Lake County, California — public water systems

115 active public water systems serve Lake County, reporting 73.4K people served.

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

Active systems

115

Population served

73.4K

Community systems

Groundwater share

70.4%

Water systems in Lake County

Active public water systems in Lake County, California
#	Water system	County	Population served	Type	Source
1	Highlands Mutual Water Company	Lake	7,772	Community	Surface water
2	Hidden Valley Lake Csd	Lake	6,235	Community	Groundwater
3	Konocti County Water District	Lake	5,928	Community	Surface water
4	Lakeport, City of	Lake	4,762	Community	Surface water
5	Golden State Water Co.-Clearlake System	Lake	4,644	Community	Surface water
6	Mt. Konocti Mutual Water Company	Lake	4,360	Community	Surface water
7	Kelseyville Co Waterworks District 3	Lake	4,102	Community	Groundwater
8	Lake County Csa 21 - North Lakeport	Lake	4,046	Community	Surface water
9	Cobb Area County Water District	Lake	3,515	Community	Groundwater
10	Nice Mutual Water Company	Lake	2,929	Community	Surface water
11	Clearlake Oaks County Water District	Lake	2,359	Community	Surface water
12	Lucerne Water Co. - Cal Water Service	Lake	2,129	Community	Surface water
13	Lake County Csa 20 - Soda Bay	Lake	2,003	Community	Surface water
14	Callayomi County Water District	Lake	1,598	Community	Groundwater
15	Lake County Csa 2 - Spring Valley	Lake	1,531	Community	Surface water
16	Buckingham Park Water District	Lake	1,521	Community	Surface water
17	Lower Lake County Water District	Lake	1,326	Community	Groundwater
18	Lakeside County Park	Lake	1,000	Transient non-community	Groundwater
19	Upper Lake County Water District	Lake	989	Community	Groundwater
20	Rotten Robbie	Lake	899	Transient non-community	Groundwater
21	Loch Lomond Mutual Water Co	Lake	693	Community	Groundwater
22	Harbor View Mutual Water Company	Lake	550	Community	Surface water
23	Lake County Csa 13 - Kono Tayee	Lake	449	Community	Groundwater
24	Harbin Hot Springs	Lake	401	Non-transient non-community	Groundwater under influence of surface water
25	Lakeport Cinemas	Lake	400	Transient non-community	Groundwater
26	Anderson Springs Csd	Lake	373	Community	Groundwater
27	Huttopia Six Sigma Campground	Lake	370	Transient non-community	Groundwater
28	Cache Creek Vineyards	Lake	310	Transient non-community	Groundwater
29	Glenhaven Mutual Water Company	Lake	300	Community	Groundwater
30	Konocti Shores	Lake	277	Community	Groundwater
31	Cal 20 Village and Meadow Pointe Park	Lake	255	Community	Groundwater
32	Clear Water Mutual Water Company	Lake	252	Community	Surface water
33	Le Trianon Resort	Lake	243	Transient non-community	Groundwater
34	Mandala Water System	Lake	212	Transient non-community	Groundwater
35	Westgate Petroleum	Lake	210	Transient non-community	Groundwater
36	Saratoga Springs Retreat Center	Lake	208	Transient non-community	Groundwater
37	Walnut Cove Mobile Estates	Lake	200	Community	Groundwater
38	Reel in Resort	Lake	200	Transient non-community	Groundwater
39	Jitter Bean Coffee	Lake	160	Transient non-community	Groundwater
40	Konocti Harbor Resort	Lake	155	Transient non-community	Surface water
41	Pier 1900 Homeowner'S Association	Lake	152	Community	Groundwater
42	Bella Lago Mobile Home Park	Lake	152	Community	Groundwater
43	Corinthian Bay Mutual Water Company	Lake	150	Community	Groundwater
44	Lake Pillsbury Resort & Marina Inc.	Lake	150	Transient non-community	Surface water
45	Larsen'S Office Complex	Lake	112	Transient non-community	Groundwater
46	Thomas Water System	Lake	110	Transient non-community	Groundwater
47	Usfs-Sunset Point Campground	Lake	110	Transient non-community	Groundwater
48	Cdf-Konocti Conservation Camp No. 27	Lake	100	Community	Groundwater
49	Lodge at Blue Lakes	Lake	100	Transient non-community	Groundwater
50	Blue Lakes Improvement Club	Lake	90	Community	Groundwater