Public water system · AR0000642

Active

Winthrop Water Association

At a glance

Winthrop Water Association (PWSID AR0000642) is an active community water system in Little River County, Arkansas. It reports serving 338 people through 136 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, 7 are health-based, and the most recent began in September 2025.

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

Population served

338

Service connections

136

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDAR0000642

System typeCommunity water system

Activity statusActive

Population served338

Service connections136

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyAR state drinking water program

City served—

StateArkansas

ZIP—

CountyLittle River County

How does Winthrop Water Association compare with other water systems in Little River County?

By EPA's size categories, Winthrop Water Association is a very small system (500 people or fewer). Little River County has 10 active public water systems. Its population served is well below the county average of 1,155 people per system, and accounts for 2.9% of the 11,553 people reported by systems filed under the county. Across Arkansas, the 853 active systems average 3,592 people each. Nationally, the average active community water system reports serving 6,703 people, so Winthrop 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. Arkansas has 660 active community water systems, 77% of the state's 853 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 237 Arkansas systems (28%) list purchased surface water as their primary source.

Who owns and regulates Winthrop Water Association?

EPA lists Winthrop Water Association as owned by a local government. The AR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 10 active systems in Little River County (60%) are also owned by a local government.

Does Winthrop Water Association have drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in September 2025. The violations listed here began between March 2017 and September 2025. By type: 5 contaminant level above the legal limit, 2 monitoring, 2 required treatment not met, 1 reporting, 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (5 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
2025-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-07-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2023-07-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2023-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2018-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2018-06-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2017-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2017-03-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	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.

Winthrop Water Association: frequently asked questions

Who runs Winthrop Water Association?

Winthrop Water Association (PWSID AR0000642) is a community water system owned by a local government. It is regulated by the AR state drinking water program.

How many people does Winthrop Water Association serve?

Winthrop Water Association reports serving 338 people through 136 service connections in Little River County, Arkansas.

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

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in September 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 Winthrop 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, 7 are health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the AR state drinking water program.

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

As a community water system, Winthrop 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 Little River County

Water system	County	Population served	Type	Source
Little River Co Rda	Little River	4,279	Community	Surface water
Ashdown Waterworks	Little River	4,261	Community	Groundwater
Foreman Waterworks	Little River	1,011	Community	Purchased surface water
Millwood Water Corporation	Little River	545	Community	Groundwater
Ogden Waterworks	Little River	495	Community	Groundwater
Wilton Waterworks	Little River	354	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, “Winthrop Water Association, PWSID AR0000642, Arkansas”, https://aquacensus.com/water-systems/arkansas/winthrop-water-association-ar0000642 (data as of October 1, 2026).