Public water system · IA5751035
ActiveMarion Municipal Water Dept
At a glance
Marion Municipal Water Dept (PWSID IA5751035) is an active community water system in Linn County, Iowa. It reports serving 41,623 people through 15,383 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; 3 are health-based, and the most recent began in January 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
41,623
Service connections
15,383
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Marion Municipal Water Dept compare with other water systems in Linn County?
By EPA's size categories, Marion Municipal Water Dept is a large system (10,001 to 100,000 people). Linn County has 82 active public water systems, and Marion Municipal Water Dept is the 2nd-largest of them by population served. Its population served is about 15 times the county average of 2,739 people per system, and accounts for 19% of the 224,589 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 Marion Municipal Water Dept is about 6.2 times 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 Marion Municipal Water Dept?
EPA lists Marion Municipal Water Dept 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. 23 of the 82 active systems in Linn County (28%) are also owned by a local government.
Does Marion Municipal Water Dept have drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in January 2015. The violations listed here began between September 1995 and January 2015. By type: 4 monitoring and reporting and 3 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 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 |
|---|---|---|---|---|
| 2015-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2012-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2003-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1999-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Marion Municipal Water Dept: frequently asked questions
Who runs Marion Municipal Water Dept?
Marion Municipal Water Dept (PWSID IA5751035) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Marion Municipal Water Dept serve?
Marion Municipal Water Dept reports serving 41,623 people through 15,383 service connections in Linn County, Iowa.
Where does Marion Municipal Water Dept 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 Marion Municipal Water Dept have any drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in January 2015. 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 Marion Municipal Water Dept'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; 3 are health-based, and the most recent began in January 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Marion Municipal Water Dept's water quality report?
As a community water system, Marion Municipal Water Dept 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 Linn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cedar Rapids Water Department | Linn | 142,364 | Community | Groundwater under influence of surface water |
| Hiawatha Water Dept | Linn | 7,183 | Community | Groundwater |
| Mount Vernon Water Supply | Linn | 4,527 | Community | Groundwater |
| Fairfax Water Supply | Linn | 2,828 | Community | Groundwater |
| Center Point Water Supply | Linn | 2,579 | Community | Groundwater |
| Ely Water Supply | Linn | 2,328 | 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, “Marion Municipal Water Dept, PWSID IA5751035, Iowa”, https://aquacensus.com/water-systems/iowa/marion-municipal-water-dept-ia5751035 (data as of October 1, 2026).