Public water system · AR0000551
ActiveCalion Water Works
At a glance
Calion Water Works (PWSID AR0000551) is an active community water system in Union County, Arkansas. It reports serving 494 people through 258 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in April 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
494
Service connections
258
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Calion Water Works compare with other water systems in Union County?
By EPA's size categories, Calion Water Works is a very small system (500 people or fewer). Union County has 25 active public water systems. Its population served is well below the county average of 1,582 people per system, and accounts for 1.2% of the 39,541 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 Calion 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 Calion Water Works?
EPA lists Calion 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. 13 of the 25 active systems in Union County (52%) are also owned by a local government.
Does Calion Water Works have drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in April 2026. The violations listed here began between August 1992 and April 2026. By type: 3 contaminant level above the legal limit, 2 reporting, 1 required treatment not met and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 4 as resolved, 2 as unaddressed and 1 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-04-30 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Unaddressed |
| 2026-04-30 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2019-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-02-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2014-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1992-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 7 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.
Calion Water Works: frequently asked questions
Who runs Calion Water Works?
Calion Water Works (PWSID AR0000551) is a community water system owned by a local government. It is regulated by the AR state drinking water program.
How many people does Calion Water Works serve?
Calion Water Works reports serving 494 people through 258 service connections in Union County, Arkansas.
Where does Calion 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 Calion Water Works have any drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in April 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 Calion 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. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in April 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the AR state drinking water program.
Where can I find Calion Water Works' water quality report?
As a community water system, Calion 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 Union County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| El Dorado Waterworks | Union | 17,932 | Community | Groundwater |
| Smackover Waterworks | Union | 2,821 | Community | Groundwater |
| Parkers Chapel Public Water | Union | 2,391 | Community | Groundwater |
| Wildwood Water Association | Union | 1,350 | Community | Groundwater |
| Faircrest Water Association | Union | 1,329 | Community | Groundwater |
| Old Union Public Water Authority | Union | 1,200 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Calion Water Works, PWSID AR0000551, Arkansas”, https://aquacensus.com/water-systems/arkansas/calion-water-works-ar0000551 (data as of October 1, 2026).