How many public water systems are in Oregon?

Oregon has 2,536 active public water systems in EPA SDWIS records, including 940 community water systems. Together they report serving 4M people.

What is the largest water system in Oregon?

Portland Water Bureau is the largest active public water system in Oregon, serving a reported 666,200 people.

Does Oregon rely more on groundwater or surface water?

87.5% of Oregon's active public water systems draw primarily on groundwater and 12.5% on surface water (including purchased supplies).

Oregon public water systems

2,536 active systems regulated under the Safe Drinking Water Act, serving a reported 4M people across 57 counties.

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

Active systems

2,536

Population served

Community systems

940

Groundwater share

87.5%

System types in Oregon

940

Community water system

346

Non-transient non-community water system

1,250

Transient non-community water system

Largest water systems in Oregon

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The largest active public water systems in Oregon by population served
#	Water system	County	Population served	Type	Source
1	Portland Water Bureau	Multnomah	666,200	Community	Surface water
2	Tualatin Valley Water District	Washington	224,600	Community	Purchased surface water
3	Salem Public Works	Marion	199,820	Community	Surface water
4	Eugene Water & Electric Board	Lane	176,000	Community	Surface water
5	Medford Water Commission	Jackson	106,068	Community	Surface water
6	Hillsboro, City of	Washington	92,632	Community	Purchased surface water
7	Beaverton, City of	Washington	88,045	Community	Purchased surface water
8	Bend, City of	Deschutes	77,704	Community	Surface water
9	Gresham, City of	Multnomah	73,932	Community	Purchased surface water
10	Rockwood PUD	Multnomah	65,443	Community	Purchased surface water
11	Tigard, City of	Washington	62,500	Community	Purchased surface water
12	Springfield Utility Board	Lane	62,100	Community	Surface water
13	Corvallis, City of	Benton	61,468	Community	Surface water
14	Albany, City of	Linn	57,997	Community	Surface water
15	Sunrise Water Authority	Clackamas	50,003	Community	Purchased surface water
16	Klamath Falls Water Dept	Klamath	40,475	Community	Groundwater
17	Lake Oswego Municipal Water	Clackamas	40,000	Community	Purchased surface water
18	Keizer, City of	Marion	38,585	Community	Groundwater
19	Redmond Water Department	Deschutes	37,566	Community	Groundwater
20	Grants Pass, City of	Josephine	37,138	Community	Surface water
21	Avion Wc - Greater Avion	Deschutes	35,332	Community	Groundwater
22	Mcminnville Water & Light	Yamhill	34,515	Community	Surface water
23	Coos Bay North Bend Wtr Brd	Coos	34,500	Community	Surface water
24	Oregon City	Clackamas	33,940	Community	Purchased surface water
25	Oak Lodge Water Services	Clackamas	30,000	Community	Purchased surface water

By county

Clackamas241 systems Lane231 systems Jackson200 systems Marion192 systems Linn161 systems Josephine150 systems Deschutes135 systems Klamath106 systems Douglas102 systems Washington97 systems Yamhill91 systems Umatilla66 systems Tillamook63 systems Multnomah58 systems Columbia57 systems Lincoln52 systems Benton51 systems Coos45 systems Wasco44 systems Crook37 systems Curry36 systems Clatsop31 systems Jefferson31 systems Polk29 systems Baker24 systems Hood River22 systems Malheur20 systems Union20 systems Lake19 systems Morrow16 systems Grant15 systems Sherman12 systems Harney11 systems Wallowa9 systems Gilliam6 systems Montgomery6 systems Wheeler5 systems Klickitat3 systems

Shasta2 systems

Tulare2 systems

Skamania2 systems

Mendocino1 systems

San Diego1 systems

Kootenai1 systems

Canyon1 systems

Minidoka1 systems

Allegan1 systems

Roscommon1 systems

McKenzie1 systems

Pottawatomie1 systems

Lawrence1 systems

Mercer1 systems

Ector1 systems

Harris1 systems

Yakima1 systems

Stevens1 systems

Mason1 systems