Public water system · IA4344088
ActiveMissouri Valley Water Supply
At a glance
Missouri Valley Water Supply (PWSID IA4344088) is an active community water system in Harrison County, Iowa. It reports serving 2,678 people through 1,260 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; none is health-based, and the most recent began in June 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,678
Service connections
1,260
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Missouri Valley Water Supply compare with other water systems in Harrison County?
By EPA's size categories, Missouri Valley Water Supply is a small system (501 to 3,300 people). Harrison County has 20 active public water systems, and Missouri Valley Water Supply is the largest of them by population served. Its population served is about 5.3 times the county average of 509 people per system, and accounts for 26% of the 10,181 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 Missouri Valley Water Supply is about 60% 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 Missouri Valley Water Supply?
EPA lists Missouri Valley 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 20 active systems in Harrison County (50%) are also owned by a local government.
Does Missouri Valley Water Supply have drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in June 2024. The violations listed here began between January 1996 and June 2024. By type: 5 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 4 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-06-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-12-09 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Unaddressed |
| 2008-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzenecode 2990 | No | Resolved |
All 5 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.
Missouri Valley Water Supply: frequently asked questions
Who runs Missouri Valley Water Supply?
Missouri Valley Water Supply (PWSID IA4344088) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Missouri Valley Water Supply serve?
Missouri Valley Water Supply reports serving 2,678 people through 1,260 service connections in Harrison County, Iowa.
Where does Missouri Valley 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 Missouri Valley Water Supply have any drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in June 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 Missouri Valley 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 5 violations for this system; none is health-based, and the most recent began in June 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 Missouri Valley Water Supply's water quality report?
As a community water system, Missouri Valley 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 Harrison County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Woodbine Water Department | Harrison | 1,625 | Community | Groundwater |
| Logan Water Supply | Harrison | 1,397 | Community | Groundwater |
| Woodland Camp Property Owners | Harrison | 1,037 | Transient non-community | Groundwater |
| Dunlap Water Supply | Harrison | 1,035 | Community | Groundwater |
| Desoto Natl Wildlife Refuge-Visitor Ctr | Harrison | 505 | Transient non-community | Groundwater |
| Mondamin Water Supply | Harrison | 339 | 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, “Missouri Valley Water Supply, PWSID IA4344088, Iowa”, https://aquacensus.com/water-systems/iowa/missouri-valley-water-supply-ia4344088 (data as of October 1, 2026).