Public water system · MN1480003
ActiveOnamia
At a glance
Onamia (PWSID MN1480003) is an active community water system in Mille Lacs County, Minnesota. It reports serving 831 people through 343 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
831
Service connections
343
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Onamia compare with other water systems in Mille Lacs County?
By EPA's size categories, Onamia is a small system (501 to 3,300 people). Mille Lacs County has 91 active public water systems, and Onamia is the 4th-largest of them by population served. Its population served is about 3.8 times the county average of 221 people per system, and accounts for 4.1% of the 20,104 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active community water system reports serving 6,703 people, so Onamia 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. Minnesota has 987 active community water systems, 15% of the state's 6,465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.
Who owns and regulates Onamia?
EPA lists Onamia as owned by a local government. The MN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 9 of the 91 active systems in Mille Lacs County (9.9%) are also owned by a local government.
Does Onamia have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2021. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2021-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
Onamia: frequently asked questions
Who runs Onamia?
Onamia (PWSID MN1480003) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Onamia serve?
Onamia reports serving 831 people through 343 service connections in Mille Lacs County, Minnesota.
Where does Onamia 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 Onamia have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2021. 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 Onamia'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 one violation for this system; it is not health-based, and the most recent began in January 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Onamia's water quality report?
As a community water system, Onamia 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 Mille Lacs County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Princeton | Mille Lacs | 5,421 | Community | Groundwater |
| Milaca | Mille Lacs | 3,043 | Community | Groundwater |
| New Life Christian Center | Mille Lacs | 1,000 | Transient non-community | Groundwater |
| Isle | Mille Lacs | 820 | Community | Groundwater |
| Broberg'S Country Store | Mille Lacs | 500 | Transient non-community | Groundwater |
| Foreston | Mille Lacs | 340 | 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, “Onamia, PWSID MN1480003, Minnesota”, https://aquacensus.com/water-systems/minnesota/onamia-mn1480003 (data as of October 1, 2026).