Lake County, Illinois — public water systems

266 active public water systems serve Lake County, reporting 649.5K people served.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

266

Population served

649.5K

Community systems

Groundwater share

85.3%

Water systems in Lake County

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Active public water systems in Lake County, Illinois
#	Water system	County	Population served	Type	Source
1	Waukegan	Lake	87,149	Community	Surface water
2	Vernon Hills - Lake Co Pw	Lake	33,207	Community	Purchased surface water
3	Mundelein	Lake	31,500	Community	Purchased surface water
4	Gurnee	Lake	30,193	Community	Purchased surface water
5	Highland Park	Lake	30,176	Community	Surface water
6	Round Lake Beach	Lake	27,200	Community	Purchased surface water
7	Zion	Lake	24,442	Community	Purchased surface water
8	Great Lakes Naval Training Station	Lake	23,000	Community	Surface water
9	Grayslake	Lake	21,248	Community	Purchased surface water
10	Libertyville	Lake	20,500	Community	Purchased surface water
11	Lake Zurich	Lake	19,759	Community	Groundwater
12	Lake Forest	Lake	19,642	Community	Surface water
13	Deerfield	Lake	19,196	Community	Purchased surface water
14	Round Lake	Lake	18,430	Community	Purchased surface water
15	North Chicago	Lake	16,813	Community	Surface water
16	Wauconda	Lake	15,349	Community	Purchased surface water
17	Lindenhurst	Lake	14,500	Community	Purchased surface water
18	Antioch	Lake	14,175	Community	Groundwater
19	Captain James A Lovell Fhcc	Lake	12,100	Non-transient non-community	Purchased surface water
20	Fox Lake	Lake	11,780	Community	Groundwater
21	Barrington	Lake	10,327	Community	Groundwater
22	Lake Villa	Lake	8,829	Community	Purchased surface water
23	Beach Park	Lake	8,710	Community	Purchased surface water
24	Island Lake	Lake	8,066	Community	Groundwater
25	Lincolnshire	Lake	7,940	Community	Purchased surface water
26	Volo	Lake	6,629	Community	Purchased surface water
27	Winthrop Harbor	Lake	6,565	Community	Purchased surface water
28	Lake Bluff	Lake	5,600	Community	Purchased surface water
29	Park City	Lake	5,425	Community	Purchased surface water
30	Highwood	Lake	5,335	Community	Surface water
31	Round Lake Park	Lake	4,900	Community	Purchased surface water
32	Riverwoods	Lake	3,618	Community	Purchased surface water
33	Hainesville	Lake	3,528	Community	Groundwater
34	Aqua Illinois-Hawthorn Woods	Lake	3,065	Community	Groundwater
35	Highland Park Hospital	Lake	2,800	Non-transient non-community	Purchased surface water
36	Lakemoor	Lake	2,720	Community	Groundwater
37	Round Lake Heights	Lake	2,622	Community	Purchased surface water
38	Saddlebrook Farms	Lake	2,558	Community	Groundwater
39	Baxter Health Care/Hanline	Lake	2,500	Non-transient non-community	Groundwater
40	Park City MHP	Lake	2,460	Community	Purchased surface water
41	Lake Barrington Shores Subdivsion	Lake	2,300	Community	Groundwater
42	Aqua Illinois-Rockwell	Lake	1,762	Community	Groundwater
43	Green Oaks	Lake	1,470	Community	Purchased surface water
44	Wynstone Water Company	Lake	1,424	Community	Groundwater
45	Tower Lakes	Lake	1,372	Community	Groundwater
46	Good Shepherd Hospital	Lake	1,290	Non-transient non-community	Groundwater
47	Park Center of Kemper Lakes Aviands	Lake	1,200	Non-transient non-community	Groundwater
48	Woodlawn Middle/Country Meadow Elem	Lake	1,100	Non-transient non-community	Groundwater
49	Bannockburn	Lake	1,013	Community	Purchased surface water
50	Shell Minuteman	Lake	1,000	Transient non-community	Groundwater