PlainEnviro

Iowa Water Systems

1,078 community water systems in Iowa, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems
1,078
Health-Based Violation Records
742
Health Violations
121 systems
Population Served
3,019,942

Iowa community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (62)

# System Name Violations Health
1 CHARITON MUNICIPAL WATER WORKS Chariton 82 Yes
2 GRINNELL WATER DEPARTMENT Grinnell 35 Yes
3 LEON WATER SUPPLY Leon 22 Yes
4 DYERSVILLE MUNICIPAL WATER CO Dyersville 16 Yes
5 OSCEOLA WATER WORKS Osceola 13 Yes
6 SAC & FOX (MESKWAKI) IN IOWA Tama 12 Yes
7 DONNELLSON MUNI WATER WORKS Donnellson 12 Yes
8 EARLY MUNICIPAL WATER SUPPLY Early 11 Yes
9 SIOUX CITY WATER SUPPLY Sioux City 10 Yes
10 LAMONI MUNICIPAL UTILITIES Lamoni 8 Yes
11 BOONE WATER WORKS Boone 7 Yes
12 TOLEDO WATER SUPPLY Toledo 6 Yes
13 BELLEVUE MUNICIPAL UTILITIES Bellevue 5 Yes
14 FAIRBANK WATER SUPPLY Fairbank 5 Yes
15 CORNING MUNI WATER DEPARTMENT Corning 4 Yes
16 WOODWARD WATER SUPPLY Woodward 4 Yes
17 KEYSTONE WATER SUPPLY Keystone 4 Yes
18 ALTOONA WATER SUPPLY Altoona 3 Yes
19 SPIRIT LAKE WATERWORKS Spirit Lake 3 Yes
20 XENIA RWD (BOONE) Bouton 3 Yes
21 REGIONAL WATER Avoca 3 Yes
22 ROCK VALLEY RURAL WATER DISTRICT Rock Valley 3 Yes
23 ATKINS MUNICIPAL WATER WORKS Atkins 3 Yes
24 SLATER MUNI WATER DEPT Slater 3 Yes
25 PRINCETON WATER SUPPLY Princeton 3 Yes
26 BLAIRSTOWN WATER SUPPLY Blairstown 3 Yes
27 ZEARING WATER DEPARTMENT Zearing 3 Yes
28 DES MOINES WATER WORKS Des Moines 2 Yes
29 WATERLOO WATER WORKS Waterloo 2 Yes
30 UNIVERSITY WATER SYSTEM Iowa City 2 Yes
31 BURLINGTON MUNICIPAL WATERWORKS Burlington 2 Yes
32 MAHASKA RURAL WATER SYSTEM, INC. Oskaloosa 2 Yes
33 CRESTON WATER SUPPLY Creston 2 Yes
34 WINTERSET MUNICIPAL WATERWORKS Winterset 2 Yes
35 ANAMOSA MUNICIPAL WATER SUPPLY Anamosa 2 Yes
36 RURAL WATER SYSTEM #1 Hospers 2 Yes
37 MADRID WATER DEPARTMENT Perry 2 Yes
38 MITCHELLVILLE WATER SUPPLY Mitchellville 2 Yes
39 ROCKWELL CITY WATER SUPPLY Rockwell City 2 Yes
40 GREENFIELD MUNICIPAL UTILITIES Greenfield 2 Yes
41 XENIA RWD (MADRID) Bouton 2 Yes
42 LAKE VIEW WATER SUPPLY Lake View 2 Yes
43 DANVILLE WATER SUPPLY Muscatine 2 Yes
44 NEWHALL WATER SUPPLY Van Horne 2 Yes
45 WALL LAKE WATER SUPPLY Wall Lake 2 Yes
46 WHEATLAND CITY WATER SUPPLY Wheatland 2 Yes
47 EXIRA WATER DEPT Exira 2 Yes
48 SCHALLER WATER SUPPLY Schaller 2 Yes
49 MARION MUNICIPAL WATER DEPT Marion 1 Yes
50 FARLEY WATER SUPPLY Farley 1 Yes
51 PLEASANTVILLE WATER WORKS Pleasantville 1 Yes
52 CLARINDA TREATMENT COMPLEX Clarinda 1 Yes
53 AMANA SOCIETY WATER SYSTEM NORTH Amana 1 Yes
54 APLINGTON WATER SUPPLY Aplington 1 Yes
55 MALVERN WATER SUPPLY Malvern 1 Yes
56 LANSING WATER SUPPLY Lansing 1 Yes
57 DE SOTO WATER SUPPLY Adel 1 Yes
58 ARMSTRONG WATER SUPPLY Armstrong 1 Yes
59 MONTROSE WATER WORKS Montrose 1 Yes
60 WOODWARD RESOURCE CENTER Woodward 1 Yes
61 POMEROY WATER SUPPLY Pomeroy 1 Yes
62 DELMAR WATER SUPPLY Maquoketa 1 Yes

Systems with No Violations (438)

438 water systems in Iowa have zero recorded violations. Showing the 50 largest by population served.

IOWA-AMERICAN WTR CO-DAVENPORT (147,720) CEDAR RAPIDS WATER DEPARTMENT (142,364) ANKENY, CITY OF (76,207) WEST DES MOINES WATER WORKS (73,959) IOWA CITY WATER DEPARTMENT (68,753) COUNCIL BLUFFS WATER WORKS (64,447) DUBUQUE WATER WORKS (59,667) AMES WATER TREATMENT PLANT (55,177) URBANDALE WATER UTILITY (45,605) ISU (42,000) CEDAR FALLS MUNICIPAL WATER UTILITIES (40,713) IA REGIONAL UTILITIES ASSOC (WAVERLY) (37,820) RATHBUN REGIONAL WATER ASSN (RATHBUN) (33,000) WAUKEE WATER SUPPLY (31,823) MARSHALLTOWN WATER WORKS (27,680) MASON CITY WATER DEPARTMENT (27,338) FORT DODGE WATER SUPPLY (25,874) OTTUMWA WATER WORKS (25,529) MUSCATINE POWER & WATER (25,516) JOHNSTON MUNICIPAL WATER SUPPLY (24,897) IOWA-AMERICAN WTR CO-CLINTON DISTRICT (24,769) NORTH LIBERTY WATER SUPPLY (23,276) CORALVILLE MUNI WATER SYSTEM (22,318) SIRWA #2 (CRESTON) (20,793) CLIVE WATER DEPARTMENT (20,277) WARREN WATER DISTRICT (20,095) GRIMES WATER SUPPLY (17,809) WAPELLO RURAL WATER ASSOC. (17,263) NEWTON WATER SUPPLY (16,518) INDIANOLA WATER SUPPLY (15,833) NORWALK WATER SUPPLY (14,334) POWESHIEK WATER ASSOCIATION (13,920) XENIA RWD (DES MOINES) (12,860) OSKALOOSA MUNICIPAL WATER DEPT (12,808) RATHBUN REG WATER ASSN (FT MADISON) (11,840) STORM LAKE WATER TREATMENT PLANT (11,431) SPENCER MUNICIPAL WATER UTILITY (11,325) FT MADISON MUNI WATER WORKS (11,087) PELLA WATER WORKS DEPARTMENT (11,052) LEMARS WATER DEPARTMENT (10,606) WAVERLY WATER DEPARTMENT (10,394) CARROLL MUNICIPAL WATER SUPPLY (10,184) KEOKUK MUNICIPAL WATER WORKS (9,900) FAIRFIELD WATER SUPPLY (9,821) BONDURANT MUNI WATER SUPPLY (9,393) DENISON WATER SUPPLY (9,381) MOUNT PLEASANT MUNICIPAL UTILITIES (9,274) IOWA LAKES REGIONAL WATER - OSGOOD (9,021) KNOXVILLE WATER WORKS (8,400) RATHBUN REG WTR ASSN (BURLINGTON) (8,375) +388 more

All Water Systems in Iowa (1,078)

Page 17 of 22, ordered by population served.

System Population Served Violations
DROESSLER'S WATER 158 0
BARNES CITY WATER SUPPLY 156 0
HICKORY HILLS FIRST ANNEX HOA 156 0
MAYSVILLE MUNICIPAL WATER DEPT 156 0
PRAIRIE VIEW ESTATES ASSOC JOHNSON CNTY 155 0
TWIN VIEW HEIGHTS 155 0
RANDALL WATER SUPPLY 154 0
INDIAN RIDGE MOBILE HOME COMMUNITY 153 0
HASTINGS WATER SUPPLY 152 22
DICKENS WATER WORKS 151 0
HARRIS WATER SUPPLY 151 0
WINDING BROOK MOBILE HOME PARK 150 0
LITTLE SIOUX WATER DEPARTMENT 150 2
VERN ACRES (OLIPHANT ADDITION) 150 0
HAMMOND ESTATES 150 0
LEISURE LIVING MANF HOME COMMUNITY 150 0
ANCHORS POINT COA 150 0
WOODS AND MEADOWS SUBDIVISION 148 0
BRADDYVILLE WATER WORKS 147 0
LONE ROCK WATER SUPPLY 146 0
CALUMET WATER SUPPLY 146 0
BRISTOW MUNI WATER SUPPLY 145 9
DEVILS CREEK ESTATES HOME ASSOC 145 0
CASTALIA WATER WORKS 145 0
SWALEDALE WATER SUPPLY 144 0
SPRINGBROOK WATER DEPT 144 0
HENDERSON WATER DEPARTMENT 144 0
WEST CHESTER MUNI WTR SUPPLY 144 0
WOOLSTOCK WATER SUPPLY 144 0
BRAYTON WATER SYSTEM 143 0
DELAWARE MUNICIPAL WATER SUPPLY 142 0
GOODELL WATER SUPPLY 140 0
FORESTGATE SUBDIVISION 140 0
CLEMONS WATER SUPPLY 140 0
MT JOY MOBILE HOME PARK 140 1
CHESTER WATER SUPPLY 139 0
SOUTHSHORE HEIGHTS 138 0
PALMER WATER SUPPLY 138 0
NEW LIBERTY WATER SUPPLY 138 0
GENEVA WATER WORKS 136 0
CLARE WATER DEPARTMENT 136 0
MILLERSBURG WATER DEPT 135 0
LAKEWOOD UTILITIES 135 0
FRANKVILLE RWD 135 0
LAKE VISTA SUBDIVISION 134 0
SUPERIOR WATER SYSTEM 132 0
TIMBER VALLEY ESTATES (1ST & 2ND ADD) 132 0
BREEZY POINTE SUBDIVISION 130 0
HAVELOCK WATER SUPPLY 130 0
HICKORY HILLS SECOND ANNEX 130 0
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Frequently Asked Questions

How many water systems are in Iowa?
Iowa has 1,078 community water systems tracked by the EPA, serving a combined population of 3,019,942 people.
How many water systems in Iowa have health violations?
121 water systems in Iowa have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 11% of all systems in the state.
How many health-based violation records are in this extract for Iowa?
PlainEnviro's health-based EPA SDWIS extract contains 742 records joined to 1,078 active community water systems in Iowa. Monitoring and reporting records are not included.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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