Lake County, Illinois — public water systems

494 active public water systems serve Lake County, reporting 714.2K people served.

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

Active systems

494

Population served

714.2K

Community systems

102

Groundwater share

90.7%

Water systems in Lake County

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	Wildwood Subdivision - Lake Co Pw	Lake	14,832	Community	Purchased surface water
17	Lindenhurst	Lake	14,500	Community	Purchased surface water
18	Antioch	Lake	14,175	Community	Groundwater
19	Wauconda	Lake	14,084	Community	Purchased surface water
20	Captain James A Lovell Fhcc	Lake	12,100	Non-transient non-community	Purchased surface water
21	Fox Lake	Lake	11,780	Community	Groundwater
22	Barrington	Lake	10,327	Community	Groundwater
23	Lake Villa	Lake	8,829	Community	Purchased surface water
24	Beach Park	Lake	8,710	Community	Purchased surface water
25	Island Lake	Lake	8,066	Community	Groundwater
26	Lincolnshire	Lake	7,940	Community	Purchased surface water
27	Volo	Lake	6,629	Community	Purchased surface water
28	Winthrop Harbor	Lake	6,565	Community	Purchased surface water
29	Grandwood Park Subdivision - Lake Co Pw	Lake	5,751	Community	Purchased surface water
30	Lake Bluff	Lake	5,600	Community	Purchased surface water
31	Park City	Lake	5,425	Community	Purchased surface water
32	Highwood	Lake	5,335	Community	Surface water
33	Round Lake Park	Lake	4,900	Community	Purchased surface water
34	Lcpw - Pekara Subdivision	Lake	3,711	Community	Purchased surface water
35	Riverwoods	Lake	3,618	Community	Purchased surface water
36	Hainesville	Lake	3,528	Community	Groundwater
37	Aqua Illinois-Hawthorn Woods	Lake	3,065	Community	Groundwater
38	Highland Park Hospital	Lake	2,800	Non-transient non-community	Purchased surface water
39	Lakemoor	Lake	2,720	Community	Groundwater
40	Fox Lake Hills Subdivision - Lake Co Pw	Lake	2,628	Community	Purchased surface water
41	Round Lake Heights	Lake	2,622	Community	Purchased surface water
42	Saddlebrook Farms	Lake	2,558	Community	Groundwater
43	Baxter Health Care/Hanline	Lake	2,500	Non-transient non-community	Groundwater
44	Park City MHP	Lake	2,460	Community	Purchased surface water
45	Lake Barrington Shores Subdivsion	Lake	2,300	Community	Groundwater
46	Aqua Illinois-Rockwell	Lake	1,762	Community	Groundwater
47	Lcpw - Brooks Farm Subdivision	Lake	1,563	Community	Groundwater
48	Green Oaks	Lake	1,470	Community	Purchased surface water
49	Wynstone Water Company	Lake	1,424	Community	Groundwater
50	Tower Lakes	Lake	1,372	Community	Groundwater