Public water system · IA7109065
ActiveCalumet Water Supply
At a glance
Calumet Water Supply (PWSID IA7109065) is an active community water system in O'Brien County, Iowa. It reports serving 146 people through 94 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 1996.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
146
Service connections
94
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Calumet Water Supply compare with other water systems in O'Brien County?
By EPA's size categories, Calumet Water Supply is a very small system (500 people or fewer). O'Brien County has 7 active public water systems. Its population served is well below the county average of 1,597 people per system, and accounts for 1.3% of the 11,182 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 Calumet 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 156 Iowa systems (8.5%) list purchased groundwater as their primary source.
Who owns and regulates Calumet Water Supply?
EPA lists Calumet 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. 7 of the 7 active systems in O'Brien County (100%) are also owned by a local government.
Does Calumet Water Supply have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 1996. The violations listed here began between March 1992 and October 1996. By type: 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 1996-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1992-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 2 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.
Calumet Water Supply: frequently asked questions
Who runs Calumet Water Supply?
Calumet Water Supply (PWSID IA7109065) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Calumet Water Supply serve?
Calumet Water Supply reports serving 146 people through 94 service connections in O'Brien County, Iowa.
Where does Calumet Water Supply get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Calumet Water Supply have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 1996. 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 Calumet 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 2 violations for this system; none is health-based, and the most recent began in October 1996. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Calumet Water Supply's water quality report?
As a community water system, Calumet 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 O'Brien County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sheldon Water Department | O'Brien | 5,512 | Community | Groundwater |
| Hartley Municipal Water Department | O'Brien | 1,605 | Community | Groundwater |
| Sanborn Water Supply | O'Brien | 1,392 | Community | Groundwater |
| Paullina Municipal Water Supply | O'Brien | 996 | Community | Groundwater |
| Primghar Municipal Water Supply | O'Brien | 902 | Community | Groundwater |
| Sutherland Water Supply | O'Brien | 629 | 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, “Calumet Water Supply, PWSID IA7109065, Iowa”, https://aquacensus.com/water-systems/iowa/calumet-water-supply-ia7109065 (data as of October 1, 2026).