Public water system · IA4291038
ActiveUnion Water Supply
At a glance
Union Water Supply (PWSID IA4291038) is an active community water system in Hardin County, Iowa. It reports serving 399 people through 212 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, one is health-based, and the most recent began in October 1997.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
399
Service connections
212
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Union Water Supply compare with other water systems in Hardin County?
By EPA's size categories, Union Water Supply is a very small system (500 people or fewer). Hardin County has 22 active public water systems. Its population served is about 37% below the county average of 633 people per system, and accounts for 2.9% of the 13,920 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Union Water Supply 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. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.
Who owns and regulates Union Water Supply?
EPA lists Union Water Supply as owned by a local government. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 22 active systems in Hardin County (55%) are also owned by a local government.
Does Union Water Supply have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 1997. The violations listed here began between December 1990 and October 1997. By type: 11 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 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 |
|---|---|---|---|---|
| 1997-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 1995-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
| 1995-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 1995-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Resolved |
| 1993-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1993-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1992-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Resolved |
| 1992-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Resolved |
| 1990-12-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | 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.
Union Water Supply: frequently asked questions
Who runs Union Water Supply?
Union Water Supply (PWSID IA4291038) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Union Water Supply serve?
Union Water Supply reports serving 399 people through 212 service connections in Hardin County, Iowa.
Where does Union Water Supply 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 Union Water Supply have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 1997. 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 Union Water Supply'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, one is health-based, and the most recent began in October 1997. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Union Water Supply's water quality report?
As a community water system, Union Water Supply 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 Hardin County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Iowa Falls Water Department | Hardin | 5,146 | Community | Groundwater |
| Eldora Water Supply | Hardin | 2,664 | Community | Groundwater |
| Ackley Municipal Water Works | Hardin | 1,599 | Community | Groundwater |
| Hubbard Water Supply | Hardin | 860 | Community | Groundwater |
| Alden Water Supply | Hardin | 763 | Community | Groundwater |
| Radcliffe Municipal Water | Hardin | 561 | 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, “Union Water Supply, PWSID IA4291038, Iowa”, https://aquacensus.com/water-systems/iowa/union-water-supply-ia4291038 (data as of October 1, 2026).