269 | 0 | 0 | |
| Central City | 1,264 | 1 | 0 | |
| Fayette | 1,256 | 1 | 0 | |
| Gilmore City | 1,249 | 26 | 2 | Selenium |
| Springville | 1,249 | 3 | 0 | |
| Alton | 1,248 | 1 | 0 | |
| Glidden | 1,232 | 8 | 0 | |
| Elkader | 1,219 | 1 | 0 | |
| Jewell | 1,216 | 6 | 0 | |
| Melcher Dallas | 1,213 | 2 | 0 | |
| Gilbert | 1,211 | 106 | 0 | |
| Colo | 1,206 | 14 | 0 | |
| Tripoli | 1,191 | 0 | 0 | |
| Tabor | 1,181 | 12 | 0 | |
| Blue Grass | 1,179 | 114 | 0 | |
| Buffalo | 1,176 | 4 | 0 | |
| Fredericksburg | 1,170 | 11 | 2 | Disinfection Byproducts |
| Lake Park | 1,167 | 0 | 0 | |
| St. Ansgar | 1,161 | 7 | 0 | |
| Strawberry Point | 1,155 | 0 | 0 | |
| Brighton | 1,142 | 22 | 0 | |
| Lake View | 1,133 | 17 | 2 | |
| Villisca | 1,132 | 3 | 0 | |
| Sheffield | 1,130 | 1 | 0 | |
| Aplington | 1,126 | 1 | 1 | Contaminant 1041 |
| Calmar | 1,125 | 0 | 0 | |
| Mapleton | 1,124 | 4 | 0 | |
| Fairbank | 1,111 | 6 | 5 | Total Organic Carbon |
| Arnolds Park | 1,110 | 0 | 0 | |
| Ossian | 1,110 | 5 | 0 | |
| Conrad | 1,098 | 0 | 0 | |
| Marcus | 1,079 | 3 | 0 | |
| Sidney | 1,077 | 9 | 0 | |
| George | 1,077 | 0 | 0 | |
| Van Meter | 1,074 | 1 | 0 | |
| Rockwell | 1,071 | 6 | 0 | |
| Elk Run Heights | 1,069 | 2 | 0 | |
| North English | 1,065 | 3 | 0 | |
| Riverside | 1,060 | 5 | 0 | |
| Treynor | 1,049 | 8 | 0 | |
| Malvern | 1,046 | 11 | 1 | Selenium |
| Sloan | 1,042 | 0 | 0 | |
| Dunlap | 1,035 | 6 | 0 | |
| Winfield | 1,035 | 1 | 0 | |
| Janesville | 1,034 | 0 | 0 | |
| Griswold | 1,008 | 8 | 0 | |
| Baxter | 1,002 | 15 | 0 | |
| Paullina | 996 | 12 | 0 | |
| Greene | 994 | 3 | 0 | |
| Odebolt | 994 | 0 | 0 | |
| Lansing | 983 | 1 | 1 | Total Organic Carbon |
| Long Grove | 976 | 3 | 0 | |
| Anita | 972 | 5 | 0 | |
| Aurelia | 968 | 0 | 0 | |
| Allison | 966 | 1 | 0 | |
| Wayland | 966 | 2 | 0 | |
| Shellsburg | 961 | 1 | 0 | |
| Keosauqua | 961 | 12 | 0 | |
| Gowrie | 954 | 0 | 0 | |
| Preston | 949 | 3 | 0 | |
| Lawton | 943 | 6 | 0 | |
| Edgewood | 939 | 2 | 0 | |
| Hinton | 935 | 7 | 0 | |
| Inwood | 928 | 1 | 0 | |
| Larchwood | 926 | 1 | 0 | |
| Princeton | 923 | 6 | 3 | Selenium |
| West Point | 921 | 6 | 0 | |
| Sioux Rapids | 920 | 8 | 0 | |
| Legrand | 910 | 1 | 0 | |
| Carson | 910 | 6 | 0 | |
| Keota | 897 | 3 | 0 | |
| Graettinger | 897 | 0 | 0 | |
| Primghar | 896 | 3 | 0 | |
| Hamburg | 890 | 12 | 0 | |
| Donnellson | 885 | 28 | 12 | HAA5, Total Organic Carbon |
| Sully | 881 | 1 | 0 | |
| Armstrong | 875 | 9 | 1 | Disinfection Byproducts |
| Hills | 863 | 2 | 0 | |
| Hubbard | 860 | 0 | 0 | |
| Maxwell | 859 | 7 | 0 | |
| Readlyn | 845 | 0 | 0 | |
| Dunkerton | 842 | 1 | 0 | |
| Winthrop | 840 | 1 | 0 | |
| Cambridge | 832 | 0 | 0 | |
| West Bend | 822 | 3 | 0 | |
| Calamus | 809 | 16 | 1 | Total Organic Carbon |
| Schleswig | 803 | 3 | 0 | |
| Gilbertville | 794 | 4 | 0 | |
| Okoboji | 793 | 2 | 0 | |
| Milo | 788 | 7 | 0 | |
| Wall Lake | 780 | 2 | 2 | Selenium |
| Ruthven | 779 | 0 | 0 | |
| Wheatland | 775 | 3 | 2 | Contaminant 1041 |
| Salem | 769 | 22 | 0 | |
| Dakota City | 769 | 0 | 0 | |
| Walnut | 768 | 0 | 0 | |
| Correctionville | 766 | 0 | 0 | |
| Melbourne | 765 | 0 | 0 | |
| Exira | 764 | 6 | 2 | Chlorine Dioxide |
| Garnavillo | 763 | 3 | 0 | |
| Alden | 763 | 1 | 0 | |
| Rockford | 762 | 0 | 0 | |
| Manilla | 758 | 5 | 0 | |
| Morning Sun | 752 | 0 | 0 | |
| Mcgregor | 747 | 3 | 0 | |
| Redfield | 744 | 0 | 0 | |
| Blairstown | 738 | 3 | 3 | Contaminant 1041 |
| Montrose | 738 | 4 | 1 | Fecal Coliform |
| Schaller | 729 | 3 | 2 | Chlorine Dioxide |
| Hedrick | 728 | 6 | 0 | |
| Whiting | 727 | 0 | 0 | |
| Shelby | 727 | 6 | 0 | |
| Grand Junction | 725 | 9 | 0 | |
| Earlville | 724 | 2 | 0 | |
| Essex | 722 | 2 | 0 | |
| Wellsburg | 721 | 0 | 0 | |
| Merrill | 717 | 25 | 0 | |
| Ventura | 716 | 2 | 0 | |
| Bancroft | 711 | 0 | 0 | |
| Stratford | 707 | 6 | 0 | |
| Phoenix | 702 | 0 | 0 | |
| Coggon | 701 | 52 | 0 | |
| Boyden | 701 | 1 | 0 | |
| Lakeside | 700 | 0 | 0 | |
| Battle Creek | 700 | 1 | 0 | |
| Dexter | 693 | 2 | 0 | |
| Ellsworth | 691 | 3 | 0 | |
| Walker | 688 | 1 | 0 | |
| Elgin | 685 | 1 | 0 | |
| Murray | 684 | 0 | 0 | |
| Alburnett | 675 | 5 | 0 | |
| Pomeroy | 671 | 11 | 1 | Contaminant 1041 |
| Fontanelle | 670 | 0 | 0 | |
| Kanawha | 658 | 0 | 0 | |
| Milton | 644 | 8 | 0 | |
| Moravia | 637 | 10 | 0 | |
| Stanwood | 637 | 0 | 0 | |
| Seymour | 637 | 0 | 0 | |
| Fonda | 636 | 5 | 0 | |
| Goldfield | 634 | 0 | 0 | |
| Elk Horn | 631 | 19 | 0 | |
| Sutherland | 629 | 2 | 0 | |
| Hopkinton | 622 | 1 | 0 | |
| Agency | 620 | 0 | 0 | |
| Doon | 619 | 6 | 0 | |
| Kellogg | 617 | 9 | 0 | |
| Grand Mound | 615 | 1 | 0 | |
| Spillville | 614 | 0 | 0 | |
| Allerton | 609 | 9 | 0 | |
| Moulton | 607 | 0 | 0 | |
| Farmington | 601 | 10 | 0 | |
| Keystone | 599 | 9 | 4 | Chlorine Dioxide, Contaminant 1041 |
| Neola | 598 | 13 | 0 | |
| Walford | 591 | 164 | 8 | Barium |
| Early | 587 | 11 | 11 | Selenium |
| Clermont | 586 | 3 | 0 | |
| South English | 586 | 15 | 0 | |
| Olds | 584 | 10 | 0 | |
| Swea City | 584 | 0 | 0 | |
| Everly | 575 | 1 | 0 | |
| Radcliffe | 561 | 2 | 0 | |
| Badger | 561 | 0 | 0 | |
| Leland | 553 | 20 | 3 | Contaminant 1041 |
| Anthon | 545 | 3 | 0 | |
| Zearing | 528 | 28 | 3 | Contaminant 2257, E. coli |
| Dows | 526 | 2 | 0 | |
| Arcadia | 525 | 3 | 0 | |
| Charter Oak | 522 | 4 | 0 | |
| Miles | 517 | 13 | 0 | |
| Titonka | 511 | 5 | 0 | |
| Ainsworth | 511 | 9 | 0 | |
| Delhi | 509 | 8 | 0 | |
| Rolfe | 509 | 2 | 0 | |
| Sabula | 506 | 27 | 0 | |
| Elma | 505 | 1 | 0 | |
| Collins | 505 | 0 | 0 | |
| Scranton | 504 | 19 | 0 | |
| Breda | 500 | 7 | 0 | |
| Thompson | 499 | 1 | 0 | |
| New Virginia | 498 | 1 | 0 | |
| Farragut | 490 | 0 | 0 | |
| Garwin | 481 | 0 | 0 | |
| Russell | 477 | 15 | 0 | |
| Maynard | 476 | 0 | 0 | |
| Lovilia | 472 | 0 | 0 | |
| Dow City | 467 | 10 | 2 | Selenium |
| Norway | 466 | 11 | 0 | |
| Stacyville | 465 | 4 | 0 | |
| Humeston | 462 | 27 | 0 | |
| Cascasde | 455 | 15 | 2 | Chlorine Dioxide |
| Klemme | 441 | 6 | 0 | |
| Little Rock | 441 | 1 | 1 | Disinfection Byproducts |
| Ocheyedan | 439 | 2 | 0 | |
| Hawkeye | 438 | 0 | 0 | |
| Grandview | 437 | 26 | 0 | |
| Ashton | 436 | 4 | 0 | |
| Galva | 435 | 1 | 0 | |
| Lost Nation | 434 | 40 | 0 | |
| New Albin | 432 | 1 | 0 | |
| Lamont | 429 | 3 | 0 | |
| Marquette | 429 | 3 | 3 | Total Organic Carbon |
| Oxford Junction | 424 | 5 | 0 | |
| Martensdale | 421 | 0 | 0 | |
| Arlington | 419 | 1 | 0 | |
| Burt | 418 | 0 | 0 | |
| Panama | 417 | 0 | 0 | |
| Emerson | 412 | 2 | 0 | |
| Lawler | 406 | 8 | 2 | Contaminant 1041 |
| Earling | 397 | 2 | 0 | |
| Plainfield | 393 | 0 | 0 | |
| Wesley | 390 | 0 | 0 | |
| Washinginton | 390 | 3 | 0 | |
| Casey | 387 | 0 | 0 | |
| Colesburg | 386 | 0 | 0 | |
| New Market | 385 | 5 | 3 | Total Haloacetic Acids (HAA5) |
| Duncombe | 384 | 0 | 0 | |
| Vail | 383 | 3 | 0 | |
| Livermore | 383 | 7 | 1 | Disinfection Byproducts |
| New Vienna | 382 | 4 | 0 | |
| Worthington | 382 | 1 | 0 | |
| Lynnville | 380 | 1 | 0 | |
| Plymouth | 378 | 136 | 0 | |
| Churdan | 375 | 7 | 0 | |
| Orient | 368 | 1 | 0 | |
| Birmingham | 367 | 6 | 0 | |
| Ringsted | 365 | 3 | 0 | |
| Massena | 364 | 41 | 6 | Barium, Chlorine Dioxide |
| Stanhope | 364 | 8 | 0 | |
| Lacona | 361 | 2 | 0 | |
| Rudd | 358 | 0 | 0 | |
| Lewis | 357 | 4 | 2 | Selenium |
| Holy Cross | 356 | 5 | 0 | |
| Templeton | 352 | 0 | 0 | |
| Ryan | 350 | 14 | 1 | Contaminant 1041 |
| Pleasant Hill | 350 | 10 | 0 | |
| Fort Atkinson | 347 | 0 | 0 | |
| Elliott | 345 | 12 | 0 | |
| Brandon | 341 | 6 | 0 | |
| Ute | 338 | 4 | 0 | |
| Diagonal | 338 | 30 | 0 | |
| Pierson | 337 | 2 | 0 | |
| Middletown | 336 | 6 | 0 | |
| Terril | 334 | 4 | 0 | |
| Mystic | 322 | 8 | 0 | |
| Peterson | 322 | 0 | 0 | |
| Danbury | 320 | 2 | 2 | Selenium |
| Williams | 315 | 8 | 0 | |
| Floyd | 313 | 4 | 1 | Endrin |
| Irwin | 313 | 12 | 0 | |
| Vincent | 311 | 8 | 0 | |
| Granville | 310 | 0 | 0 | |
| Sheldahl | 307 | 16 | 4 | Contaminant 1041 |
| Fertile | 306 | 31 | 0 | |
| Blakesburg | 305 | 4 | 0 | |
| Bode | 304 | 0 | 0 | |
| Kelley | 304 | 0 | 0 | |
| Luana | 301 | 3 | 0 | |
| Lester | 296 | 2 | 0 | |
| Salix | 295 | 1 | 0 | |
| Bronson | 294 | 3 | 0 | |
| Cincinnati | 290 | 3 | 0 | |
| Kimballton | 287 | 18 | 0 | |
| Alta Vista | 282 | 3 | 0 | |
| Lytton | 282 | 2 | 0 | |
| Westside | 277 | 10 | 0 | |
| Macedonia | 275 | 1 | 0 | |
| Ridgeway | 275 | 2 | 0 | |
| Marble Rock | 272 | 1 | 0 | |
| Rhodes | 271 | 1 | 0 | |
| Malcom | 270 | 0 | 0 | |
| Protivin | 269 | 2 | 0 | |
| Yale | 267 | 0 | 0 | |
| Cumberland | 266 | 0 | 0 | |
| Corwith | 266 | 3 | 0 | |
| Auburn | 265 | 2 | 0 | |
| Maurice | 265 | 0 | 0 | |
| Steamboat Rock | 264 | 111 | 0 | |
| Lu Verne | 258 | 6 | 0 | |
| Kiron | 257 | 3 | 0 | |
| Mallard | 257 | 65 | 52 | Barium |
| Kensett | 257 | 2 | 0 | |
| Hornick | 255 | 0 | 0 | |
| Fenton | 254 | 0 | 0 | |
| Deloit | 250 | 10 | 0 | |
| Riverton | 250 | 14 | 0 | |
| Defiance | 250 | 23 | 0 | |
| Lineville | 250 | 2 | 0 | |
| Quimby | 249 | 3 | 0 | |
| Deep River | 249 | 1 | 0 | |
| Luxemburg | 245 | 0 | 0 | |
| Pisgah | 245 | 0 | 0 | |
| Los Angeles | 245 | 11 | 0 | |
| Halbur | 243 | 1 | 0 | |
| Kansas City | 240 | 17 | 0 | |
| Goose Lake | 239 | 5 | 0 | |
| Boca Raton | 236 | 11 | 0 | |
| Harvey | 236 | 4 | 0 | |
| De Soto | 235 | 1 | 0 | |
| Renwick | 234 | 0 | 0 | |
| Marathon | 230 | 1 | 0 | |
| Chelsea | 229 | 17 | 0 | |
| Blencoe | 224 | 1 | 0 | |
| Cantril | 224 | 6 | 0 | |
| Dedham | 221 | 97 | 16 | Arsenic |
| Laurel | 220 | 0 | 0 | |
| Coulter | 219 | 8 | 0 | |
| Grafton | 218 | 0 | 0 | |
| Clutier | 213 | 1 | 0 | |
| Washta | 209 | 0 | 0 | |
| Wadena | 209 | 2 | 1 | Chlorine Dioxide |
| Alvord | 206 | 0 | 0 | |
| Hanlontown | 206 | 9 | 0 | |
| Volga | 203 | 2 | 0 | |
| Montour | 203 | 0 | 0 | |
| Swisher | 201 | 2 | 0 | |
| Oakville | 200 | 10 | 0 | |
| Hancock | 200 | 1 | 0 | |
| Jamaica | 195 | 47 | 5 | Contaminant 1041 |
| Westgate | 192 | 1 | 0 | |
| Stout | 191 | 4 | 0 | |
| Moorhead | 189 | 8 | 0 | |
| Woden | 188 | 20 | 0 | |
| Magnolia | 188 | 4 | 0 | |
| Smithland | 181 | 0 | 0 | |
| Soldier | 180 | 20 | 0 | |
| Pilot Mound | 176 | 0 | 0 | |
| Wallingford | 170 | 6 | 0 | |
| Lidderdale | 166 | 5 | 0 | |
| Little Sioux | 166 | 13 | 1 | Barium |
| Linn Grove | 163 | 7 | 0 | |
| Beaman | 161 | 2 | 0 | |
| Prairieburg | 160 | 1 | 0 | |
| Shambaugh | 159 | 1 | 1 | TTHM |
| Barnes City | 156 | 8 | 0 | |
| Randall | 154 | 0 | 0 | |
| Braddyville | 147 | 2 | 0 | |
| Bristow | 145 | 9 | 9 | Selenium |
| West Chester | 144 | 2 | 0 | |
| Woolstock | 144 | 2 | 0 | |
| Brayton | 143 | 3 | 0 | |
| Springbrook | 143 | 2 | 0 | |
| Goodell | 140 | 3 | 0 | |
| Clemons | 140 | 0 | 0 | |
| Palmer | 138 | 3 | 0 | |
| Geneva | 136 | 0 | 0 | |
| Ft Dodge | 136 | 0 | 0 | |
| Millersburg | 135 | 2 | 0 | |
| Superior | 132 | 3 | 0 | |
| Monmouth | 129 | 55 | 0 | |
| Somers | 128 | 4 | 0 | |
| Maharishi Vedic City | 128 | 43 | 0 | |
| Pacific Junction | 125 | 13 | 1 | Barium |
| Saint Charles | 121 | 3 | 0 | |
| Dawson | 116 | 20 | 0 | |
| Bernard | 114 | 0 | 0 | |
| Castana | 103 | 67 | 0 |
Water Quality in Other States
Alabama 13,972 violations Alaska 73,527 violations Arizona 60,414 violations Arkansas 17,031 violations California 39,276 violations Colorado 42,596 violations Connecticut 28,800 violations Delaware 1,242 violations District of Columbia 115 violations Florida 36,335 violations Georgia 32,159 violations Hawaii 182 violations Idaho 26,078 violations Illinois 30,544 violations Indiana 18,261 violations Kansas 19,480 violations Kentucky 9,427 violations Louisiana 32,039 violations Maine 6,830 violations Maryland 5,321 violations Massachusetts 10,561 violations Michigan 15,820 violations Minnesota 3,784 violations Mississippi 25,296 violations Missouri 25,377 violations Montana 20,202 violations Nebraska 5,134 violations Nevada 8,167 violations New Hampshire 6,968 violations New Jersey 19,332 violations New Mexico 37,115 violations New York 93,834 violations North Carolina 54,399 violations North Dakota 8,431 violations Ohio 61,604 violations Oklahoma 128,472 violations Oregon 0 violations Pennsylvania 199,265 violations Rhode Island 0 violations South Carolina 13,045 violations South Dakota 19,565 violations Tennessee 20,607 violations Texas 263,180 violations Utah 71,655 violations Vermont 12,362 violations Virginia 15,298 violations Washington 54,459 violations West Virginia 81,622 violations Wisconsin 18,533 violations Wyoming 13,783 violations
Data Sources
Drinking water data from the EPA Safe Drinking Water Information System (SDWIS). Only active community water systems (CWS) serving 100+ people are included.