Tap Truth EPA drinking water records, in plain English

County drinking water records

Cook County, IL drinking water systems

145 community water systems serve Cook County, IL, reporting 5,260,647 people served in all. A system that also serves other counties counts all of its customers here.

14 of them (10%) had at least one health-based violation in the last 10 years. 78 systems still have one unresolved.

17 rely mainly on groundwater and 128 on surface water, counting water bought from other systems.

142 systems filed a lead service line inventory listing 289,690 lead lines, 15,646 galvanized lines that must be replaced and 380,202 lines of unknown material.

20 more systems are placed in Cook County, IL by the county their records name because they have no service area map that lines up with their own records, so they are listed apart and not counted here.

Community water systems
145
People served, sum of each system's own figure
5,260,647
Systems with a health-based violation, last 10 years
14
Systems with one unresolved
78
Lead service lines in inventories
289,690

Water systems serving Cook County

145 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Chicago Chicago 2,746,388 Surface water 0 2 150,767
Cicero Cicero 83,000 Purchased surface water 1 3 13,087
Schaumburg Schaumburg 75,750 Purchased surface water 0 0 0
Evanston Evanston 74,486 Surface water 0 0 10,564
Arlington Heights Arlington Heights 73,320 Purchased surface water 0 1 3,912
Palatine Palatine 70,875 Purchased surface water 0 0 261
Skokie Skokie 66,422 Purchased surface water 0 2 4,672
Des Plaines Des Plaines 60,675 Purchased surface water 0 2 11,542
Oak Lawn Oak Lawn 58,362 Purchased surface water 0 1 2,209
Orland Park Orland Park 58,020 Purchased surface water 0 1 1
Berwyn Berwyn 57,250 Purchased surface water 0 0 6,572
Tinley Park Tinley Park 56,703 Purchased surface water 0 2 0
Oak Park Oak Park 54,583 Purchased surface water 0 0 7,034
Hoffman Estates Hoffman Estates and South Barrington 50,179 Purchased surface water 0 0 0
Glenview Glenview 47,856 Purchased surface water 0 0 2,217
Buffalo Grove Buffalo Grove 43,212 Purchased surface water 0 0 0
Bartlett Bartlett 41,500 Purchased surface water 0 0 83
Mount Prospect Mount Prospect 41,000 Purchased surface water 0 1 700
Park Ridge Park Ridge 39,800 Purchased surface water 0 1 2,594
Wheeling Wheeling and Prospect Heights 39,725 Purchased surface water 1 0 0
Streamwood Streamwood 39,577 Purchased surface water 0 0 0
Hanover Park Hanover Park 37,470 Purchased surface water 0 1 0
Calumet City Calumet City 37,000 Purchased surface water 2 2 4,142
Elk Grove Village Elk Grove Village 34,700 Purchased surface water 0 1 0
Northbrook Northbrook 34,407 Surface water 0 0 313
Aqua Illinois-North Maine Utilities Outside cities and towns 30,043 Purchased surface water 0 1 24
South Stickny SD Burbank 30,000 Purchased surface water 0 2 72
Niles Niles 29,350 Purchased surface water 0 1 1,261
Lansing Lansing 29,076 Purchased surface water 0 3 3,002
Oak Forest Oak Forest and Country Club Hills 27,478 Purchased surface water 0 2 5
Wilmette Wilmette 27,087 Surface water 0 1 1,520
Chicago Heights Chicago Heights 26,184 Purchased surface water 0 1 2,486
Morton Grove Morton Grove 25,297 Purchased surface water 0 1 3,108
Elmwood Park Elmwood Park 25,000 Purchased surface water 0 2 638
Harvey Harvey 25,000 Purchased surface water 0 2 0
Melrose Park Melrose Park 24,206 Purchased surface water 0 0 741
Maywood Maywood 24,090 Purchased surface water 1 3 459
Rolling Meadows Rolling Meadows 23,329 Purchased surface water 0 1 0
South Holland South Holland 22,000 Purchased surface water 2 2 1,209
Park Forest Park Forest 21,687 Groundwater 1 0 0
Blue Island Blue Island 21,494 Purchased surface water 0 0 465
Dolton Dolton 20,510 Purchased surface water 0 5 1,817
Evergreen Park Evergreen Park 19,943 Purchased surface water 0 0 6,621
Homewood Homewood and East Hazel Crest 19,463 Purchased surface water 0 1 3,767
Bellwood Bellwood and Melrose Park 19,156 Purchased surface water 1 2 1,144
Alsip Alsip 19,063 Purchased surface water 0 0 0
Brookfield Brookfield 18,776 Purchased surface water 0 0 3,029
Palos Hills Palos Hills 18,530 Purchased surface water 0 0 0
Franklin Park Franklin Park 18,467 Purchased surface water 0 2 1,964
Justice-Willow Springs Water Commission Justice and Willow Springs 18,457 Purchased surface water 0 0 0
Matteson Matteson 18,293 Purchased surface water 0 3 1,295
Lemont Lemont 17,500 Groundwater 1 1 85
Country Club Hills Country Club Hills 16,500 Purchased surface water 0 1 0
Bridgeview Bridgeview 16,467 Purchased surface water 0 0 0
Westchester Westchester 16,241 Purchased surface water 0 1 3,747
La Grange La Grange 16,200 Purchased surface water 0 3 1,542
Palos Heights Palos Heights and Palos Park 15,500 Purchased surface water 0 1 0
Norridge Norridge 15,251 Purchased surface water 0 0 50
Midlothian Midlothian 14,819 Purchased surface water 0 0 538
Hickory Hills Hickory Hills 14,505 Purchased surface water 0 0 0
Forest Park Forest Park 14,340 Purchased surface water 0 1 2,548
Chicago Ridge Chicago Ridge 14,130 Purchased surface water 0 0 No inventory
Lincolnwood Lincolnwood 13,463 Purchased surface water 0 0 1,379
Western Springs Western Springs 13,274 Groundwater 1 1 395
Hazel Crest Hazel Crest 13,098 Purchased surface water 0 1 2,418
La Grange Park La Grange Park 13,011 Purchased surface water 0 0 709
Northlake Northlake and Stone Park 12,840 Purchased surface water 0 0 150
Richton Park Richton Park 12,504 Groundwater 2 4 224
Markham Markham 12,500 Purchased surface water 0 2 1,240
Winnetka Winnetka 12,475 Surface water 0 0 1,373
River Forest Riverside and River Forest 11,717 Purchased surface water 0 2 621
Schiller Park Schiller Park 11,709 Purchased surface water 0 1 189
Burr Ridge Burr Ridge and Willow Springs 11,192 Purchased surface water 0 0 0
IL American-Chicago Suburban Mount Prospect and Prospect Heights 11,187 Purchased surface water 0 0 0
Worth Worth and Alsip 10,970 Purchased surface water 0 0 0
Summit Summit 10,875 Purchased surface water 0 3 1,403
Crestwood Crestwood 10,826 Purchased surface water 0 1 No inventory
Barrington Barrington and Inverness 10,327 Groundwater 0 0 623
Lyons McCook and Lyons 10,304 Purchased surface water 0 1 0
River Grove River Forest and River Grove 10,282 Purchased surface water 0 0 1,725
Riverdale Riverdale 10,266 Purchased surface water 0 1 172
Leyden TWSP Water District Outside cities and towns 10,000 Purchased surface water 0 1 107
Sauk Sauk Village 9,921 Groundwater 0 0 0
Steger Steger 9,700 Groundwater 0 2 613
Flossmoor Flossmoor 9,371 Purchased surface water 0 1 371
Riverside North Riverside and Riverside 9,298 Purchased surface water 0 0 1,408
Lynwood Lynwood 9,149 Purchased surface water 0 0 0
Harwood Heights Harwood Heights 9,065 Purchased surface water 0 0 209
Glenwood Glenwood 8,956 Purchased surface water 0 0 0
Glencoe Glencoe and Forest Park 8,849 Surface water 0 0 528
Calumet Park Calumet Park 8,442 Purchased surface water 0 3 2,241
Hillside Hillside 8,200 Purchased surface water 0 0 485
Broadview Broadview 7,847 Purchased surface water 0 4 957
North Riverside Riverside and North Riverside 7,071 Purchased surface water 0 0 215
Stickney Stickney and Forest View 6,902 Purchased surface water 0 0 70
La Grange Highlands Sanitary District Outside cities and towns 6,600 Purchased surface water 0 1 0
Countryside Countryside and Hodgkins 6,420 Purchased surface water 0 0 No inventory
Northfield Northfield 5,470 Purchased surface water 0 0 85
Robbins Robbins 5,415 Purchased surface water 0 10 1,303
Posen Posen 5,331 Purchased surface water 0 1 1,227
IL American-Fernway Orland Hills 5,223 Purchased surface water 0 0 0
Berkeley Berkeley 5,214 Purchased surface water 0 0 475
Olympia Fields Olympia Fields 4,922 Purchased surface water 0 1 206
Palos Park Palos Park 4,873 Purchased surface water 0 0 0
Stone Park Stone Park 4,576 Purchased surface water 0 1 24
Hometown Hometown 4,240 Purchased surface water 0 1 0
Burnham Burnham 3,989 Purchased surface water 0 3 531
Rosemont Rosemont 3,952 Purchased surface water 0 1 12
South Chicago Heights South Chicago Heights 3,924 Purchased surface water 0 0 159
Indian Head Park Indian Head Park and Countryside 3,240 Purchased surface water 0 1 0
Oasis MHP Outside cities and towns 3,000 Groundwater 0 0 0
Dixmoor Dixmoor 2,973 Purchased surface water 0 4 34
Mission Brook SD Glenview and land outside it 2,852 Purchased surface water 0 1 No inventory
South Palos TWSP Sanitary Dist Palos Park and land outside it 2,800 Purchased surface water 1 1 No inventory
Kenilworth Kenilworth 2,514 Purchased surface water 0 0 370
Central Stickney SD Burbank 2,400 Purchased surface water 1 2 0
Thornton Thornton 2,333 Purchased surface water 0 1 860
Aqua Illinois-Timber Ridge Matteson and land outside it 2,322 Purchased groundwater 0 0 No inventory
Prospect Heights Prospect Heights 2,280 Purchased surface water 0 0 0
Phoenix Phoenix 1,994 Purchased surface water 0 2 310
Merrionette Park Merrionette Park 1,969 Purchased surface water 0 2 0
IL American-Waycinden Des Plaines and Mount Prospect 1,934 Purchased surface water 0 0 0
Ford Heights Outside cities and towns 1,813 Purchased surface water 0 5 10
East Hazel Crest East Hazel Crest 1,500 Purchased surface water 0 0 0
Hodgkins Hodgkins 1,472 Purchased surface water 0 0 0
Garden Home SD Outside cities and towns 1,472 Purchased surface water 0 2 0
Blackhawk Estates LLC Outside cities and towns 1,238 Groundwater 1 1 0
South Barrington South Barrington 1,175 Groundwater 0 1 0
Spring Lakes MHP Bartlett 904 Purchased surface water 0 0 0
Willoway Terrace MHP Outside cities and towns 900 Groundwater 0 0 0
Forest View Forest View 800 Purchased surface water 0 1 260
IL American-Alpine Heights Outside cities and towns 707 Purchased surface water 0 0 0
Bedford Park Bedford Park 602 Purchased surface water 0 0 0
Franciscan Sisters of Chicago Lemont and land outside it 505 Purchased groundwater 0 1 0
Golf Golf 497 Purchased surface water 0 0 29
IL American-Moreland Outside cities and towns 445 Purchased surface water 0 0 163
La Grange Estates MHP La Grange and land outside it 440 Purchased surface water 0 0 0
Candlelight Village MHP Sauk Village 420 Purchased groundwater 0 1 0
Des Plaines MHP Outside cities and towns 405 Groundwater 0 2 No inventory
Linway Estates MHP Outside cities and towns 380 Groundwater 0 1 0
Glen Eden Estates Homeowners Association Outside cities and towns 312 Purchased surface water 1 1 No inventory
Mc Cook McCook 280 Purchased surface water 0 0 0
Aqua Illinois-Summerdale Norridge and land outside it 145 Purchased surface water 0 0 0
IL American-Midwest Palos Outside cities and towns 132 Groundwater 0 0 0
Edward Hines JR V A Hospital Outside cities and towns 60 Purchased surface water 0 0 0

Systems placed by county record in Cook County

20 systems

EPA has no service area map for these systems. They are placed by the county their records name (the counties EPA lists them serving, or the county coded in their IDs where EPA lists none), and without a map they are not counted in the figures above.

System Serves People served Main source Health-based violations, 10 years Unresolved Lead lines
Sterling Estates MHP County on record 1,954 Purchased surface water 0 0 0
Sunset MHP County on record 1,400 Purchased surface water 0 0 0
Alpine Village MHP County on record 994 Purchased surface water 0 0 0
Harbor Point Estates MHP County on record 950 Purchased surface water 0 0 0
Glenbrook SD County on record 822 Purchased surface water 0 0 5
Buckhorn Ranch Estates MHP County on record 702 Purchased surface water 0 0 No inventory
River Oaks Estates MHP County on record 677 Purchased surface water 0 0 No inventory
Paradise MHP County on record 460 Purchased surface water 0 0 0
Oak Lane MHC County on record 388 Purchased surface water 0 0 0
Lindentree Townhomes County on record 232 Groundwater 0 3 No inventory
Weatherstone Lakes MHP County on record 221 Purchased groundwater 0 0 0
Sunrise Senior Living County on record 100 Groundwater 0 0 0
Mid-Mark Water Commission County on record 25 Purchased surface water 0 0 0
Brookfield-North Riverside Water Comm. County on record 1 Purchased surface water 0 0 0
Northwest Water Commission County on record 1 Purchased surface water 0 0 0
Northwest Suburban Municipal Jawa County on record 1 Purchased surface water 0 0 0
Hillside Berkeley Water Commission County on record 1 Purchased surface water 0 0 0
Broadview-Westchester Joint Water Agency County on record 1 Purchased surface water 0 0 0
IL American-Lake Water Company County on record Not reported Purchased surface water 0 0 0
Morton Grove - Niles Water Commission County on record Not reported Purchased surface water 0 0 0

Cities and towns in Cook County

117 places

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Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations