Public water system · MN5380331
ActiveSonju Superstore
At a glance
Sonju Superstore (PWSID MN5380331) is an active non-transient non-community water system in Lake County, Minnesota. It reports serving 60 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
60
Service connections
2
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Sonju Superstore compare with other water systems in Lake County?
By EPA's size categories, Sonju Superstore is a very small system (500 people or fewer). Lake County has 94 active public water systems. Its population served is well below the county average of 190 people per system, and accounts for 0.3% of the 17,863 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Sonju Superstore is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Minnesota has 470 active non-transient non-community water systems, 7.3% 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 Sonju Superstore?
EPA lists Sonju Superstore as privately owned. 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. 76 of the 94 active systems in Lake County (81%) are also privately owned.
Does Sonju Superstore have drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in October 2025. The violations listed here began between July 2007 and October 2025. By type: 2 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2009-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 3 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.
Sonju Superstore: frequently asked questions
Who runs Sonju Superstore?
Sonju Superstore (PWSID MN5380331) is a non-transient non-community water system privately owned. It is regulated by the MN state drinking water program.
How many people does Sonju Superstore serve?
Sonju Superstore reports serving 60 people through 2 service connections in Lake County, Minnesota.
Where does Sonju Superstore 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 Sonju Superstore have any drinking water violations?
EPA's records list 3 violations for this system; 2 are health-based, and the most recent began in October 2025. 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 Sonju Superstore'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 3 violations for this system; 2 are health-based, and the most recent began in October 2025. For current results, consult EPA ECHO, or the MN state drinking water program.
Where can I find Sonju Superstore's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Sonju Superstore is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Lake County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Gooseberry Falls State Park | Lake | 4,797 | Transient non-community | Groundwater |
| Two Harbors | Lake | 3,698 | Community | Surface water |
| Silver Bay | Lake | 1,826 | Community | Surface water |
| Baptism River/Tettegouche State Park | Lake | 1,473 | Transient non-community | Groundwater |
| Split Rock Lighthouse Historic Site | Lake | 967 | Transient non-community | Groundwater |
| Betty'S Pies | Lake | 500 | Transient non-community | Purchased surface water |
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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, “Sonju Superstore, PWSID MN5380331, Minnesota”, https://aquacensus.com/water-systems/minnesota/sonju-superstore-mn5380331 (data as of October 1, 2026).