What does 'people served' mean?

People served refers to the total population that receives water service from the utility. This number represents the estimated number of residents within the utility's service area.

Why are utilities listed by city?

Utilities are listed by their primary city of operation to help users find water services in their local area. Some utilities may serve multiple cities or unincorporated areas within a region.

How can I get more details about a utility?

Click on any utility name or the 'View Profile' button to access the full utility profile page, which includes detailed information, contact details, and compliance data.

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Drinking Water Utilities in Illinois

Q: How many drinking water utilities are in Illinois?

Illinois has 228 drinking water utilities serving more than 10,000 people listed in this directory.

Browse utilities serving more than 10,000 people by location and population served.

Utilities listed

228

Total people served

9,897,955

Largest utility

City of Chicago

2,746,388 people

Coverage

100%

with population data

Illinois has 228 drinking water utilities serving more than 10,000 people in this directory. The largest utility by population served is City of Chicago, serving 2,746,388 people. Utilities are listed with their city location and population served.

People Served:

02,746,388

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Utility Name	City	People Served	Action
City of Chicago	Chicago	2,746,388	View Profile
Aurora	Aurora	200,000	View Profile
Naperville	Naperville	155,156	View Profile
Joliet	Joliet	148,693	View Profile
Rockford	Rockford	147,051	View Profile
IL American - Champaign	Urbana	142,250	View Profile
IL American - East St. Louis	Belleville	139,879	View Profile
IL American-lake Water Company	Woodridge	123,148	View Profile
IL American - Peoria	Peoria	121,478	View Profile
Springfield	Springfield	117,428	View Profile
Elgin	Elgin	113,911	View Profile
Waukegan	Waukegan	87,157	View Profile
Cicero	Cicero	83,000	View Profile
Aqua Illinois - Kankakee	Kankakee	80,275	View Profile
Arlington Heights	Arlington Heights	79,000	View Profile
Bloomington	Bloomington	77,610	View Profile
Decatur	Decatur	76,122	View Profile
Evanston	Evanston	75,570	View Profile
Schaumburg	Schaumburg	74,550	View Profile
IL American-West Suburban	Woodridge	73,978	View Profile
Palatine	Palatine	70,875	View Profile
Skokie	Skokie	62,700	View Profile
Des Plaines	Des Plaines	60,675	View Profile
Orland Park	Orland Park	58,862	View Profile
Berwyn	Berwyn	58,000	View Profile
Tinley Park	Tinley Park	56,703	View Profile
Oak Lawn	Oak Lawn	55,022	View Profile
Oak Park	Oak Park	54,583	View Profile
Wheaton	Wheaton	52,894	View Profile
Hoffman Estates	Hoffman Estates	52,271	View Profile
Romeoville	Romeoville	50,244	View Profile
Downers Grove	Downers Grove	49,057	View Profile
Glenview	Glenview	47,856	View Profile
O Fallon	O'fallon	46,603	View Profile
Elmhurst	Elmhurst	46,387	View Profile
IL American - Alton	Alton	46,127	View Profile
Normal	Normal	45,841	View Profile
De Kalb	Dekalb	45,000	View Profile
Quincy	Quincy	45,000	View Profile
Plainfield	Plainfield	44,762	View Profile
Moline	Moline	44,500	View Profile
Lombard	Lombard	44,476	View Profile
Village of Buffalo Grove	Buffalo Grove	44,128	View Profile
Mount Prospect	Mount Prospect	41,492	View Profile
Bartlett	Bartlett	41,103	View Profile
Crystal Lake	Crystal Lake	40,635	View Profile
Streamwood	Streamwood	39,577	View Profile
Carol Stream	Carol Stream	39,447	View Profile
Wheeling	Wheeling	39,137	View Profile
Rock Island	Rock Island	39,018	View Profile

Showing 1 to 50 of 228 utilities

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Top Drinking Water Utilities in Illinois by Population Served

Frequently Asked Questions

Definitions

People served: Total population supplied with water by the utility system.
Drinking water utility: A public water system that provides potable (safe to drink) water to residential and commercial customers through a distribution network.