Public water system · IA1363051
ActivePomeroy Water Supply
At a glance
Pomeroy Water Supply (PWSID IA1363051) is an active community water system in Calhoun County, Iowa. It reports serving 671 people through 295 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
671
Service connections
295
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Pomeroy Water Supply compare with other water systems in Calhoun County?
By EPA's size categories, Pomeroy Water Supply is a small system (501 to 3,300 people). Calhoun County has 14 active public water systems, and Pomeroy Water Supply is the 4th-largest of them by population served. Its population served is about 17% above the county average of 572 people per system, and accounts for 8.4% of the 8,014 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 Pomeroy 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 Pomeroy Water Supply?
EPA lists Pomeroy 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 14 active systems in Calhoun County (86%) are also owned by a local government.
Does Pomeroy Water Supply have drinking water violations?
EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between October 2006 and July 2025. By type: 5 monitoring and reporting, 2 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrite (2 of them). EPA lists 8 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 |
|---|---|---|---|---|
| 2025-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2025-05-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
| 2016-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2006-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 8 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.
Pomeroy Water Supply: frequently asked questions
Who runs Pomeroy Water Supply?
Pomeroy Water Supply (PWSID IA1363051) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Pomeroy Water Supply serve?
Pomeroy Water Supply reports serving 671 people through 295 service connections in Calhoun County, Iowa.
Where does Pomeroy 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 Pomeroy Water Supply have any drinking water violations?
EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in July 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 Pomeroy 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. EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Pomeroy Water Supply's water quality report?
As a community water system, Pomeroy 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 Calhoun County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rockwell City Water Supply | Calhoun | 2,250 | Community | Groundwater |
| Lake City Water Supply | Calhoun | 1,731 | Community | Groundwater |
| Manson Water Supply | Calhoun | 1,709 | Community | Groundwater |
| Lohrville Water Supply | Calhoun | 381 | Community | Groundwater |
| Farnhamville Water Supply | Calhoun | 379 | Community | Groundwater |
| Twin Lakes Utilities | Calhoun | 300 | Community | Purchased 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, “Pomeroy Water Supply, PWSID IA1363051, Iowa”, https://aquacensus.com/water-systems/iowa/pomeroy-water-supply-ia1363051 (data as of October 1, 2026).