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Benton County, Oregon — public water systems

At a glance

51 active public water systems are filed under Benton County, Oregon in EPA's SDWIS records, together reporting 72,904 people served. The largest is City of Corvallis, which reports serving 61,468 people. 15 are community water systems serving people where they live; the other 36 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

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

Active systems

51

Population served

72.9K

Community systems

15

Groundwater share

92.2%

How does Benton County compare with other Oregon counties?

Benton County has the 17th-most active public water systems among the 57 counties listed for active Oregon systems in EPA records; among the 38 with 3 or more systems, the median has 41. Its systems report 72,904 people served in total, the 11th-largest county figure in the state and 1.8% of the statewide total. The average system here reports serving 1,430 people, roughly in line with the Oregon average of 1,587. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Benton County's drinking water come from?

By primary water source, Benton County's active systems draw on groundwater (47, 92%) and surface water (4, 7.8%). Overall, 92% rely mainly on groundwater (including purchased groundwater) and 7.8% on surface water, compared with 88% and 12% across Oregon. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Corvallis, draws primarily on surface water.

What kinds of water systems operate in Benton County?

Benton County's active systems break down as 15 community systems (29%), 15 non-transient non-community systems (29%) and 21 transient non-community systems (41%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (57%), local government (33%), federal government (5.9%) and public/private partnership (3.9%).

The 50 largest water systems in Benton County

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Active public water systems in Benton County, Oregon
#Water systemCountyPopulation servedTypeSource
1Corvallis, City ofBenton61,468CommunitySurface water
2Philomath Public WorksBenton4,670CommunitySurface water
3Adair Village Water SystemBenton875CommunitySurface water
4Monroe, City ofBenton723CommunitySurface water
5Knoll Terrace ParkBenton452CommunityGroundwater
6Vineyard Mountain WaterBenton325CommunityGroundwater
7Lineage LogisticsBenton290Non-transient non-communityGroundwater
8Mt View Elementary Sd 509jBenton250Non-transient non-communityGroundwater
9Plymouth Day UseBenton242Transient non-communityGroundwater
10Kings Valley Charter SchoolBenton215Non-transient non-communityGroundwater
11Blodgett Country StoreBenton210Transient non-communityGroundwater
12Alsea County Service DistrictBenton202CommunityGroundwater
13Childrens Farm Home CampusBenton200Non-transient non-communityGroundwater
14Stahlbush Island FarmsBenton200Non-transient non-communityGroundwater
15Corvallis Waldorf AssociationBenton180Non-transient non-communityGroundwater
16Calvary CorvallisBenton173Non-transient non-communityGroundwater
17Fir View Water CompanyBenton150CommunityGroundwater
18Muddy Creek Charter SchoolBenton125Non-transient non-communityGroundwater
19Columbia Place LLCBenton125CommunityGroundwater
20Cascade View EstatesBenton113CommunityGroundwater
21Plymouth CampgroundBenton104Transient non-communityGroundwater
22City LimitsBenton100Transient non-communityGroundwater
23Suburban Christian ChurchBenton100Non-transient non-communityGroundwater
24Pub, theBenton100Transient non-communityGroundwater
25North Corvallis MHP-Well #1Benton100CommunityGroundwater
26Ridgewood Dist Improv CoBenton90CommunityGroundwater
27Garland NurseryBenton90Transient non-communityGroundwater
28Pioneer Village Water CompanyBenton80CommunityGroundwater
29Blm Alsea Falls CampingBenton75Transient non-communityGroundwater
30Consumers Power Inc.Benton60Non-transient non-communityGroundwater
31Philomath Scout LodgeBenton60Transient non-communityGroundwater
32Beazell Memorial ForestBenton54Transient non-communityGroundwater
33Student Transportation of AmericaBenton53Non-transient non-communityGroundwater
34Hull-Oakes Lumber CompanyBenton51Non-transient non-communityGroundwater
35Gathering Together FarmsBenton50Transient non-communityGroundwater
36Raintree EstatesBenton50CommunityGroundwater
37Little Beavers Preschool #1Benton50Non-transient non-communityGroundwater
38Benton Co Pks Salmonberry CgBenton43Transient non-communityGroundwater
39Bellfountain Country StoreBenton40Transient non-communityGroundwater
40Jackson Creek Water AssociationBenton39CommunityGroundwater
41Tennis West Racquet ClubBenton39Transient non-communityGroundwater
42Blodgett Elementary Sd 17jBenton35Non-transient non-communityGroundwater
43Bellfountain Community ChurchBenton32Transient non-communityGroundwater
44Patrick Lumber CompanyBenton32Non-transient non-communityGroundwater
45Life Community ChurchBenton30Transient non-communityGroundwater
46Alpine TavernBenton30Transient non-communityGroundwater
47Camp Alpine Church of LDSBenton28Transient non-communityGroundwater
48Benton Co Pks Bellfountain PkBenton26Transient non-communityGroundwater
49G3 Sports and FitnessBenton25Transient non-communityGroundwater
50Tunnel Radio of AmericaBenton25Transient non-communityGroundwater

All other water systems in Benton County (1)

The remaining active systems filed under Benton County, largest first, with the population each reports serving.

Benton County water systems: frequently asked questions

How many public water systems are in Benton County, Oregon?

EPA's SDWIS records file 51 active public water systems under Benton County, Oregon: 15 community systems (29%), 15 non-transient non-community systems (29%) and 21 transient non-community systems (41%).

Who supplies drinking water in Benton County, OR?

The largest community water systems filed under Benton County are City of Corvallis (61,468 people served), Philomath Public Works (4,670 people served) and Adair Village Water System (875 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Benton County's drinking water come from groundwater or surface water?

Of the 51 active public water systems in Benton County, 92% draw mainly on groundwater and 7.8% on surface water, counting purchased supplies. The largest system, City of Corvallis, uses surface water.

Where can I find a water quality report for Benton County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 15 community systems are filed under Benton County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Benton County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Oregon water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Benton County, Oregon”, https://aquacensus.com/water-systems/oregon/benton (data as of October 1, 2026).