COUNTY REPORT IL

Cook County, Illinois

219 ZIP codes · Avg score 68/100 · Grade C · Updated 2026-06-03

Water monitoring across Cook County's 219 ZIP codes paints a mid-range picture — solid compliance in some zones, documented concerns in others; most violations on record are concentrated in specific prior years rather than spread evenly across the full compliance history, and the overall county grade has held steady in the middle tier without major shifts in either direction.

How Cook County Compares

Cook County68/100
Illinois avg61/100
National avg68/100

How Cook County Compares

C
County Grade
68/100
Avg Safety Score
219
ZIP Codes
164
Water Systems

Cook County scores 7 points above the Illinois state average (61/100) and 0 points above the national average (68/100).

Data: EPA SDWIS Last verified: 2026-06-03

C
County Grade
68
Avg Safety Score
219
ZIP Codes
Best ZIP: 60179 (83/100)
Lowest ZIP: 60409 (39/100)
$301K
Median Home Value
$1,657
Avg Remediation (55% of home value)

ZIP Code Risk Map

Water Quality Map: Cook County, Illinois

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 11.2 (asthma 9.8%, diabetes 11.8%)

Estimated additional annual cost per homeowner: $2,230, driven primarily by flood

Infrastructure: 0.42% avg pipe failure probability, 56% of ZIPs at high risk

77.6% of homes built before 1978 (lead paint era)

Violation History (2022–2025)

↑ Worsening trend

EPA violation counts by year across Cook County water systems. Health-based shown in red, total in blue.

2022
10 (10 health)
2023
4 (4 health)
2024
110 (110 health)
2025
14 (14 health)

Peak year: 2024 with 110 violations. Past 5 years: 138 total (138 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.

Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.

County Health Indicators vs National Average

Asthma 9.8% (national: 8.9%)
Diabetes 11.8% (national: 10.5%)
Obesity 31.1% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1962
Median Build Year
77.6%
Pre-1978 Housing
42%
Pipe Failure Probability
56%
ZIPs at High Infra Risk
High
Lead Pipe Risk

Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $2,230

Flood $893/yr
Sea Level Rise $400/yr
Energy Code Gap $385/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Housing Age Distribution

2,271,843 housing units in Cook County

Pre-1940 28%
1940–1959 22%
1960–1979 25%
1980–1999 14%
2000+ 11%

Source: U.S. Census Bureau ACS B25034 (Year Structure Built).

Water Safety Affordability

How much it costs to fix water issues relative to home values in Cook County

$301K
Median Home Value
$1,657
Est. Remediation Cost
0.6%
of Home Value
Remediation as % of home value low burden

Remediation costs are relatively manageable for most homeowners in Cook County, representing a small fraction of property value.

Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.

Health Outcomes vs National Average

CDC PLACES data for Cook County residents

Asthma 9.8% (US avg: 8.9%)
Diabetes 11.8% (US avg: 11%)
Obesity 31.1% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water Systems with Most Violations

Top 5 systems in Cook County ranked by EPA violation count.

# Water System Population Violations
1 Chicago 2,746,388 1610
2 Willoway Terrace Mhp 900 1606
3 Blackhawk Estates Llc 1,238 1601
4 Shady Oaks Mhp 912 1596
5 Sunny Acres Mhp 750 1596

164 total water systems serve Cook County.

All ZIP Codes in Cook County

219 ZIP codes tracked in Cook County.

# ZIP Code City Safety Score Grade Violations Home Value
1 60179 Hoffman Estates 83 B 0
2 60192 Hoffman Estates 83 B 0 $414K
3 60301 Oak Park 83 B 0 $230K
4 60302 Oak Park 83 B 0 $451K
5 60303 Oak Park 83 B 0
6 60304 Oak Park 83 B 0 $470K
7 60455 Bridgeview 83 B 0 $234K
8 60482 Worth 83 B 1 $217K
9 60043 Kenilworth 82 B 1 $1410K
10 60202 Evanston 82 B 0 $381K
11 60130 Forest Park 81 B 1 $294K
12 60141 Hines 81 B 2
13 60204 Evanston 81 B 0
14 60208 Evanston 81 B 0
15 60209 Evanston 81 B 0
16 60467 Orland Park 81 B 1 $392K
17 60526 La Grange Park 81 B 0 $428K
18 60006 Arlington Heights 80 B 3
19 60082 Techny 80 B 0
20 60454 Oak Lawn 80 B 3
21 60805 Evergreen Park 80 B 0 $256K
22 60017 Des Plaines 79 B 3
23 60019 Des Plaines 79 B 3
24 60163 Berkeley 79 B 0 $223K
25 60706 Harwood Heights 79 B 0 $348K
26 60169 Hoffman Estates 78 B 0 $292K
27 60458 Justice 78 B 0 $224K
28 60466 Park Forest 78 B 0 $106K
29 60803 Alsip 78 B 1 $201K
30 60201 Evanston 77 B 0 $578K
31 60402 Berwyn 77 B 2 $278K
32 60412 Chicago Heights 77 B 3
33 60712 Lincolnwood 77 B 2 $475K
34 60008 Rolling Meadows 76 B 1 $295K
35 60089 Buffalo Grove 76 B 2 $393K
36 60133 Hanover Park 76 B 1 $261K
37 60162 Hillside 76 B 0 $234K
38 60425 Glenwood 76 B 4 $182K
39 60478 Country Club Hills 76 B 1 $181K
40 60004 Arlington Heights 75 B 3 $415K
41 60005 Arlington Heights 75 B 3 $376K
42 60107 Streamwood 75 B 1 $258K
43 60415 Chicago Ridge 75 B 0 $218K
44 60161 Melrose Park 74 B 14
45 60459 Burbank 74 B 7 (1 health) $259K
46 60461 Olympia Fields 74 B 6 $289K
47 60464 Palos Park 74 B 7 (1 health) $463K
48 60475 Steger 74 B 2 $137K
49 60558 Western Springs 74 B 6 $691K
50 60827 Riverdale 74 B 1 $124K
51 60159 Schaumburg 73 B 5
52 60168 Schaumburg 73 B 5
53 60173 Schaumburg 73 B 5 $311K
54 60194 Schaumburg 73 B 5 $311K
55 60195 Schaumburg 73 B 5 $240K
56 60196 Schaumburg 73 B 5
57 60406 Blue Island 73 B 9 $166K
58 60445 Midlothian 73 B 1 $202K
59 60456 Hometown 73 B 2 $152K
60 60465 Palos Hills 73 B 0 $259K
61 60070 Prospect Heights 72 B 2 $343K
62 60418 Crestwood 72 B 6 $188K
63 60499 Bedford Park 72 B 0
64 60527 Willowbrook 72 B 6 $488K
65 60176 Schiller Park 71 B 1 $276K
66 60462 Orland Park 71 B 1 $330K
67 60601 Chicago 71 B 19 (1 health) $495K
68 60602 Chicago 71 B 19 (1 health) $383K
69 60603 Chicago 71 B 19 (1 health) $608K
70 60604 Chicago 71 B 19 (1 health) $578K
71 60606 Chicago 71 B 19 (1 health) $367K
72 60607 Chicago 71 B 19 (1 health) $494K
73 60608 Chicago 71 B 19 (1 health) $342K
74 60611 Chicago 71 B 19 (1 health) $608K
75 60612 Chicago 71 B 19 (1 health) $332K
76 60613 Chicago 71 B 19 (1 health) $398K
77 60615 Chicago 71 B 19 (1 health) $305K
78 60616 Chicago 71 B 19 (1 health) $387K
79 60621 Chicago 71 B 19 (1 health) $162K
80 60622 Chicago 71 B 19 (1 health) $623K
81 60623 Chicago 71 B 19 (1 health) $221K
82 60632 Chicago 71 B 19 (1 health) $241K
83 60638 Chicago 71 B 19 (1 health) $284K
84 60640 Chicago 71 B 19 (1 health) $363K
85 60642 Chicago 71 B 19 (1 health) $604K
86 60645 Chicago 71 B 19 (1 health) $308K
87 60649 Chicago 71 B 19 (1 health) $200K
88 60653 Chicago 71 B 19 (1 health) $348K
89 60654 Chicago 71 B 19 (1 health) $496K
90 60655 Chicago 71 B 19 (1 health) $303K
91 60656 Chicago 71 B 19 (1 health) $344K
92 60670 Chicago 71 B 19 (1 health)
93 60009 Elk Grove Village 70 B 2
94 60422 Flossmoor 70 B 3 $304K
95 60443 Matteson 70 B 7 $229K
96 60453 Oak Lawn 70 B 3 $268K
97 60457 Hickory Hills 70 B 0 $278K
98 60029 Golf 69 C 0 $958K
99 60452 Oak Forest 69 C 2 $249K
100 60469 Posen 69 C 2 $174K
101 60476 Thornton 69 C 3 $147K
102 60546 Riverside 69 C 1 $378K
103 60804 Cicero 69 C 7 (1 health) $236K
104 60007 Elk Grove Village 68 C 2 $335K
105 60056 Mount Prospect 68 C 4 $376K
106 60090 Wheeling 68 C 0 $244K
107 60171 River Grove 68 C 1 $245K
108 60193 Schaumburg 68 C 5 $318K
109 60290 Chicago 68 C 19 (1 health)
110 60463 Palos Heights 68 C 1 $344K
111 60513 Brookfield 68 C 0 $314K
112 60605 Chicago 68 C 19 (1 health) $496K
113 60661 Chicago 68 C 19 (1 health) $398K
114 60664 Chicago 68 C 19 (1 health)
115 60666 Chicago 68 C 19 (1 health)
116 60668 Chicago 68 C 19 (1 health)
117 60669 Chicago 68 C 19 (1 health)
118 60673 Chicago 68 C 19 (1 health)
119 60674 Chicago 68 C 19 (1 health)
120 60675 Chicago 68 C 19 (1 health)
121 60677 Chicago 68 C 19 (1 health)
122 60678 Chicago 68 C 19 (1 health)
123 60679 Chicago 68 C 19 (1 health)
124 60681 Chicago 68 C 19 (1 health)
125 60682 Chicago 68 C 19 (1 health)
126 60684 Chicago 68 C 19 (1 health)
127 60685 Chicago 68 C 19 (1 health)
128 60686 Chicago 68 C 19 (1 health)
129 60687 Chicago 68 C 19 (1 health)
130 60688 Chicago 68 C 19 (1 health)
131 60689 Chicago 68 C 19 (1 health)
132 60690 Chicago 68 C 19 (1 health)
133 60691 Chicago 68 C 19 (1 health)
134 60693 Chicago 68 C 19 (1 health)
135 60694 Chicago 68 C 19 (1 health)
136 60695 Chicago 68 C 19 (1 health)
137 60696 Chicago 68 C 19 (1 health)
138 60697 Chicago 68 C 19 (1 health)
139 60699 Chicago 68 C 19 (1 health)
140 60534 Lyons 67 C 1 $244K
141 60154 Westchester 66 C 2 $297K
142 60155 Broadview 66 C 6 $241K
143 60165 Stone Park 66 C 2 $218K
144 60473 South Holland 66 C 6 (2 health) $200K
145 60487 Tinley Park 66 C 3 $340K
146 60609 Chicago 66 C 19 (1 health) $252K
147 60610 Chicago 66 C 19 (1 health) $543K
148 60614 Chicago 66 C 19 (1 health) $731K
149 60617 Chicago 66 C 19 (1 health) $168K
150 60618 Chicago 66 C 19 (1 health) $538K
151 60620 Chicago 66 C 19 (1 health) $188K
152 60624 Chicago 66 C 19 (1 health) $223K
153 60626 Chicago 66 C 19 (1 health) $269K
154 60629 Chicago 66 C 19 (1 health) $236K
155 60630 Chicago 66 C 19 (1 health) $363K
156 60631 Chicago 66 C 19 (1 health) $431K
157 60633 Chicago 66 C 19 (1 health) $182K
158 60634 Chicago 66 C 19 (1 health) $334K
159 60636 Chicago 66 C 19 (1 health) $151K
160 60639 Chicago 66 C 19 (1 health) $289K
161 60641 Chicago 66 C 19 (1 health) $373K
162 60643 Chicago 66 C 19 (1 health) $234K
163 60644 Chicago 66 C 19 (1 health) $238K
164 60646 Chicago 66 C 19 (1 health) $494K
165 60647 Chicago 66 C 19 (1 health) $557K
166 60651 Chicago 66 C 19 (1 health) $263K
167 60652 Chicago 66 C 19 (1 health) $235K
168 60657 Chicago 66 C 19 (1 health) $535K
169 60659 Chicago 66 C 19 (1 health) $359K
170 60660 Chicago 66 C 19 (1 health) $288K
171 60091 Wilmette 65 C 1 $800K
172 60018 Des Plaines 64 C 3 $302K
173 60426 Harvey 64 C 3 $89K
174 60472 Robbins 64 C 19 $114K
175 60707 Elmwood Park 64 C 2 $315K
176 60068 Park Ridge 63 C 4 $540K
177 60184 Wayne 63 C 0 $674K
178 60411 Chicago Heights 63 C 3 $148K
179 60480 Willow Springs 63 C 0 $356K
180 60484 University Park 63 C 0 $141K
181 60501 Summit Argo 63 C 0 $227K
182 60525 La Grange 63 C 5 $423K
183 60471 Richton Park 62 C 6 $201K
184 60022 Glencoe 61 C 0 $1345K
185 60477 Tinley Park 61 C 3 $262K
186 60619 Chicago 61 C 19 (1 health) $213K
187 60625 Chicago 61 C 19 (1 health) $397K
188 60628 Chicago 61 C 19 (1 health) $159K
189 60637 Chicago 61 C 19 (1 health) $244K
190 60131 Franklin Park 60 C 6 $262K
191 60153 Maywood 60 C 6 $213K
192 60428 Markham 60 C 7 $119K
193 60016 Des Plaines 59 C 3 $301K
194 60026 Glenview 59 C 5 $663K
195 60104 Bellwood 59 C 4 (1 health) $219K
196 60160 Melrose Park 59 C 14 $265K
197 60164 Melrose Park 59 C 14 $240K
198 60429 Hazel Crest 59 C 2 $181K
199 60093 Winnetka 58 C 0 $1074K
200 60305 River Forest 57 C 2 $677K
201 60491 Homer Glen 55 C 0 $405K
202 60714 Niles 53 D 1 $351K
203 60038 Palatine 50 D 0
204 60053 Morton Grove 50 D 3 $377K
205 60055 Palatine 50 D 0
206 60077 Skokie 50 D 5 $327K
207 60078 Palatine 50 D 0
208 60094 Palatine 50 D 0
209 60095 Palatine 50 D 0
210 60438 Lansing 50 D 5 $169K
211 60025 Glenview 49 D 5 $512K
212 60067 Palatine 48 D 0 $428K
213 60074 Palatine 48 D 0 $308K
214 60076 Skokie 45 D 5 $381K
215 60430 Homewood 45 D 4 $209K
216 60065 Northbrook 44 D 4
217 60062 Northbrook 42 D 4 $626K
218 60419 Dolton 42 D 15 $141K
219 60409 Calumet City 39 F 6 (1 health) $134K

Recommended Buyer Guides for Cook County

While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.

Overview

Cook County in Illinois covers 219 ZIP codes with an average Home Safety Score of C (68/100).

177 of 219 ZIP codes have recorded EPA violations. 91 health-based violations have been documented.

← Back to Illinois water quality report

Data Sources

Updated daily.

Frequently Asked Questions

Is water safe in Cook County?
Cook County receives a grade of C. Some ZIP codes have recorded violations and residents in affected areas may want to test their water.
How many water systems serve Cook County?
Cook County is served by 164 public water systems that supply drinking water to residents across 219 ZIP codes.
What is the biggest environmental risk in Cook County?
The primary environmental risk factor in Cook County is flood. This contributes to an estimated additional annual cost of $2,230 per homeowner.
How old are homes in Cook County?
The median home build year in Cook County is 1962. 77.6% of homes were built before 1978, which means they may contain lead-based paint and older plumbing materials.
How does Cook County compare to Illinois?
Cook County has an average water safety score of 68/100, which is above the Illinois state average of 61/100.

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