Public water system · IA9677007
ActiveOssian Water Supply
At a glance
Ossian Water Supply (PWSID IA9677007) is an active community water system in Winneshiek County, Iowa. It reports serving 802 people through 430 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
802
Service connections
430
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ossian Water Supply compare with other water systems in Winneshiek County?
By EPA's size categories, Ossian Water Supply is a small system (501 to 3,300 people). Winneshiek County has 43 active public water systems, and Ossian Water Supply is the 3rd-largest of them by population served. Its population served is about 134% above the county average of 343 people per system, and accounts for 5.4% of the 14,733 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 Ossian 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 Ossian Water Supply?
EPA lists Ossian 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. 13 of the 43 active systems in Winneshiek County (30%) are also owned by a local government.
Does Ossian Water Supply have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2018. The violations listed here began between October 2018 and October 2018. By type: 2 monitoring and reporting. The contaminants or rules involved are Di(2-ethylhexyl) phthalate and Di(2-ethylhexyl) adipate. EPA lists 2 as archived. 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 |
|---|---|---|---|---|
| 2018-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) phthalatecode 2039 | No | Archived |
| 2018-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Archived |
All 2 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.
Ossian Water Supply: frequently asked questions
Who runs Ossian Water Supply?
Ossian Water Supply (PWSID IA9677007) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Ossian Water Supply serve?
Ossian Water Supply reports serving 802 people through 430 service connections in Winneshiek County, Iowa.
Where does Ossian 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 Ossian Water Supply have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in October 2018. 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 Ossian 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 2 violations for this system; none is health-based, and the most recent began in October 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Ossian Water Supply's water quality report?
As a community water system, Ossian 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 Winneshiek County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Decorah Water Department | Winneshiek | 7,615 | Community | Groundwater |
| Calmar Water Supply | Winneshiek | 1,125 | Community | Groundwater |
| Freeport Water District | Winneshiek | 775 | Community | Groundwater |
| The Country Express | Winneshiek | 515 | Transient non-community | Groundwater |
| Turkey Valley Community School | Winneshiek | 490 | Non-transient non-community | Groundwater |
| Spillville Water Supply | Winneshiek | 371 | 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, “Ossian Water Supply, PWSID IA9677007, Iowa”, https://aquacensus.com/water-systems/iowa/ossian-water-supply-ia9677007 (data as of October 1, 2026).