Public water system · OR4100225

Active

Corvallis, City of

At a glance

City of Corvallis (PWSID OR4100225) is an active community water system in Benton County, Oregon. It reports serving 61,468 people through 17,489 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2020.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

61,468

Service connections

17,489

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOR4100225

System typeCommunity water system

Activity statusActive

Population served61,468

Service connections17,489

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyOR state drinking water program

City served—

StateOregon

ZIP—

CountyBenton County

How does City of Corvallis compare with other water systems in Benton County?

By EPA's size categories, City of Corvallis is a large system (10,001 to 100,000 people). Benton County has 51 active public water systems, and City of Corvallis is the largest of them by population served. Its population served is about 43 times the county average of 1,430 people per system, and accounts for 84% of the 72,904 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Corvallis is about 9.2 times that figure.

What does “community water system” mean?

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. Oregon has 940 active community water systems, 37% of the state's 2,536 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 211 Oregon systems (8.3%) list surface water as their primary source.

Who owns and regulates City of Corvallis?

EPA lists City of Corvallis as owned by a local government. The OR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 17 of the 51 active systems in Benton County (33%) are also owned by a local government.

Does City of Corvallis have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2020. The violations listed here began between December 2019 and October 2020. By type: 11 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Surface Water Treatment Rule (6 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2020-10-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2020-10-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2020-10-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2020-10-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2020-10-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2020-10-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2020-07-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2020-07-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2020-06-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2019-12-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2019-12-01	Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38	Interim Enhanced Surface Water Treatment Rulecode 0300	No	Resolved
2019-12-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

City of Corvallis: frequently asked questions

Who runs City of Corvallis?

City of Corvallis (PWSID OR4100225) is a community water system owned by a local government. It is regulated by the OR state drinking water program.

How many people does City of Corvallis serve?

City of Corvallis reports serving 61,468 people through 17,489 service connections in Benton County, Oregon.

Where does City of Corvallis get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does City of Corvallis have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2020. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is City of Corvallis' water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.

Where can I find City of Corvallis' water quality report?

As a community water system, City of Corvallis must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Benton County

Water system	County	Population served	Type	Source
Philomath Public Works	Benton	4,670	Community	Surface water
Adair Village Water System	Benton	875	Community	Surface water
Monroe, City of	Benton	723	Community	Surface water
Knoll Terrace Park	Benton	452	Community	Groundwater
Vineyard Mountain Water	Benton	325	Community	Groundwater
Lineage Logistics	Benton	290	Non-transient non-community	Groundwater

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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, “Corvallis, City of, PWSID OR4100225, Oregon”, https://aquacensus.com/water-systems/oregon/corvallis-city-of-or4100225 (data as of October 1, 2026).