Public water system · IA1340001
ActiveKnierim Water Supply
At a glance
Knierim Water Supply (PWSID IA1340001) is an active community water system in Calhoun County, Iowa. It reports serving 53 people through 30 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in August 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
53
Service connections
30
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Knierim Water Supply compare with other water systems in Calhoun County?
By EPA's size categories, Knierim Water Supply is a very small system (500 people or fewer). Calhoun County has 14 active public water systems. Its population served is well below the county average of 572 people per system, and accounts for 0.7% 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 Knierim 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 Knierim Water Supply?
EPA lists Knierim 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 Knierim Water Supply have drinking water violations?
EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in August 2024. The violations listed here began between April 1987 and August 2024. By type: 9 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Nitrite (8 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2024-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2024-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2023-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2022-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2020-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2020-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2019-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitritecode 1041 | Yes | Resolved |
| 2006-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) phthalatecode 2039 | No | Resolved |
| 1987-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
All 11 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.
Knierim Water Supply: frequently asked questions
Who runs Knierim Water Supply?
Knierim Water Supply (PWSID IA1340001) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Knierim Water Supply serve?
Knierim Water Supply reports serving 53 people through 30 service connections in Calhoun County, Iowa.
Where does Knierim 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 Knierim Water Supply have any drinking water violations?
EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in August 2024. 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 Knierim 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 11 violations for this system; 9 are health-based, and the most recent began in August 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Knierim Water Supply's water quality report?
As a community water system, Knierim 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 |
| Pomeroy Water Supply | Calhoun | 671 | Community | Groundwater |
| Lohrville Water Supply | Calhoun | 381 | Community | Groundwater |
| Farnhamville Water Supply | Calhoun | 379 | 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, “Knierim Water Supply, PWSID IA1340001, Iowa”, https://aquacensus.com/water-systems/iowa/knierim-water-supply-ia1340001 (data as of October 1, 2026).