Public water system · OR4101139

Active

Midland Water Association

At a glance

Midland Water Association (PWSID OR4101139) is an active community water system in Columbia County, Oregon. It reports serving 160 people through 72 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, 9 are health-based, and the most recent began in March 2026.

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

Population served

160

Service connections

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDOR4101139

System typeCommunity water system

Activity statusActive

Population served160

Service connections72

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyOR state drinking water program

City served—

StateOregon

ZIP—

CountyColumbia County

How does Midland Water Association compare with other water systems in Columbia County?

By EPA's size categories, Midland Water Association is a very small system (500 people or fewer). Columbia County has 57 active public water systems. Its population served is well below the county average of 705 people per system, and accounts for 0.4% of the 40,191 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 Midland Water Association is well 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. 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 Midland Water Association?

EPA lists Midland Water Association 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. 13 of the 57 active systems in Columbia County (23%) are also owned by a local government.

Does Midland Water Association have drinking water violations?

Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in March 2026. The violations listed here began between November 2024 and March 2026. By type: 9 required treatment not met, 2 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (9 of them). EPA lists 7 as resolved, 4 as archived and 1 as unaddressed. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2026-03-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Archived
2025-12-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Archived
2025-11-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Archived
2025-10-31	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2025-10-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Archived
2025-08-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2025-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2025-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2025-05-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2025-02-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2024-12-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	Yes	Resolved
2024-11-01	Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44	Interim Enhanced Surface Water Treatment Rulecode 0300	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.

Midland Water Association: frequently asked questions

Who runs Midland Water Association?

Midland Water Association (PWSID OR4101139) is a community water system owned by a local government. It is regulated by the OR state drinking water program.

How many people does Midland Water Association serve?

Midland Water Association reports serving 160 people through 72 service connections in Columbia County, Oregon.

Where does Midland Water Association 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 Midland Water Association have any drinking water violations?

Of the 12 most recent violations in EPA's records, 9 are health-based, and the most recent began in March 2026. 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 Midland Water Association'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, 9 are health-based, and the most recent began in March 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.

Where can I find Midland Water Association's water quality report?

As a community water system, Midland Water Association 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 Columbia County

Water system	County	Population served	Type	Source
St Helens, City of	Columbia	13,410	Community	Groundwater under influence of surface water
Scappoose, City of	Columbia	8,710	Community	Surface water
Mcnulty Water PUD	Columbia	2,500	Community	Groundwater
Clatskanie, City of	Columbia	2,188	Community	Surface water
Vernonia, City of	Columbia	2,100	Community	Surface water
Warren Water Association	Columbia	2,050	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, “Midland Water Association, PWSID OR4101139, Oregon”, https://aquacensus.com/water-systems/oregon/midland-water-association-or4101139 (data as of October 1, 2026).