Snohomish County, Washington — public water systems

168 active public water systems serve Snohomish County, reporting 1M people served.

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

Active systems

168

Population served

Community systems

118

Groundwater share

73.2%

Water systems in Snohomish County

Active public water systems in Snohomish County, Washington
#	Water system	County	Population served	Type	Source
1	Alderwood Water District	Snohomish	245,715	Community	Purchased surface water
2	Everett Public Works Dept. City of	Snohomish	215,774	Community	Surface water
3	Marysville Utilities	Snohomish	88,582	Community	Purchased surface water
4	Lynnwood City of	Snohomish	68,204	Community	Purchased surface water
5	Sno PUD 1 - Lake Stevens	Snohomish	67,710	Community	Purchased surface water
6	Silver Lake Water & Sewer District	Snohomish	65,033	Community	Purchased surface water
7	Edmonds City of	Snohomish	34,065	Community	Purchased surface water
8	Mukilteo Water & Wastewater Distr	Snohomish	31,437	Community	Purchased surface water
9	Mountlake Terrace City of	Snohomish	26,402	Community	Purchased surface water
10	Cross Valley Water District	Snohomish	24,695	Community	Purchased surface water
11	Monroe Water System	Snohomish	23,467	Community	Purchased surface water
12	Arlington City of	Snohomish	20,418	Community	Purchased surface water
13	Olympic View Water & Sewer District	Snohomish	16,403	Community	Surface water
14	Stanwood Water Dept City of	Snohomish	13,785	Community	Groundwater
15	Snohomish City of	Snohomish	11,258	Community	Purchased surface water
16	Sultan Water Department	Snohomish	7,160	Community	Surface water
17	Granite Falls City of	Snohomish	6,926	Community	Purchased surface water
18	Seven Lakes Water Association	Snohomish	5,823	Community	Groundwater
19	Roosevelt Water Association	Snohomish	3,530	Community	Purchased surface water
20	Highland Water District	Snohomish	3,121	Community	Purchased surface water
21	Sno PUD 1 - Warm Beach	Snohomish	2,977	Community	Groundwater
22	Gold Bar City of	Snohomish	2,745	Community	Groundwater
23	Darrington Town of	Snohomish	2,246	Community	Groundwater
24	Three Lakes Water Association	Snohomish	2,198	Community	Purchased surface water
25	Sno PUD 1 - May Creek	Snohomish	1,374	Community	Groundwater
26	Warm Beach Conference Grounds	Snohomish	1,190	Community	Groundwater
27	Kayak Point County Park	Snohomish	978	Transient non-community	Groundwater
28	Whitehorse Mercantile Water System	Snohomish	930	Transient non-community	Groundwater
29	Sno PUD 1 - Storm Lake Ridge	Snohomish	786	Community	Purchased surface water
30	Wallace Falls State Park	Snohomish	759	Transient non-community	Purchased groundwater
31	Wilderness Ridge Community Club	Snohomish	664	Community	Groundwater
32	Startup Water District	Snohomish	643	Community	Groundwater
33	Priest Point Beach Water Inc.	Snohomish	624	Community	Groundwater
34	Rivershore Water District #1	Snohomish	572	Transient non-community	Purchased surface water
35	Sno PUD 1 - Sunday Lake	Snohomish	561	Community	Groundwater
36	Zekes Drive-in	Snohomish	502	Transient non-community	Groundwater
37	Lake Alyson	Snohomish	463	Community	Groundwater
38	Wilkshire Lane Water District Inc.	Snohomish	460	Community	Purchased surface water
39	Wandering Creek Homeowners Assoc	Snohomish	457	Community	Purchased surface water
40	Craven Farm Water System	Snohomish	431	Transient non-community	Groundwater
41	Index Water Dept	Snohomish	420	Community	Groundwater
42	Big Bend Landowners Association	Snohomish	419	Community	Groundwater
43	Sno PUD 1 - Skylite Tracts	Snohomish	415	Community	Groundwater
44	Tatoosh Water Company	Snohomish	387	Community	Groundwater
45	Hat Island Community Inc.	Snohomish	348	Community	Surface water
46	Sultan Estates Water System	Snohomish	340	Community	Purchased surface water
47	Kackman Creek	Snohomish	330	Community	Groundwater
48	Machias Ridge Homeowners Assoc.	Snohomish	324	Community	Purchased surface water
49	Cedar Springs Camp	Snohomish	308	Community	Groundwater
50	Donnas Mini Market Water System	Snohomish	300	Transient non-community	Groundwater