Public water system · IA2256041
ActiveMarquette Water Supply
At a glance
Marquette Water Supply (PWSID IA2256041) is an active community water system in Clayton County, Iowa. It reports serving 429 people through 300 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; 6 are health-based, and the most recent began in January 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
429
Service connections
300
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Marquette Water Supply compare with other water systems in Clayton County?
By EPA's size categories, Marquette Water Supply is a very small system (500 people or fewer). Clayton County has 45 active public water systems. Its population served is about 44% above the county average of 298 people per system, and accounts for 3.2% of the 13,403 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 Marquette 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 Marquette Water Supply?
EPA lists Marquette 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. 14 of the 45 active systems in Clayton County (31%) are also owned by a local government.
Does Marquette Water Supply have drinking water violations?
EPA's records list 7 violations for this system; 6 are health-based, and the most recent began in January 2016. The violations listed here began between October 1982 and January 2016. By type: 6 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Combined Radium (-226 and -228) (6 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2016-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2015-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2015-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1993-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1986-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1982-10-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
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.
Marquette Water Supply: frequently asked questions
Who runs Marquette Water Supply?
Marquette Water Supply (PWSID IA2256041) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Marquette Water Supply serve?
Marquette Water Supply reports serving 429 people through 300 service connections in Clayton County, Iowa.
Where does Marquette 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 Marquette Water Supply have any drinking water violations?
EPA's records list 7 violations for this system; 6 are health-based, and the most recent began in January 2016. 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 Marquette 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 7 violations for this system; 6 are health-based, and the most recent began in January 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Marquette Water Supply's water quality report?
As a community water system, Marquette 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 Clayton County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Guttenberg Water Utility | Clayton | 1,817 | Community | Groundwater |
| Monona Municipal Water Dept | Clayton | 1,471 | Community | Groundwater |
| Elkader Muni Water Dept | Clayton | 1,219 | Community | Groundwater |
| Strawberry Point Water Supply | Clayton | 1,155 | Community | Groundwater |
| Edgewood Water Supply | Clayton | 939 | Community | Groundwater |
| Garnavillo Water Supply | Clayton | 763 | 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, “Marquette Water Supply, PWSID IA2256041, Iowa”, https://aquacensus.com/water-systems/iowa/marquette-water-supply-ia2256041 (data as of October 1, 2026).