STATE REPORT IL 7 ALERTS 752 HEALTH VIOLATIONS

Illinois Water: 7.4K Violations - 1583 ZIPs

1583 ZIP codes · 1480 water systems · State-specific plumbing code · Updated 2026-07-19

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-07-19

ZipCheckup tracks drinking-water and home-safety data for 1,583 ZIP codes across Illinois, covering 1,480 public water systems that serve about 10,961,669 people. 1,089 ZIP codes carry at least one EPA violation on record.

1583
ZIP Codes
1480
Water Systems
1089
ZIPs with Violations
7
Active Alerts
State-specific
Plumbing Code
C · 61
Avg Safety Score
97
ZIPs Exceeding Lead Limit
50%
High Radon Risk (Zone 1)
#36
of 51 States
28%
ZIPs Rated A or B
69%
ZIPs with Violations
C
Illinois average: 61/100 - ranked #36 of 51 states. 6 points below the national average (67). 69% of ZIP codes have recorded violations.

Recent compliance reports place Illinois below the national average for public water safety.

Score Distribution

How Illinois's 1583 ZIP codes are distributed across safety grades.

9
A
440
B
653
C
402
D
79
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

Data: EPA SDWIS, FEMA NFIP, EPA Radon, USGS Earthquake Hazards, NIFC Wildfire • 2026-07-19

Top 10 Safest ZIP Codes in Illinois

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 62953 JoppaMassac 94 A
2 62992 UllinPulaski 93 A
3 62976 PulaskiPulaski 91 A
4 60552 SomonaukLaSalle 87 A
5 61370 TonicaLaSalle 87 A
6 61332 LeonoreLaSalle 85 A
7 62914 CairoAlexander 85 A
8 62956 KarnakPulaski 85 A
9 62964 MoundsPulaski 85 A
10 60531 LelandLaSalle 84 B

10 Lowest-Scoring ZIP Codes in Illinois

#ZIP CodeCityCountyScoreGradeViolations
1 61484 VermontFulton 13 F 15
2 61615 PeoriaPeoria 22 F 8
3 61614 PeoriaPeoria 22 F 8
4 61604 PeoriaPeoria 22 F 8
5 61656 PeoriaPeoria 23 F 8
6 61654 PeoriaPeoria 23 F 8
7 61651 PeoriaPeoria 23 F 8
8 61643 PeoriaPeoria 23 F 8
9 61641 PeoriaPeoria 23 F 8
10 61639 PeoriaPeoria 23 F 8

County Rankings

Water quality breakdown by county. 102 counties with data in Illinois.

Loading county map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

County-level aggregation of ZIP code safety scores • EPA SDWIS, FEMA NFIP, EPA Radon, USGS, NIFC

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
McHenry 68 C 21 60097 (82) 60081 (50)
Lake 63 C 32 60083 (83) 60084 (46)
Cook 68 C 219 60179 (83) 60409 (39)
DuPage 70 B 51 60105 (83) 60598 (45)
Kane 49 D 32 60136 (70) 60505 (25)
DeKalb 57 C 12 60112 (70) 60111 (40)
Ogle 55 C 16 61084 (70) 61043 (40)
Jo Daviess 56 C 10 61041 (70) 61059 (40)
Jersey 56 C 9 62063 (70) 62037 (35)
Will 66 C 27 60446 (83) 60433 (44)
Grundy 56 C 11 60407 (66) 60420 (41)
Livingston 54 D 19 61741 (70) 60934 (24)
Kankakee 67 C 15 60468 (83) 60969 (53)
Kendall 58 C 7 60541 (65) 60537 (45)
LaSalle 67 C 24 60552 (87) 61372 (50)
Lee 53 D 16 61042 (69) 61378 (29)
Boone 50 D 8 61065 (65) 61011 (40)
Iroquois 54 D 23 60973 (70) 60930 (28)
Ford 51 D 9 60936 (66) 61773 (28)
Vermilion 57 C 23 60942 (70) 61870 (32)
Champaign 57 C 34 61843 (70) 61872 (40)
Stephenson 53 D 14 61060 (70) 61070 (31)
Carroll 58 C 7 61051 (70) 61078 (32)
Winnebago 47 D 28 61063 (70) 61104 (28)
Whiteside 54 D 13 62353 (63) 61258 (40)
Rock Island 54 D 21 61266 (69) 61244 (26)
Scott 61 C 5 62621 (65) 62610 (55)
Mercer 58 C 13 61231 (70) 62465 (40)
Henry 58 C 14 61238 (70) 61262 (27)
Bureau 59 C 24 61329 (70) 61356 (36)
Putnam 62 C 7 61336 (70) 61335 (53)
Marshall 61 C 9 61369 (70) 61560 (40)
Knox 57 C 20 61410 (68) 61474 (40)
McDonough 56 C 11 61420 (70) 62326 (33)
Warren 56 C 6 61462 (69) 61453 (40)
Fulton 56 C 19 61415 (70) 61484 (13)
Henderson 57 C 8 61418 (70) 61425 (35)
Stark 56 C 5 61491 (63) 61426 (40)
Hancock 53 D 18 62380 (70) 61450 (23)
Schuyler 58 C 4 62681 (66) 62319 (40)
Woodford 60 C 13 61738 (70) 61771 (33)
Peoria 37 F 40 61525 (70) 61615 (22)
Mason 53 D 7 61532 (66) 61543 (35)
Tazewell 60 C 20 61568 (70) 61605 (37)
McLean 57 C 30 61770 (70) 61720 (34)
De Witt 52 D 9 61882 (67) 61750 (40)
Logan 52 D 14 62671 (70) 62666 (28)
Macon 57 C 18 62544 (70) 62532 (40)
Piatt 60 C 11 61854 (70) 61855 (40)
Douglas 55 C 7 61910 (65) 61941 (40)
Moultrie 53 D 4 61951 (67) 61911 (40)
Coles 54 D 7 61920 (61) 61931 (45)
Edgar 52 D 8 61944 (68) 61917 (37)
Madison 69 C 30 62058 (83) 62201 (50)
Shelby 71 B 13 62462 (83) 62553 (53)
St. Clair 68 C 30 62001 (83) 62203 (45)
Macoupin 71 B 21 62630 (83) 62674 (50)
Montgomery 70 B 16 62075 (83) 62076 (53)
Calhoun 46 D 7 62013 (54) 62065 (40)
Greene 59 C 10 62044 (68) 62098 (40)
Alexander 73 B 8 62914 (85) 62957 (60)
Fayette 70 B 8 62838 (83) 62247 (53)
Christian 68 C 13 62556 (83) 62555 (53)
Bond 67 C 6 62273 (79) 62284 (53)
Washington 69 C 9 62803 (82) 62831 (53)
Clinton 67 C 15 62219 (83) 62216 (35)
Randolph 66 C 17 62217 (83) 62244 (50)
Monroe 68 C 5 62248 (78) 62295 (54)
Perry 74 B 5 62997 (80) 62238 (67)
Jackson 69 C 17 62916 (83) 62975 (53)
Adams 57 C 19 62339 (70) 62349 (29)
Pike 61 C 15 62345 (70) 62357 (40)
Brown 58 C 1 62378 (58) 62378 (58)
Effingham 70 B 7 62401 (83) 62443 (53)
Wabash 77 B 5 62855 (83) 62852 (72)
Crawford 68 C 7 62449 (83) 62464 (53)
Lawrence 61 C 4 62466 (73) 62439 (49)
Richland 72 B 8 62452 (83) 62475 (53)
Clark 69 C 7 62441 (80) 62423 (53)
Clay 70 B 6 62858 (82) 62879 (53)
Cumberland 68 C 6 62436 (80) 62435 (53)
Jasper 62 C 5 62445 (83) 62481 (53)
Wayne 63 C 9 62895 (82) 62878 (53)
Edwards 63 C 7 62806 (83) 62815 (51)
Sangamon 53 D 56 62689 (70) 62520 (29)
Morgan 56 C 10 62601 (68) 62695 (40)
Cass 53 D 9 62612 (69) 62617 (35)
Menard 59 C 7 62673 (66) 62655 (53)
Marion 79 B 8 62849 (83) 62807 (69)
White 71 B 8 62862 (81) 62809 (53)
Jefferson 68 C 14 62893 (83) 62889 (53)
Franklin 68 C 16 62884 (82) 62874 (50)
Hamilton 64 C 6 62828 (72) 62859 (53)
Gallatin 73 B 7 62871 (83) 62834 (53)
Williamson 72 B 10 62915 (83) 62948 (48)
Union 70 B 7 62905 (83) 62973 (53)
Johnson 64 C 11 62939 (81) 62995 (51)
Massac 81 B 3 62953 (94) 62910 (66)
Saline 76 B 7 62977 (83) 62935 (64)
Hardin 65 C 5 62919 (83) 62955 (53)
Pope 55 C 2 62938 (57) 62928 (53)
Pulaski 79 B 9 62992 (93) 62970 (64)

Most Common Contaminants in Illinois

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Surface Water Treatment Rule Treatment Technique 719 1390 No
Stage 1 DBP Rule Treatment Technique 467 752 Yes
Stage 2 DBP Rule Treatment Technique 413 898 Yes
Lead and Copper Rule Treatment Technique 397 825 No
Consumer Confidence Report Rule Reporting 362 704 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 352 548 Yes
Revised Total Coliform Rule Microbiological 291 423 No
Gross Beta Radionuclides 143 620 Yes

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 1583 ZIP codes across Illinois, covering 1480 community water systems that serve approximately 10,961,669 people.

1089 of 1583 ZIP codes (69%) have recorded EPA violations. 752 health-based violations have been documented.

Active Weather Alerts

7 active alerts in Illinois including 1 warning. Severe weather can directly affect tap water quality - flooding, power outages, and infrastructure damage may lead to boil-water advisories.

Alert Severity Areas
Flood Warning Severe Brown, IL; Cass, IL; Morgan, IL; Schuyler, IL
Heat Advisory Moderate Jefferson; Perry; Franklin; Hamilton; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New Madrid
Air Quality Alert Unknown Jo Daviess; Stephenson; Carroll; Whiteside; Rock Island; Henry; Bureau; Putnam; Mercer; Henderson; Warren; Hancock; McDonough
Air Quality Alert Unknown Knox; Stark; Peoria; Marshall; Woodford; Fulton; Tazewell; McLean; Schuyler; Mason; Logan; De Witt; Piatt; Champaign; Vermilion; Cass; Menard; Scott; Morgan; Sangamon; Christian; Macon; Moultrie; Douglas; Coles; Edgar; Shelby; Cumberland; Clark; Effingham; Jasper; Crawford; Clay; Richland; Lawrence
Air Quality Alert Unknown Winnebago; Boone; McHenry; Lake; Ogle; Lee; De Kalb; Kane; DuPage; La Salle; Kendall; Grundy; Kankakee; Livingston; Iroquois; Ford; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will

View all Illinois alerts →

Plumbing Regulations

Illinois follows the Illinois Plumbing Code (IPC-based with heavy amendments) (2014 edition).

  • Plumbing code: State-specific (2014)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full Illinois regulations →

Areas with Most Violations

ZIP Code City Safety Score Violations Health-Based System
62450 Olney B 114 1 Olney
60150 Malta D 92 1 Malta
61350 Ottawa C 73 3 Ottawa
60431 Joliet D 51 7 Joliet
60432 Joliet D 51 7 Joliet
60433 Joliet D 51 7 Joliet
60434 Joliet C 51 7 Joliet
60435 Joliet D 51 7 Joliet
60436 Joliet D 51 7 Joliet
61282 Silvis D 36 5 Silvis

Areas with No Violations

ZIP Code City Safety Score System Population
60001 Alden D CRYSTAL LAKE 40,661
60022 Glencoe C Glencoe 8,849
60029 Golf C Golf 497
60031 Gurnee B Gurnee 30,193
60033 Harvard B Harvard 9,469
60035 Highland Park C Highland Park 30,176
60037 Fort Sheridan D HIGHWOOD 5,335
60038 Palatine D Palatine 70,875
60042 Island Lake B Island Lake 8,066
60055 Palatine D Palatine 70,875

Home Safety Score

Average Home Safety Score for Illinois: C (61/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0072 mg/L (EPA action level: 0.015 mg/L)
  • 97 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 797 ZIP codes (50%)
  • Moderate risk (Zone 2): 742 ZIP codes
  • Low risk (Zone 3): 20 ZIP codes

ZIP Code Reports for Illinois

Largest Communities

ZIP Code City Population Safety Grade Violations
60068 Park Ridge 2,906,256 C 4
60804 Cicero 2,886,638 C 7
60644 Chicago 2,833,188 C 19
60827 Riverdale 2,798,658 B 1
60631 Chicago 2,789,988 C 19
60656 Chicago 2,789,988 B 19
60633 Chicago 2,787,188 C 19
60707 Elmwood Park 2,781,670 C 2
60646 Chicago 2,779,538 C 19
60620 Chicago 2,770,131 C 19
60638 Chicago 2,769,657 B 19
60655 Chicago 2,769,251 B 19
60634 Chicago 2,761,897 C 19
60629 Chicago 2,752,588 C 19
60652 Chicago 2,752,588 C 19
60290 Chicago 2,750,188 C 19
60601 Chicago 2,750,188 B 19
60602 Chicago 2,750,188 B 19
60603 Chicago 2,750,188 B 19
60604 Chicago 2,750,188 B 19

Lowest Safety Scores

ZIP Code City Score Grade Violations
61484 Vermont 13 F 15
61604 Peoria 22 F 8
61614 Peoria 22 F 8
61615 Peoria 22 F 8
61450 La Harpe 23 F 6

Highest Safety Scores

ZIP Code City Score Grade Violations
62953 Joppa 94 A 4
62992 Ullin 93 A 2
62976 Pulaski 91 A 4
60552 Somonauk 87 A 0
61370 Tonica 87 A 0

All 1583 ZIP Codes in Illinois

Data Sources

Updated daily.

Largest water systems in Illinois

The 12 biggest community water systems serving Illinois, of 1480 total.

  • Chicago
    Serves ~2,746,388 people 19 violations
    B
  • Aurora
    Serves ~183,000 people 7 violations
    D
  • Joliet
    Serves ~160,000 people 51 violations
    C
  • Naperville
    Serves ~156,406 people 1 violation
    B
  • IL AMERICAN-CHAMPAIGN
    Serves ~150,000 people 3 violations
    D
  • Rockford
    Serves ~147,051 people 11 violations
    F
Show all 12 water systems

Systems with the most violations in Illinois

12 systems in Illinois with the most recorded EPA violations.

  • Olney
    Serves ~8,877 people 114 violations
    B
  • MALTA
    Serves ~1,143 people 92 violations
    D
  • OTTAWA
    Serves ~18,097 people 73 violations
    C
  • Joliet
    Serves ~160,000 people 51 violations
    C
  • Silvis
    Serves ~7,473 people 36 violations
    D
  • Aviston
    Serves ~2,545 people 36 violations
    B
  • Bloomington
    Serves ~77,610 people 31 violations
    C
  • Benton
    Serves ~8,104 people 30 violations
    C
  • Menard Correctional Center
    Serves ~2,950 people 30 violations
    C
  • Ej Water Cooperative
    Serves ~29,720 people 29 violations
    B
  • Peru
    Serves ~10,300 people 29 violations
    C
  • Kampsville
    Serves ~335 people 28 violations
    C

Frequently Asked Questions

Is the water safe to drink in Illinois?

Illinois has 1480 community water systems serving 10,961,669 people across 1583 ZIP codes. There are 7,431 recorded violations, including 752 health-based. 1089 of 1583 ZIP codes have at least one violation.

What plumbing code does Illinois follow?

Illinois follows the State-specific plumbing code. A licensed plumber is generally required for plumbing work.

Is lead a concern in Illinois's drinking water?

97 ZIP codes in Illinois have lead levels exceeding the EPA action level of 0.015 mg/L.

What is the radon risk in Illinois?

50% of ZIP codes in Illinois fall in EPA Radon Zone 1 (highest risk).

How to cite this page

APA ZipCheckup. (2026). Illinois Water: 7.4K Violations - 1583 ZIPs. https://zipcheckup.com/states/illinois/
BibTeX 
@misc{zipcheckup-states-illinois,
  author = {{ZipCheckup}},
  title  = {{Illinois Water: 7.4K Violations - 1583 ZIPs}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/illinois/}
}

Data as of July 2026.

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