Washington County, Oregon — public water systems

97 active public water systems serve Washington County, reporting 597.3K people served.

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

Active systems

Population served

597.3K

Community systems

Groundwater share

80.4%

Water systems in Washington County

Active public water systems in Washington County, Oregon
#	Water system	County	Population served	Type	Source
1	Tualatin Valley Water District	Washington	224,600	Community	Purchased surface water
2	Hillsboro, City of	Washington	92,632	Community	Purchased surface water
3	Beaverton, City of	Washington	88,045	Community	Purchased surface water
4	Tigard, City of	Washington	62,500	Community	Purchased surface water
5	Tualatin, City of	Washington	28,106	Community	Purchased surface water
6	Forest Grove, City of	Washington	26,838	Community	Surface water
7	Sherwood, City of	Washington	19,885	Community	Purchased surface water
8	Cornelius, City of	Washington	14,490	Community	Purchased surface water
9	West Slope Water District	Washington	11,000	Community	Purchased surface water
10	Raleigh Water District	Washington	4,500	Community	Purchased surface water
11	North Plains Water Department	Washington	3,663	Community	Purchased surface water
12	La Water Co-Op	Washington	2,500	Community	Purchased surface water
13	Banks Water Department	Washington	2,070	Community	Surface water
14	Hillsboro-Cherry Grove	Washington	1,628	Community	Surface water
15	Oprd Ll Stub Stewart St Pk	Washington	1,206	Transient non-community	Groundwater
16	Als Garden Centers & Greenhouses	Washington	874	Transient non-community	Groundwater
17	Washington Co Pks - Hagg Lake	Washington	800	Transient non-community	Groundwater
18	Gaston, City of	Washington	625	Community	Purchased surface water
19	Gales Creek Shell & Grocery	Washington	600	Transient non-community	Groundwater
20	Meriwether Natl Golf Course	Washington	516	Transient non-community	Groundwater
21	North Plains Arco	Washington	500	Transient non-community	Groundwater
22	Fir Grove Homeowners Assn	Washington	450	Community	Purchased surface water
23	Visitation Church and School	Washington	450	Non-transient non-community	Groundwater
24	Vadis Camp	Washington	425	Transient non-community	Groundwater
25	Star Satellite Improv Dist	Washington	400	Community	Groundwater
26	Gales Creek Camp	Washington	360	Transient non-community	Groundwater
27	West Union Elem Sd 1	Washington	350	Non-transient non-community	Groundwater
28	Farmington View Elem Sd 1j	Washington	340	Non-transient non-community	Groundwater
29	Reserve Vineyards & Golf Club	Washington	300	Non-transient non-community	Groundwater
30	Camp Mountaindale	Washington	300	Transient non-community	Groundwater
31	Tualatin Valley Regional Trng Ctr	Washington	300	Transient non-community	Groundwater
32	Usfws Tualatin River Natl Wlr	Washington	275	Transient non-community	Groundwater
33	Helvetia Tavern Inc.	Washington	250	Transient non-community	Groundwater
34	Groner Elementary Sd 1j	Washington	250	Non-transient non-community	Groundwater
35	South Hills Water System	Washington	250	Community	Groundwater
36	Westview Mobile Estates	Washington	250	Community	Groundwater
37	Snack Jacks Water System	Washington	250	Transient non-community	Groundwater
38	Manning Dairy Queen	Washington	250	Transient non-community	Groundwater
39	Mcmenamins Rock Creek Tavern	Washington	200	Transient non-community	Groundwater
40	Laurelwood Water Users	Washington	200	Community	Groundwater
41	St Francis of Assisi School	Washington	200	Non-transient non-community	Groundwater
42	Sun Outdoors Portland South	Washington	190	Transient non-community	Groundwater
43	Forest Hills Golf Course	Washington	180	Transient non-community	Groundwater
44	Timber Water Association	Washington	180	Community	Surface water
45	Parrett Mountain View Estates	Washington	155	Community	Groundwater
46	Timberline Baptist Church	Washington	150	Non-transient non-community	Groundwater
47	Midway Firehouse Pizza	Washington	137	Transient non-community	Groundwater
48	Laurel Community Church	Washington	110	Transient non-community	Groundwater
49	Tri-County Industrial Park #1	Washington	100	Non-transient non-community	Groundwater
50	Oregon Harvesting Camp 2	Washington	100	Transient non-community	Groundwater