Public water system · IA5343098
ActiveMonticello Water Supply
At a glance
Monticello Water Supply (PWSID IA5343098) is an active community water system in Jones County, Iowa. It reports serving 4,040 people through 1,707 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; 4 are health-based, and the most recent began in May 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,040
Service connections
1,707
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Monticello Water Supply compare with other water systems in Jones County?
By EPA's size categories, Monticello Water Supply is a medium system (3,301 to 10,000 people). Jones County has 37 active public water systems, and Monticello Water Supply is the 2nd-largest of them by population served. Its population served is about 9.3 times the county average of 435 people per system, and accounts for 25% of the 16,079 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 Monticello Water Supply is about 40% 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 Monticello Water Supply?
EPA lists Monticello 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. 10 of the 37 active systems in Jones County (27%) are also owned by a local government.
Does Monticello Water Supply have drinking water violations?
EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in May 2013. The violations listed here began between July 1997 and May 2013. By type: 6 monitoring and reporting, 4 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 10 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2013-05-21 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2013-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2009-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | 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 |
| 2006-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Resolved |
| 2002-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2000-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2000-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2000-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 1997-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | 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.
Monticello Water Supply: frequently asked questions
Who runs Monticello Water Supply?
Monticello Water Supply (PWSID IA5343098) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Monticello Water Supply serve?
Monticello Water Supply reports serving 4,040 people through 1,707 service connections in Jones County, Iowa.
Where does Monticello 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 Monticello Water Supply have any drinking water violations?
EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in May 2013. 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 Monticello 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; 4 are health-based, and the most recent began in May 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Monticello Water Supply's water quality report?
As a community water system, Monticello 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 Jones County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Anamosa Municipal Water Supply | Jones | 4,457 | Community | Groundwater |
| Anamosa State Penitentiary | Jones | 1,230 | Community | Groundwater |
| Caseys General Store (Anamosa) | Jones | 1,215 | Transient non-community | Groundwater |
| Olin Water Supply | Jones | 651 | Community | Groundwater |
| Wyoming Water System | Jones | 523 | Community | Groundwater |
| Shops Above the Wapsi | Jones | 515 | Transient non-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, “Monticello Water Supply, PWSID IA5343098, Iowa”, https://aquacensus.com/water-systems/iowa/monticello-water-supply-ia5343098 (data as of October 1, 2026).