Umatilla County, Oregon — public water systems

66 active public water systems serve Umatilla County, reporting 68.7K people served.

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

Active systems

Population served

68.7K

Community systems

Groundwater share

97%

Water systems in Umatilla County

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Active public water systems in Umatilla County, Oregon
#	Water system	County	Population served	Type	Source
1	Hermiston, City of	Umatilla	20,000	Community	Surface water
2	Pendleton, City of	Umatilla	16,996	Community	Surface water
3	Umatilla, City of	Umatilla	8,256	Community	Groundwater
4	Milton-Freewater, City of	Umatilla	7,145	Community	Groundwater
5	Stanfield, City of	Umatilla	2,115	Community	Groundwater
6	Pilot Rock, City of	Umatilla	1,326	Community	Groundwater
7	Athena, City of	Umatilla	1,238	Community	Groundwater
8	Space Age Fuel	Umatilla	975	Transient non-community	Groundwater
9	Super 7 Mini-Mart	Umatilla	900	Transient non-community	Groundwater
10	Weston, City of	Umatilla	714	Community	Groundwater
11	Echo, City of	Umatilla	632	Community	Groundwater
12	First Stop Mart	Umatilla	550	Transient non-community	Groundwater
13	Lamb Weston	Umatilla	500	Non-transient non-community	Groundwater
14	Ote Deadmans Pass Rest Area	Umatilla	500	Transient non-community	Groundwater
15	Oprd Hat Rock State Park	Umatilla	500	Transient non-community	Groundwater
16	Ote Stanfield Rest Area	Umatilla	450	Transient non-community	Groundwater
17	Adams Water Dept, City of	Umatilla	400	Community	Groundwater
18	One Stop Mart #27	Umatilla	300	Transient non-community	Groundwater
19	Vista Home Park	Umatilla	300	Community	Groundwater
20	Charles Tracts Water Company	Umatilla	290	Community	Groundwater
21	Ferndale Elementary	Umatilla	250	Non-transient non-community	Groundwater
22	Lakeside Foods	Umatilla	250	Non-transient non-community	Groundwater
23	Ukiah, City of	Umatilla	235	Community	Groundwater
24	Oprd Emigrant Springs State Pk	Umatilla	200	Transient non-community	Groundwater
25	Short Stop #1	Umatilla	200	Transient non-community	Groundwater
26	Green Acres MHP - Umatilla Co	Umatilla	200	Community	Groundwater
27	Helix, City of	Umatilla	190	Community	Groundwater
28	Rieth Water District	Umatilla	150	Community	Groundwater
29	Country Squire Estates	Umatilla	150	Community	Groundwater
30	Jj Snack Food Handheld	Umatilla	150	Non-transient non-community	Purchased groundwater
31	One Stop Mart #18	Umatilla	150	Transient non-community	Groundwater
32	Hat Rock Water Company	Umatilla	150	Community	Groundwater
33	Chart Subdivision	Umatilla	125	Community	Groundwater
34	Heritage Improvement District	Umatilla	125	Community	Groundwater
35	Usace Mcnary Dam	Umatilla	120	Non-transient non-community	Groundwater
36	Shady Rest Mobile Court	Umatilla	110	Community	Groundwater
37	Tollgate Crossing	Umatilla	100	Transient non-community	Groundwater
38	North Hill Water Corporation	Umatilla	100	Community	Groundwater
39	Comfort Inn & Suites-Hermiston	Umatilla	100	Transient non-community	Groundwater
40	Clay in Motion	Umatilla	100	Transient non-community	Groundwater
41	Punkin Center School	Umatilla	100	Non-transient non-community	Groundwater
42	Milton-Stateline Sda School	Umatilla	100	Non-transient non-community	Groundwater
43	Columbia Basin Onion	Umatilla	97	Non-transient non-community	Groundwater
44	Vincent Water Company	Umatilla	90	Community	Groundwater
45	Stanfield Hutterian	Umatilla	80	Community	Groundwater
46	Fed Ex - Hermiston	Umatilla	80	Non-transient non-community	Groundwater
47	Mckay Acres Improvement Dist	Umatilla	75	Community	Groundwater
48	Green Meadows Wtr Corporation	Umatilla	75	Community	Groundwater
49	Power City Water Co-Op	Umatilla	70	Community	Groundwater
50	Hat Rock Mobile Court	Umatilla	60	Community	Groundwater