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Iowa Water Quality Report

436 cities tested · Average grade: A- · 2.9M people served

Cities Tested
436
Avg Score
87.5
Population Served
2.9M
Avg Grade
A-
Live Water Alerts for Iowa →
Latest News

Latest water news in Iowa

Recent reporting on Iowa drinking water — boil-water advisories, regulatory action, and infrastructure events.

May 7, 2026

Data Centers Are Drinking Your Water: How AI Cooling Strains Local Drinking Supplies

Google's data centers used 8.1B gallons in 2024. Loudoun County's grew 250% in four years. Inside the AI water bill — and what it means for your tap.

Read full story →
Analysis

Iowa water quality overview

Iowa's drinking water quality is excellent overall, with an average score of 87.5 out of 100 across 436 cities tested. The median score is 89.6, serving a total population of 2,925,132 residents. 96% of cities earned an A or B grade, indicating broadly strong water quality infrastructure across the state. PFAS "forever chemicals" were detected in 112 of 436 cities tested (26%). 7 cities exceed the 2024 EPA maximum contaminant levels. 2 cities have lead levels exceeding the EPA action level of 15 ppb, often indicating aging infrastructure with lead service lines or lead solder. The state relies on a mix of water sources: 369 cities use groundwater while 63 draw from surface water such as rivers, lakes, and reservoirs.

Key Concerns

Issues to watch in Iowa

112 cities
PFAS Detected
26% of tested cities have PFAS in their water supply.
2 cities
Lead Exceedances
Lead levels above the EPA action level of 15 ppb (90th percentile).
303 cities
Health Violations
12,393 total violations recorded, 424 with unresolved issues.
5 cities
Failing Systems
Received a grade of F, indicating serious water quality issues.
Contaminant Data

Explore contaminants in Iowa

Lead in Iowa → Ranked by 90th percentile level (ppb) PFAS in Iowa → Ranked by compounds detected Copper in Iowa → Ranked by 90th percentile level (mg/L)

More contaminants tested in Iowa

HAA5 → Chromium-6 → Arsenic → Nitrate → Strontium → 1,4-Dioxane → Manganese → Vanadium → Chlorate → Molybdenum → Cobalt → Lithium → NDMA →
State context
14
Superfund sites in Iowa
EPA National Priorities List
89.8%
of Iowa residents on fluoridated water
CDC, 2020
5,377,629
lbs released to surface water
Top 10 TRI facilities, 2023
10.0%
of Iowa domestic wells exceed EPA arsenic limit
USGS, 521 samples · 10 µg/L MCL
Domestic well chemistry

Private-well water in Iowa

Based on USGS Powell Domestic-Well Database — 1,550 private wells sampled across Iowa. These wells are not regulated by the EPA; if you draw your tap from a private well, the public-system grade above does not apply to you.

1.0 µg/L
Median arsenic in domestic wells
P90 10.0 µg/L · max 153.0 µg/L
170 µg/L
Median manganese in domestic wells
35.1% exceed 300 µg/L aesthetic limit
Industrial pollution

Top industrial water polluters in Iowa

Industrial polluters nearby

The 10 facilities reporting the most pounds released to surface water in Iowa, 2023.

Total reported releases to surface water: 5,377,629 lbs

FacilityTop chemicalTo surface water (lbs/yr)
TYSON FRESH MEATS INC-LOUISA COUNTY
Food · TYSON FOODS INC
COLUMBUS JUNCTION, IA52738
Nitrate compounds (water dissociable; reportable only when in aqueous solution)1,339,654
CF INDUSTRIES NITROGEN LLC-PORT NEAL NITROGEN COMPLEX
Chemicals · CF INDUSTRIES HOLDINGS INC
SERGEANT BLUFF, IA51054
Nitrate compounds (water dissociable; reportable only when in aqueous solution)876,722
AJINOMOTO HEALTH & NUTRITION N.A. INC.
Chemicals · AJINOMOTO HEALTH & NUTRITION NORTH AMERICA INC
EDDYVILLE, IA52553
Nitrate compounds (water dissociable; reportable only when in aqueous solution)768,487
AGRI STAR MEAT & POULTRY LLC.
Food · LAURIDSEN GROUP INC
POSTVILLE, IA52162
Nitrate compounds (water dissociable; reportable only when in aqueous solution)577,258
JBS PORK
Food · JBS USA FOOD CO
OTTUMWA, IA52501
Nitrate compounds (water dissociable; reportable only when in aqueous solution)442,519

+ 5 more facilities

Source: EPA Toxic Release Inventory (TRI) 2023

Test your own tap

Get your Iowa water tested

City-level data shows the source and infrastructure picture — but lead and other home-plumbing issues only show up at your tap. Find a state-certified lab, see what to test for, and what it costs.
Grade Distribution

How Iowa cities scored

A: 344 B: 76 C: 6 D: 5 F: 5

Best Cities

  1. A+ Asbury 97.8
  2. A+ Cresco 97
  3. A+ Rockford 95.9

Worst Cities

  1. F Muscatine 36.9
  2. F Iowa City 42
  3. F Dubuque 42.5
City Map

Water quality across Iowa

Each dot is a city, colored by its water quality grade. Size reflects population served. Click any city to view its full water report.

All Cities

436 cities in Iowa

Full rankings →
# City Grade Score Population Violations
1 Asbury A+
97.8
6K 0
2 Cresco A+
97
4K 15
3 Rockford A+
95.9
762 5
4 Gilman A+
95.9
582 8
5 Brooklyn A+
95.8
15K 13
6 Bancroft A+
95.7
711 8
7 Evansdale A+
95.4
5K 5
8 Glenwood A+
95.2
5K 27
9 West Bend A+
95.2
791 9
10 Brooks A+
95.1
3K 6
11 Sumner A+
95.1
2K 38
12 Hartley A+
95
2K 0
13 Rolfe A+
95
509 35
14 Charter Oak A
94.8
522 24
15 Lenox A
94.7
1K 6
16 Winfield A
94.7
1K 5
17 Fairbank A
94.5
1K 11
18 Dakota City A
94.5
769 6
19 Montrose A
94.5
738 7
20 Strawberry Point A
94.4
1K 6
21 Villisca A
94.4
1K 6
22 Redfield A
94.4
744 8
23 Eagle Grove A
94.3
4K 5
24 Monroe A
94.3
2K 6
25 Dexter A
94.3
693 9
26 Hopkinton A
94.3
622 9
27 Melcher-Dallas A
94.2
1K 8
28 Colo A
94.2
853 7
29 Ainsworth A
94.2
511 6
30 Cascade A
94.1
2K 13
31 Prairie City A
94.1
2K 8
32 Dows A
94
526 7
33 Pocahontas A
93.9
2K 7
34 Central City A
93.9
1K 12
35 North English A
93.9
1K 16
36 Lansing A
93.9
983 6
37 Riceville A
93.9
816 43
38 Jesup A
93.8
3K 19
39 New Hartford A
93.8
570 6
40 Collins A
93.8
505 13
41 Elma A
93.8
505 20
42 Keota A
93.7
897 11
43 Northwood A
93.6
2K 10
44 Carson A
93.6
766 7
45 Murray A
93.6
684 20
46 Huxley A
93.5
5K 4
47 Logan A
93.5
1K 7
48 New Sharon A
93.5
1K 12
49 Saint Ansgar A
93.5
1K 12
50 Hamburg A
93.5
890 25
51 What Cheer A
93.5
607 10
52 Story City A
93.4
3K 7
53 Hubbard A
93.4
860 10
54 Manilla A
93.4
758 9
55 Badger A
93.4
561 13
56 Milford A
93.3
3K 9
57 Walcott A
93.3
2K 6
58 Inwood A
93.3
928 10
59 Norwalk A
93.2
15K 10
60 Denison A
93.2
12K 8
61 Graettinger A
93.2
9K 9
62 Spirit Lake A
93.2
6K 5
63 Vinton A
93.2
5K 8
64 Belmond A
93.2
2K 16
65 Farley A
93.2
2K 9
66 State Center A
93.2
1K 13
67 Clarence A
93.2
1K 20
68 Sabula A
93.2
506 12
69 Durant A
93.1
2K 4
70 Van Horne A
93.1
779 11
71 Shenandoah A
93
5K 17
72 West Liberty A
93
4K 15
73 New London A
93
2K 12
74 Stuart A
93
2K 22
75 Coon Rapids A
93
1K 1
76 Odebolt A
93
994 14
77 Walnut A
93
768 16
78 Breda A
93
500 15
79 Eldora A
92.9
3K 3
80 Grand Junction A
92.9
725 7
81 Radcliffe A
92.9
561 28
82 Marcus A
92.8
1K 15
83 Clive A
92.7
19K 6
84 Toledo A
92.7
2K 19
85 Rockwell A
92.6
1K 12
86 Sully A
92.6
881 26
87 Richland A
92.6
542 17
88 Anita A
92.5
972 7
89 Conrad A
92.4
1K 5
90 Melbourne A
92.4
765 5
91 Alburnett A
92.4
675 25
92 Ely A
92.3
2K 7
93 Epworth A
92.3
2K 5
94 Walker A
92.3
688 8
95 Bondurant A
92.2
9K 6
96 Nevada A
92.2
7K 22
97 Mount Vernon A
92.2
5K 9
98 New Hampton A
92.2
3K 6
99 Hawarden A
92.2
3K 31
100 Winthrop A
92.2
840 10
101 Lake View A
92.1
1K 11
102 Gladbrook A
92.1
799 10
103 Dayton A
92.1
772 14
104 Brighton A
92.1
600 11
105 Palo A
92
2K 14
106 Calmar A
92
1K 8
107 Wayland A
92
966 19
108 Olin A
92
651 12
109 Lake Park A
91.9
1K 11
110 Sloan A
91.9
1K 8
111 Wellsburg A
91.9
721 25
112 Sheldon A
91.8
6K 5
113 Sergeant Bluff A
91.8
5K 5
114 Larchwood A
91.8
926 19
115 Janesville A
91.7
1K 12
116 Jefferson A
91.6
4K 9
117 Albia A
91.6
4K 24
118 Garner A
91.6
3K 3
119 Sac City A
91.6
2K 3
120 Sigourney A
91.6
2K 3
121 Oakland A
91.6
2K 3
122 Aurelia A
91.6
968 3
123 Garnavillo A
91.6
763 4
124 Schaller A
91.6
729 9
125 Whiting A
91.6
727 4
126 Lakeside A
91.6
700 3
127 Goldfield A
91.6
634 3
128 Grundy Center A
91.5
3K 3
129 Traer A
91.5
2K 12
130 Buffalo Center A
91.5
857 4
131 Correctionville A
91.5
766 4
132 Morning Sun A
91.5
752 4
133 Audubon A
91.4
2K 4
134 Earlham A
91.4
1K 23
135 Schleswig A
91.4
803 36
136 Mount Pleasant A
91.3
11K 27
137 Perry A
91.3
8K 17
138 Oelwein A
91.3
6K 9
139 West Union A
91.3
3K 4
140 Elk Run Heights A
91.3
1K 6
141 Keosauqua A
91.3
961 11
142 Adair A
91.3
809 41
143 Anthon A
91.3
545 7
144 Newton A
91.2
17K 8
145 Humboldt A
91.2
5K 3
146 Mount Ayr A
91.2
2K 63
147 Crescent A
91.2
778 14
148 Grand Mound A
91.2
615 6
149 Delmar A
91.2
542 3
150 Lake Mills A
91.1
2K 7
151 Lake City A
91.1
2K 48
152 Sanborn A
91.1
1K 33
153 Fredericksburg A
91.1
987 7
154 Le Grand A
91.1
910 9
155 Merrill A
91.1
717 58
156 Wyoming A
91.1
523 8
157 Estherville A
91
6K 2
158 Pleasantville A
91
2K 4
159 Laurens A
91
1K 3
160 Mapleton A
91
1K 23
161 Lawton A
91
943 10
162 Kellogg A
91
617 7
163 Adel A
90.9
6K 13
164 Preston A
90.9
949 3
165 Independence A
90.8
6K 11
166 Long Grove A
90.8
988 61
167 Okoboji A
90.7
793 18
168 Hinton A
90.6
935 13
169 Le Mars A
90.5
11K 17
170 Manchester A
90.5
5K 3
171 Camanche A
90.5
5K 17
172 Waukon A
90.5
4K 4
173 Denver A
90.5
2K 14
174 Dallas Center A
90.5
2K 2
175 Clarksville A
90.5
1K 8
176 Arcadia A
90.5
525 6
177 Mitchellville A
90.4
3K 11
178 Guttenberg A
90.4
2K 8
179 Dike A
90.4
1K 5
180 Paullina A
90.4
996 6
181 Milo A
90.4
788 25
182 Greenfield A
90.3
4K 23
183 La Porte City A
90.3
2K 11
184 Truro A
90.3
525 18
185 Spencer A
90.2
18K 16
186 Dyersville A
90.2
4K 43
187 Decatur City A
90.2
1K 5
188 Newell A
90.2
906 10
189 Farmington A
90.2
601 30
190 Roland A
90.1
1K 6
191 Alden A
90.1
763 11
192 Albert City A
90.1
677 12
193 Webster City A
90
8K 8
194 Avoca A
90
6K 15
195 Luther A
90
5K 20
196 Onawa A-
90
3K 2
197 Springville A
90
1K 18
198 Alton A
90
1K 12
199 Kingsley A-
89.9
1K 11
200 Gowrie A-
89.9
954 7
201 Newhall A-
89.9
881 15
202 Exira A-
89.9
764 7
203 Hedrick A-
89.9
728 9
204 Moulton A-
89.9
607 2
205 Waukee A-
89.8
33K 26
206 Fort Madison A-
89.8
23K 37
207 Clear Lake A-
89.8
8K 22
208 May City A-
89.8
7K 3
209 South Amana A-
89.8
3K 15
210 Wall Lake A-
89.8
2K 30
211 Ogden A-
89.8
2K 14
212 Van Meter A-
89.8
2K 46
213 Essex A-
89.8
722 27
214 Battle Creek A-
89.8
700 33
215 Harlan A-
89.7
5K 1
216 Ida Grove A-
89.7
2K 18
217 Wheatland A-
89.7
775 12
218 Kanawha A-
89.7
658 2
219 Storm Lake A-
89.6
12K 8
220 Tipton A-
89.6
3K 2
221 Wilton A-
89.6
3K 4
222 Hudson A-
89.6
3K 4
223 Alta A-
89.6
2K 2
224 Manly A-
89.6
1K 2
225 George A-
89.6
1K 26
226 Mechanicsville A-
89.6
1K 13
227 Eldon A-
89.6
927 28
228 West Point A-
89.6
921 37
229 Earlville A-
89.6
724 31
230 Nashua A-
89.5
2K 21
231 Holstein A-
89.5
2K 12
232 Greene A-
89.5
994 3
233 Edgewood A-
89.5
939 3
234 Cambridge A-
89.5
832 10
235 Lowden A-
89.4
807 4
236 Ossian A-
89.4
802 3
237 Fairfax A-
89.3
3K 12
238 Gilbertville A-
89.3
794 20
239 Wellman A-
89.2
2K 45
240 Bedford A-
89.2
2K 39
241 Winterset A-
89.1
5K 31
242 Danville A-
89.1
923 26
243 Cedar Falls A-
89
41K 14
244 Manning A-
89
5K 38
245 Clarion A-
89
3K 4
246 Bellevue A-
89
3K 36
247 Coggon A-
89
701 41
248 Indianola A-
88.9
36K 18
249 Charles City A-
88.9
7K 4
250 Columbus Junction A-
88.9
2K 7
251 Remsen A-
88.9
2K 12
252 Shellsburg A-
88.9
1K 53
253 Primghar A-
88.9
896 4
254 Peosta A-
88.8
3K 65
255 Atkins A-
88.7
2K 32
256 Tabor A-
88.7
1K 6
257 Elkhart A-
88.7
882 12
258 Fontanelle A-
88.7
670 2
259 Seymour A-
88.6
637 4
260 Red Oak A-
88.5
9K 79
261 Shelby A-
88.5
727 18
262 Everly A-
88.5
575 66
263 Marshalltown A-
88.4
29K 45
264 Emmetsburg A-
88.3
4K 3
265 Akron A-
88.3
2K 15
266 Maquoketa A-
88.2
6K 38
267 Ackley A-
88.2
2K 8
268 Dysart A-
88.2
1K 4
269 Fayette A-
88.2
1K 2
270 Blairstown A-
88.1
738 9
271 Williamsburg A-
88
3K 15
272 Dumont A-
88
635 4
273 Sutherland A-
87.9
3K 21
274 Colfax A-
87.9
2K 12
275 Baxter A-
87.9
1K 8
276 Montezuma A-
87.8
3K 14
277 Aplington A-
87.8
1K 11
278 Minden A-
87.8
598 10
279 Ireton A-
87.7
6K 19
280 Shell Rock A-
87.7
1K 2
281 Glidden A-
87.7
1K 7
282 Waterloo A-
87.6
70K 23
283 Sibley A-
87.6
3K 4
284 Minburn A-
87.5
13K 14
285 Cherokee A-
87.5
10K 45
286 Hampton A-
87.5
4K 36
287 Hull A-
87.5
2K 3
288 Monona A-
87.5
1K 4
289 Treynor A-
87.5
1K 7
290 Allison A-
87.5
966 4
291 Boyden A-
87.5
701 5
292 Keokuk A-
87.4
10K 8
293 Sioux Center A-
87.4
8K 4
294 Corydon A-
87.4
2K 149
295 Hazleton A-
87.4
803 37
296 Elgin A-
87.4
685 7
297 Atlantic A-
87.3
7K 2
298 Stratford A-
87.3
7K 13
299 Ventura A-
87.3
716 3
300 Keystone A-
87.3
599 33
301 Pella A-
87.2
11K 85
302 Corning A-
87.2
2K 129
303 Dunkerton A-
87.2
1K 30
304 Sheffield A-
87.1
1K 8
305 Maxwell A-
87.1
859 10
306 Whittemore A-
87.1
522 10
307 Grimes A-
87
17K 24
308 Orange City A-
87
6K 5
309 Carlisle A-
87
4K 11
310 Titonka A-
87
511 4
311 Panora A-
86.9
4K 100
312 Norway A-
86.9
2K 20
313 Manson A-
86.9
2K 33
314 Urbana A-
86.7
2K 1
315 Griswold A-
86.7
1K 13
316 Readlyn A-
86.7
845 1
317 Agency A-
86.7
620 1
318 Swea City A-
86.7
584 1
319 Postville A-
86.6
3K 8
320 Dunlap A-
86.6
1K 16
321 Carter Lake A-
86.5
5K 20
322 Bloomfield A-
86.4
3K 88
323 Leon A-
86.4
2K 27
324 Hills A-
86.4
863 2
325 Ellsworth A-
86.3
514 14
326 Buffalo A-
86.2
1K 74
327 Oskaloosa A-
86
23K 37
328 Tama A-
86
8K 44
329 Mediapolis A-
86
2K 15
330 Marion A-
85.9
44K 98
331 Zearing A-
85.9
528 28
332 Granger A-
85.8
2K 7
333 Arnolds Park A-
85.7
1K 1
334 Moville A-
85.6
2K 75
335 Riverside A-
85.6
1K 31
336 Tripoli A-
85.6
1K 2
337 Guthrie Center A-
85.5
2K 3
338 Clinton A-
85.4
25K 2
339 Madrid A-
85.4
5K 7
340 Ruthven A-
85.4
779 1
341 Mason City A-
85.3
27K 143
342 Fairfield A-
85.3
10K 28
343 Creston A-
85.1
28K 27
344 Des Moines B+
85
250K 35
345 Pomeroy A-
85
671 9
346 Middle Amana B+
84.9
1K 6
347 Armstrong B+
84.9
930 26
348 Rock Valley B+
84.8
6K 34
349 Gilbert B+
84.8
1K 40
350 Mcgregor B+
84.8
902 21
351 Tiffin B+
84.7
5K 25
352 Kalona B+
84.7
3K 26
353 Elk Horn B+
84.7
631 9
354 Malvern B+
84.6
1K 17
355 Centerville B+
84.5
38K 75
356 Burlington B+
84.5
35K 26
357 Polk City B+
84.5
7K 2
358 Nora Springs B+
84.5
1K 3
359 Lamoni B+
84.4
2K 27
360 Fonda B+
84.3
636 6
361 Moravia B+
84.1
637 15
362 Ottumwa B+
84
43K 31
363 Osage B+
84
4K 13
364 Britt B+
84
2K 3
365 Altoona B+
83.9
27K 37
366 Waverly B+
83.7
48K 30
367 West Burlington B+
83.7
4K 31
368 Stanwood B+
83.6
637 4
369 Woodbine B+
83.5
2K 8
370 Sioux Rapids B+
83.4
920 25
371 Eldridge B+
83.2
9K 51
372 Doon B+
83.1
2K 69
373 Clermont B+
83.1
586 31
374 Delhi B+
83
509 110
375 Council Bluffs B+
82.9
66K 45
376 Donnellson B+
82.7
885 48
377 Elkader B+
82.6
1K 36
378 Slater B+
82.5
2K 11
379 Rockwell City B+
82.4
3K 22
380 Washington B+
82.2
7K 96
381 Rock Rapids B+
82.2
6K 36
382 De Witt B+
81.8
6K 123
383 Neola B+
81.8
906 35
384 West Des Moines B+
81.6
70K 31
385 Parkersburg B+
81.6
2K 3
386 Ames B+
81.5
97K 70
387 Johnston B+
80.9
25K 45
388 Hospers B+
80.8
4K 25
389 Lisbon B+
80.8
2K 86
390 Lone Tree B+
80.6
1K 17
391 Decorah B+
80.5
9K 82
392 Wapello B+
80.5
2K 94
393 Early B+
80.5
587 30
394 Reinbeck B+
80.4
2K 8
395 Urbandale B+
80.2
46K 8
396 Belle Plaine B+
80.1
2K 10
397 Carroll B
79.8
10K 2
398 Forest City B
79.8
4K 94
399 Center Point B
79.8
3K 43
400 Iowa Falls B
79.7
5K 15
401 West Branch B
79.3
3K 18
402 Knoxville B
79.2
15K 8
403 Jewell B
79.2
1K 4
404 Clarinda B
78.8
9K 78
405 Algona B
78.8
6K 67
406 Woodward B
78.8
6K 46
407 Princeton B
78.8
981 67
408 Boone B
78.7
13K 44
409 Sidney B
78.4
1K 21
410 Osceola B
78.2
10K 39
411 De Soto B
78.2
960 25
412 Ankeny B
77.7
78K 99
413 Sioux City B
77.3
86K 35
414 Coralville B
77.3
24K 104
415 Scranton B
76.2
504 21
416 Anamosa B-
74.8
6K 35
417 Chariton B-
74.4
4K 98
418 Hiawatha B-
73.2
7K 64
419 Marengo B-
71.1
2K 55
420 North Liberty B-
70
21K 120
421 Victor C+
68.7
875 19
422 Missouri Valley C+
66.3
3K 79
423 Bettendorf C+
65.6
929 173
424 Oxford C+
65.2
1K 114
425 Blue Grass C
60.6
2K 363
426 Davenport C-
55
148K 143
427 Grinnell D+
54.5
10K 23
428 Fort Dodge D+
50.4
27K 271
429 Monticello D
46
4K 265
430 Cedar Rapids D
45.5
144K 365
431 Walford D
45
728 98
432 Solon F
44
4K 364
433 Swisher F
43.1
724 119
434 Dubuque F
42.5
63K 354
435 Iowa City F
42
101K 691
436 Muscatine F
36.9
28K 320
Counties

Browse Iowa counties

Adair 4 cities · avg 90.8 Adams 2 cities · avg 91.2 Allamakee 3 cities · avg 90.3 Appanoose 2 cities · avg 87 Audubon 2 cities · avg 90.7 Benton 11 cities · avg 84.4 Black Hawk 8 cities · avg 90 Boone 5 cities · avg 86.2 Bremer 5 cities · avg 89.9 Buchanan 5 cities · avg 91.7 Buena Vista 6 cities · avg 89.1 Butler 8 cities · avg 88.3 Calhoun 4 cities · avg 86.3 Carroll 6 cities · avg 88.8 Cass 3 cities · avg 88.8 Cedar 7 cities · avg 88.3 Cerro Gordo 4 cities · avg 88.8 Cherokee 3 cities · avg 90.6 Chickasaw 3 cities · avg 90.9 Clarke 2 cities · avg 85.9 Clay 2 cities · avg 89.3 Clayton 7 cities · avg 88.7 Clinton 6 cities · avg 88.3 Crawford 4 cities · avg 93.2 Dallas 11 cities · avg 88.3 Davis 1 city · avg 86.4 Decatur 4 cities · avg 86.4 Delaware 4 cities · avg 89.3 Des Moines 4 cities · avg 85.8 Dickinson 5 cities · avg 91 Dubuque 7 cities · avg 85.6 Emmet 2 cities · avg 88 Fayette 5 cities · avg 88.3 Floyd 3 cities · avg 89.8 Franklin 2 cities · avg 87.3 Fremont 3 cities · avg 86.9 Greene 3 cities · avg 86.9 Grundy 5 cities · avg 89.3 Guthrie 2 cities · avg 86.2 Hamilton 3 cities · avg 85.2 Hancock 3 cities · avg 88.4 Hardin 6 cities · avg 89.5 Harrison 4 cities · avg 82.5 Henry 4 cities · avg 92.8 Howard 3 cities · avg 94.9 Humboldt 2 cities · avg 92.8 Ida 3 cities · avg 89.7 Iowa 6 cities · avg 82.7 Jackson 4 cities · avg 90.3 Jasper 7 cities · avg 91.3 Jefferson 1 city · avg 85.3 Johnson 9 cities · avg 65.9 Jones 4 cities · avg 76 Keokuk 5 cities · avg 92.3 Kossuth 5 cities · avg 87.1 Lee 5 cities · avg 88.8 Linn 14 cities · avg 84.9 Louisa 3 cities · avg 87 Lucas 1 city · avg 74.4 Lyon 5 cities · avg 88 Madison 4 cities · avg 89.9 Mahaska 2 cities · avg 89.8 Marion 4 cities · avg 87.9 Marshall 6 cities · avg 90.8 Mills 2 cities · avg 89.9 Mitchell 2 cities · avg 88.8 Monona 3 cities · avg 90.9 Monroe 1 city · avg 91.6 Montgomery 2 cities · avg 91.5 Muscatine 3 cities · avg 73.2 O'Brien 5 cities · avg 91.4 Osceola 3 cities · avg 88.4 Page 3 cities · avg 87.2 Palo Alto 4 cities · avg 90.5 Plymouth 6 cities · avg 89.9 Pocahontas 4 cities · avg 91 Polk 12 cities · avg 85.4 Pottawattamie 9 cities · avg 88.4 Poweshiek 2 cities · avg 71.2 Ringgold 1 city · avg 91.2 Sac 6 cities · avg 89.8 Scott 8 cities · avg 76.7 Shelby 4 cities · avg 88.2 Sioux 9 cities · avg 87.2 Story 12 cities · avg 89 Tama 6 cities · avg 91 Taylor 3 cities · avg 89.7 Van Buren 2 cities · avg 90.8 Wapello 3 cities · avg 86.8 Warren 3 cities · avg 90.2 Washington 6 cities · avg 88 Wayne 2 cities · avg 88 Webster 4 cities · avg 81.5 Winnebago 3 cities · avg 87.5 Winneshiek 3 cities · avg 87.3 Woodbury 7 cities · avg 88.6 Worth 2 cities · avg 91.6 Wright 5 cities · avg 92.4
ZIP Codes

Browse Iowa by ZIP code

Look up water quality by ZIP code to find the systems serving your area.

View all Iowa ZIP codes →
FAQ

Frequently asked questions about Iowa's water

Is Iowa's tap water safe to drink?

Iowa's water quality varies by city. The statewide average grade is A- (87.5/100). 96% of cities scored an A or B, while 2% received a D or F. Check your specific city for detailed results.

Which Iowa cities have the best water quality?

The top-rated cities are Asbury (A+), Cresco (A+), Rockford (A+). These cities scored highest based on violation history, lead levels, PFAS contamination, and regulatory compliance.

Which Iowa cities have the worst water quality?

The lowest-rated cities are Muscatine (F), Iowa City (F), Dubuque (F). We recommend residents in these areas consider water filtration and review their city's specific contaminant data.

How many Iowa cities have PFAS in their water?

112 out of 436 cities tested positive for PFAS "forever chemicals" (26%). 7 cities exceed the 2024 EPA maximum contaminant levels. Reverse osmosis or activated carbon filters can help reduce PFAS exposure.

Do any Iowa cities have dangerous lead levels?

2 cities exceed the EPA lead action level of 15 ppb. Lead contamination typically comes from aging pipes and lead service lines rather than the water source itself. An NSF 53-certified filter can effectively remove lead from tap water.

Water quality resources

Guide
How to Read Your Water Quality Report
Read guide →
Guide
Lead in Drinking Water
Read guide →
Guide
PFAS Forever Chemicals Explained
Read guide →
News
Latest Water Quality News
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