Public water system · OR4100452

Active

Lafayette, City of

At a glance

City of Lafayette (PWSID OR4100452) is an active community water system in Yamhill County, Oregon. It reports serving 4,423 people through 1,499 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in June 2025.

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

Population served

4,423

Service connections

1,499

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDOR4100452

System typeCommunity water system

Activity statusActive

Population served4,423

Service connections1,499

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyOR state drinking water program

City served—

StateOregon

ZIP—

CountyYamhill County

How does City of Lafayette compare with other water systems in Yamhill County?

By EPA's size categories, City of Lafayette is a medium system (3,301 to 10,000 people). Yamhill County has 91 active public water systems, and City of Lafayette is the 4th-largest of them by population served. Its population served is about 4.4 times the county average of 998 people per system, and accounts for 4.9% of the 90,787 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 Lafayette is about 34% below 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 105 Oregon systems (4.1%) list purchased surface water as their primary source.

Who owns and regulates City of Lafayette?

EPA lists City of Lafayette 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 91 active systems in Yamhill County (19%) are also owned by a local government.

Does City of Lafayette have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in June 2025. The violations listed here began between January 2019 and June 2025. By type: 8 monitoring and reporting, 2 contaminant level above the legal limit, 1 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Groundwater Rule (4 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
2025-06-01	Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31	Groundwater Rulecode 0700	No	Resolved
2025-01-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2023-10-01	Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31	Groundwater Rulecode 0700	No	Resolved
2023-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2023-07-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2023-06-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2022-08-01	Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31	Groundwater Rulecode 0700	No	Resolved
2022-07-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2022-04-01	Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31	Groundwater Rulecode 0700	No	Resolved
2022-01-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	No	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	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 Lafayette: frequently asked questions

Who runs City of Lafayette?

City of Lafayette (PWSID OR4100452) 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 Lafayette serve?

City of Lafayette reports serving 4,423 people through 1,499 service connections in Yamhill County, Oregon.

Where does City of Lafayette get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does City of Lafayette have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in June 2025. 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 Lafayette's 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, 2 are health-based, and the most recent began in June 2025. 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 Lafayette's water quality report?

As a community water system, City of Lafayette 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 Yamhill County

Water system	County	Population served	Type	Source
Mcminnville Water & Light	Yamhill	34,515	Community	Surface water
Newberg, City of	Yamhill	25,138	Community	Groundwater
Sheridan, City of	Yamhill	6,494	Community	Surface water
Dundee, City of	Yamhill	2,960	Community	Groundwater
Dayton, City of	Yamhill	2,535	Community	Groundwater
Carlton, City of	Yamhill	2,270	Community	Surface water

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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, “Lafayette, City of, PWSID OR4100452, Oregon”, https://aquacensus.com/water-systems/oregon/lafayette-city-of-or4100452 (data as of October 1, 2026).