Public water system · AR0000337

Active

Keo Water Works

At a glance

Keo Water Works (PWSID AR0000337) is an active community water system in Lonoke County, Arkansas. It reports serving 388 people through 155 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in August 2021.

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

Population served

388

Service connections

155

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDAR0000337

System typeCommunity water system

Activity statusActive

Population served388

Service connections155

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyAR state drinking water program

City served—

StateArkansas

ZIP—

CountyLonoke County

How does Keo Water Works compare with other water systems in Lonoke County?

By EPA's size categories, Keo Water Works is a very small system (500 people or fewer). Lonoke County has 12 active public water systems. Its population served is well below the county average of 3,944 people per system, and accounts for 0.8% of the 47,326 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 Keo Water Works 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 461 Arkansas systems (54%) list groundwater as their primary source.

Who owns and regulates Keo Water Works?

EPA lists Keo Water Works 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. 11 of the 12 active systems in Lonoke County (92%) are also owned by a local government.

Does Keo Water Works have drinking water violations?

Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in August 2021. The violations listed here began between June 2020 and August 2021. By type: 5 public notice, recordkeeping or other, 4 required treatment not met, 2 reporting and 1 monitoring and reporting. The contaminant or rule involved most often is Stage 1 Disinfectants and Disinfection Byproducts Rule (4 of them). EPA lists 11 as resolved 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. 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
2021-08-01	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Unaddressed
2020-09-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2020-09-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-08-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2020-08-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-08-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2020-07-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2020-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2020-07-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-06-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2020-06-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2020-06-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	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.

Keo Water Works: frequently asked questions

Who runs Keo Water Works?

Keo Water Works (PWSID AR0000337) is a community water system owned by a local government. It is regulated by the AR state drinking water program.

How many people does Keo Water Works serve?

Keo Water Works reports serving 388 people through 155 service connections in Lonoke County, Arkansas.

Where does Keo Water Works get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Keo Water Works have any drinking water violations?

Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in August 2021. 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 Keo Water Works' 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, 4 are health-based, and the most recent began in August 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the AR state drinking water program.

Where can I find Keo Water Works' water quality report?

As a community water system, Keo Water Works 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 Lonoke County

Water system	County	Population served	Type	Source
Grand Prairie Bayou 2 Pwa	Lonoke	13,519	Community	Purchased surface water
Ward Waterworks	Lonoke	12,579	Community	Purchased surface water
Lonoke Waterworks	Lonoke	4,277	Community	Groundwater
Des Arc Waterworks	Lonoke + 1 more	4,245	Community	Groundwater
Austin Waterworks	Lonoke	3,600	Community	Purchased surface water
Furlow Public Water Authority	Lonoke	3,073	Community	Purchased 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, “Keo Water Works, PWSID AR0000337, Arkansas”, https://aquacensus.com/water-systems/arkansas/keo-water-works-ar0000337 (data as of October 1, 2026).