Columbia County, Oregon — public water systems

55 active public water systems serve Columbia County, reporting 40.1K people served.

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

Active systems

Population served

40.1K

Community systems

Groundwater share

83.6%

Water systems in Columbia County

Active public water systems in Columbia County, Oregon
#	Water system	County	Population served	Type	Source
1	St Helens, City of	Columbia	13,410	Community	Groundwater under influence of surface water
2	Scappoose, City of	Columbia	8,710	Community	Surface water
3	Mcnulty Water PUD	Columbia	2,500	Community	Groundwater
4	Clatskanie, City of	Columbia	2,188	Community	Surface water
5	Vernonia, City of	Columbia	2,100	Community	Surface water
6	Warren Water Association	Columbia	2,050	Community	Groundwater
7	Columbia City Mun Waterworks	Columbia	1,995	Community	Groundwater
8	City of Rainier	Columbia	1,932	Community	Surface water
9	Rainier Sd #13	Columbia	950	Non-transient non-community	Groundwater
10	Western Hills Mh Estates	Columbia	375	Community	Groundwater
11	Fishhawk Lake Reserve and Community	Columbia	350	Community	Surface water
12	Quincy Water Association	Columbia	300	Community	Groundwater
13	Columbia Co Pks-Hudson/Parcher	Columbia	200	Transient non-community	Groundwater
14	Columbia Co Pks-Camp Wilkerson	Columbia	200	Transient non-community	Groundwater
15	Midland Water Association	Columbia	160	Community	Surface water
16	Rainier Or Lds Church	Columbia	150	Transient non-community	Groundwater
17	Columbia Co Pks-Big Eddy	Columbia	125	Transient non-community	Groundwater
18	Columbia Acres Water Assoc	Columbia	110	Community	Groundwater
19	Lost Creek Heights Wtr Assoc	Columbia	100	Community	Groundwater
20	Scappoose Brew & Thru	Columbia	100	Transient non-community	Groundwater
21	Deer Island Village MHP	Columbia	100	Community	Groundwater
22	Alston Corners-Assembly of God	Columbia	100	Transient non-community	Groundwater
23	Shell Star Mart	Columbia	100	Transient non-community	Groundwater
24	Rainier Congregation of Jw	Columbia	90	Transient non-community	Groundwater
25	Country Villa Mobile Estates	Columbia	90	Community	Groundwater
26	Deer Island Waterworks	Columbia	90	Community	Groundwater
27	Deer View Cooperative	Columbia	90	Community	Groundwater
28	Paradise Moorage	Columbia	90	Community	Groundwater
29	Goble Water Association	Columbia	85	Community	Groundwater
30	Columbia Hills Hoa	Columbia	84	Community	Groundwater
31	Olympic Forest Products	Columbia	80	Non-transient non-community	Groundwater
32	Tamarack Mobile Home Park	Columbia	80	Community	Groundwater
33	Prescott, City of	Columbia	70	Community	Groundwater
34	Mccuddys Landing	Columbia	70	Community	Groundwater
35	Maple Terrace Mobile Home Park	Columbia	70	Community	Groundwater
36	Laurel Ridge MHP	Columbia	70	Community	Groundwater
37	Marshland Water Association	Columbia	70	Community	Surface water
38	Columbia River Nitrogen, LLC	Columbia	65	Non-transient non-community	Groundwater
39	Deer Island Heights Ws	Columbia	60	Community	Groundwater
40	Cedar Tree Mobile Home Park	Columbia	50	Community	Groundwater
41	Valley of the Moon	Columbia	46	Transient non-community	Groundwater
42	Columbia River PUD	Columbia	45	Non-transient non-community	Groundwater
43	Dikeside Moorage	Columbia	45	Community	Groundwater
44	J & M Mobile Home Park	Columbia	45	Community	Groundwater
45	Berndt Creek Water Corp	Columbia	45	Community	Surface water
46	Island Community LLC	Columbia	41	Transient non-community	Groundwater
47	Hogg Heaven MHP	Columbia	40	Community	Groundwater
48	Swedetown Water Assoc	Columbia	40	Community	Groundwater
49	Pge Beaver Generating Station	Columbia	30	Non-transient non-community	Surface water
50	Mountain View Motel	Columbia	30	Transient non-community	Groundwater